CDC Home
Safer, Healthier People
CDC HomeCDC SearchHealth Topics A-Z
 
  WONDER Home FAQ Help Contact Us Search  
 

Scientific Data Documentation

NHANES III - Laboratory Data File

DSN:  BI00.NHANES3.SASDATA


WARNING!!! WARNING!!! WARNING!!! WARNING!!!

THIS TEXT DOCUMENT IS OVER 200 PAGES LONG!!!!!

DO NOT PRINT THE DOCUMENT UNLESS YOU ARE ABLE
TO PRINT THIS MANY PAGES ON YOUR PRINTER!

YOU ARE ADVISED TO DOWNLOAD THE DOCUMENT TO
YOUR PERSONAL COMPUTER AND THEN VIEW OR
PRINT IT FROM WITHIN A WORD PROCESSOR!!!!
SET YOUR MARGINS TO ZERO AND USE A FONT
THAT MIMICS A TEXT PRINTER.

WARNING!!! WARNING!!! WARNING!!! WARNING!!!

 


          Third National Health and Nutrition Examination Survey
                            (NHANES III), 1988-94
                            Catalog Number 76300



               NHANES III LABORATORY DATA FILE DOCUMENTATION
                          Ages one year and older
                                December 1996



Table of Contents


Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Guidelines for Data Users. . . . . . . . . . . . . . . . . . . . . . . .

Survey Description . . . . . . . . . . . . . . . . . . . . . . . . . . .

Sample Design and Analysis Guidelines. . . . . . . . . . . . . . . . . .

Data Preparation and Processing Procedures . . . . . . . . . . . . . . .

General References . . . . . . . . . . . . . . . . . . . . . . . . . . .

NHANES III Laboratory Data

     General Information . . . . . . . . . . . . . . . . . . . . . . . .

     Data File Index . . . . . . . . . . . . . . . . . . . . . . . . . .

     Data File Item Descriptions, Codes, Counts, and Notes . . . . . . .

     References  . . . . . . . . . . . . . . . . . . . . . . . . . . . .



Introduction

The National Center for Health Statistics (NCHS) of the Centers for Disease
Control and Prevention (CDC) collects, analyzes, and disseminates data on
the health status of U.S. residents.  The results of surveys, analyses, and
studies are made known through a number of data release mechanisms
including publications, mainframe computer data files, CD-ROMs (Search and
Retrieval Software, Statistical Export and Tabulation System (SETS)), and the
Internet (http://www.cdc.gov/nchswww/nchshome.htm).

The National Health and Nutrition Examination Survey (NHANES) is a periodic
survey conducted by NCHS.  The third National Health and Nutrition
Examination Survey (NHANES III), conducted from 1988 through 1994, was the
seventh in a series of these surveys based on a complex, multi-stage sample
plan.  It was designed to provide national estimates of the health and
nutritional status of the United States' civilian, noninstitutionalized
population aged two months and older.

Data from NHANES III are being released in five public release data files:

     NHANES III Household Adult Data File (Catalog Number 77560)

     NHANES III Household Youth Data File (Catalog Number 77550)

     NHANES III Examination Data File (Catalog Number 76200)

     NHANES III Laboratory Data File (Catalog Number 76300)

     NHANES III Dietary Recall Data Files (Catalog Number 76700)



A table showing the location of the interview and examination components in
the five NHANES III public release data files follows.


Location of the interview and examination components in the five NHANES III
public release data files

                                                      Data File


               Topic                     ] HA  ] HY  ] EXAM  ] LAB ] DIET ]
-----------------------------------------+-----+-----+-------+-----+------+
Sample weights                           ]  X  ]  X  ]   .   ]  .  ]   .  ]
-----------------------------------------+-----+-----+-------+-----+------+
Age/race/sex                             ]  X  ]  X  ]   .   ]  .  ]   .  ]
-----------------------------------------+-----+-----+-------+-----+------+
Ethnic background                        ]  X  ]  X  ]   .   ]  .  ]   .  ]
-----------------------------------------+-----+-----+-------+-----+------+
Household composition                    ]  X  ]  X  ]   .   ]  .  ]   .  ]
-----------------------------------------+-----+-----+-------+-----+------+
Individual characteristics               ]  X  ]  X  ]   .   ]  .  ]   .  ]
-----------------------------------------+-----+-----+-------+-----+------+
Health insurance                         ]  X  ]  X  ]   .   ]  .  ]   .  ]
-----------------------------------------+-----+-----+-------+-----+------+
Family background                        ]  X  ]  X  ]   .   ]  .  ]   .  ]
-----------------------------------------+-----+-----+-------+-----+------+
Occupation of family head                ]  X  ]  X  ]   .   ]  .  ]   .  ]
-----------------------------------------+-----+-----+-------+-----+------+
Housing characteristics                  ]  X  ]  X  ]   .   ]  .  ]   .  ]
-----------------------------------------+-----+-----+-------+-----+------+
Family characteristics                   ]  X  ]  X  ]   .   ]  .  ]   .  ]
-----------------------------------------+-----+-----+-------+-----+------+
Orientation                              ]  X  ]  X  ]   .   ]  .  ]   .  ]
-----------------------------------------+-----+-----+-------+-----+------+
Health services                          ]  X  ]  X  ]   .   ]  .  ]   .  ]
-----------------------------------------+-----+-----+-------+-----+------+
Selected health conditions               ]  X  ]  X  ]   X   ]  .  ]   .  ]
-----------------------------------------+-----+-----+-------+-----+------+
Diabetes questions                       ]  X  ]  .  ]   .   ]  .  ]   .  ]
-----------------------------------------+-----+-----+-------+-----+------+
High blood pressure and                  ]  X  ]  .  ]   .   ]  .  ]   .  ]
     cholesterol questions               ]     ]     ]       ]     ]      ]
-----------------------------------------+-----+-----+-------+-----+------+
Cardiovascular disease questions         ]  X  ]  .  ]   .   ]  .  ]   .  ]
-----------------------------------------+-----+-----+-------+-----+------+
Musculoskeletal conditions               ]  X  ]  .  ]   .   ]  .  ]   .  ]
-----------------------------------------+-----+-----+-------+-----+------+
Physical functioning questions           ]  X  ]  .  ]   .   ]  .  ]   .  ]
-----------------------------------------+-----+-----+-------+-----+------+
Gallbladder disease questions            ]  X  ]  .  ]   .   ]  .  ]   .  ]
-----------------------------------------+-----+-----+-------+-----+------+


Location of the interview and examination components in the five NHANES III
public release data files (continued)


                                                     Data File


               Topic                     ] HA  ] HY  ] EXAM  ] LAB ] DIET ]
-----------------------------------------+-----+-----+-------+-----+------+
Kidney conditions                        ]  X  ]  .  ]   .   ]  .  ]   .  ]
-----------------------------------------+-----+-----+-------+-----+------+
Respiratory and allergy questions        ]  X  ]  X  ]   .   ]  .  ]   .  ]
-----------------------------------------+-----+-----+-------+-----+------+
Diet questions                           ]  X  ]  .  ]   .   ]  .  ]   .  ]
-----------------------------------------+-----+-----+-------+-----+------+
Food frequency                           ]  X  ]  .  ]   X   ]  .  ]   .  ]
-----------------------------------------+-----+-----+-------+-----+------+
Vision questions                         ]  X  ]  X  ]   .   ]  .  ]   .  ]
-----------------------------------------+-----+-----+-------+-----+------+
Hearing questions                        ]  X  ]  X  ]   .   ]  .  ]   .  ]
-----------------------------------------+-----+-----+-------+-----+------+
Dental care and status                   ]  X  ]  X  ]   .   ]  .  ]   .  ]
-----------------------------------------+-----+-----+-------+-----+------+
Tobacco                                  ]  X  ]  .  ]   X   ]  .   ]   . ]
-----------------------------------------+-----+-----+-------+-----+------+
Occupation                               ]  X  ]  .  ]   .   ]  .  ]   .  ]
-----------------------------------------+-----+-----+-------+-----+------+
Language usage                           ]  X  ]  X  ]   .   ]  .  ]   .  ]
-----------------------------------------+-----+-----+-------+-----+------+
Exercise                                 ]  X  ]  .  ]   .   ]  .  ]   .  ]
-----------------------------------------+-----+-----+-------+-----+------+
Social support/residence                 ]  X  ]  .  ]   .   ]  .  ]   .  ]
-----------------------------------------+-----+-----+-------+-----+------+
Vitamin/mineral/medicine usage           ]  X  ]  X  ]   X   ]  .  ]   .  ]
-----------------------------------------+-----+-----+-------+-----+------+
Blood pressure measurement               ]  X  ]  .  ]   X   ]  .  ]   .  ]
-----------------------------------------+-----+-----+-------+-----+------+
Birth                                    ]  .  ]  X  ]   X   ]  .  ]   .  ]
-----------------------------------------+-----+-----+-------+-----+------+
Infant feeding practices/diet            ]  .  ]  X  ]   .   ]  .  ]   .  ]
-----------------------------------------+-----+-----+-------+-----+------+
Motor and social development             ]  .  ]  X  ]   .   ]  .  ]   .  ]
-----------------------------------------+-----+-----+-------+-----+------+
Functional impairment                    ]  X  ]  X  ]   .   ]  .  ]   .  ]
-----------------------------------------+-----+-----+-------+-----+------+
School attendance                        ]  .  ]  X  ]   .   ]  .  ]   .  ]
-----------------------------------------+-----+-----+-------+-----+------+
Cognitive function                       ]  .  ]  X  ]   X   ]  .  ]   .  ]
-----------------------------------------+-----+-----+-------+-----+------+


Location of the interview and examination components in the five NHANES III
public release data files (continued)

                                                      Data File


               Topic                     ] HA  ] HY  ] EXAM  ] LAB ] DIET ]
-----------------------------------------+-----+-----+-------+-----+------+
Alcohol and drug use                     ]  .  ]  .  ]   X   ]  .  ]   .  ]
-----------------------------------------+-----+-----+-------+-----+------+
Reproductive health                      ]  .  ]  .  ]   X   ]  .  ]   .  ]
-----------------------------------------+-----+-----+-------+-----+------+
Diagnostic interview schedule            ]  .  ]  .  ]   X   ]  .  ]   .  ]
-----------------------------------------+-----+-----+-------+-----+------+
Activity                                 ]  .  ]  .  ]   X   ]  .  ]   .  ]
-----------------------------------------+-----+-----+-------+-----+------+
Physician's examination                  ]  .  ]  .  ]   X   ]  .  ]   .  ]
-----------------------------------------+-----+-----+-------+-----+------+
Height and weight                        ]  .  ]  .  ]   X   ]  .  ]   .  ]
-----------------------------------------+-----+-----+-------+-----+------+
Body measurements                        ]  .  ]  .  ]   X   ]  .  ]   .  ]
-----------------------------------------+-----+-----+-------+-----+------+
Dental examination                       ]  .  ]  .  ]   X   ]  .  ]   .  ]
-----------------------------------------+-----+-----+-------+-----+------+
Allergy skin test                        ]  .  ]  .  ]   X   ]  .  ]   .  ]
-----------------------------------------+-----+-----+-------+-----+------+
Audiometry                               ]  .  ]  .  ]   X   ]  .  ]   .  ]
-----------------------------------------+-----+-----+-------+-----+------+
Tympanometry                             ]  .  ]  .  ]   X   ]  .  ]   .  ]
-----------------------------------------+-----+-----+-------+-----+------+
WISC and WRAT                            ]  .  ]  .  ]   X   ]  .  ]   .  ]
-----------------------------------------+-----+-----+-------+-----+------+
Spirometry                               ]  .  ]  .  ]   X   ]  .  ]   .  ]
-----------------------------------------+-----+-----+-------+-----+------+
Bone densitometry                        ]  .  ]  .  ]   X   ]  .  ]   .  ]
-----------------------------------------+-----+-----+-------+-----+------+
Gallbladder ultrasonography              ]  .  ]  .  ]   X   ]  .  ]   .  ]
-----------------------------------------+-----+-----+-------+-----+------+
Central nervous system                   ]  .  ]  .  ]   X   ]  .  ]   .  ]
 function evaluation                     ]     ]     ]       ]     ]      ]
-----------------------------------------+-----+-----+-------+-----+------+
Fundus photography                       ]  .  ]  .  ]   X   ]  .  ]   .  ]
-----------------------------------------+-----+-----+-------+-----+------+
Physical function evaluation             ]  .  ]  .  ]   X   ]  .  ]   .  ]
-----------------------------------------+-----+-----+-------+-----+------+
Fasting questions                        ]  .  ]  .  ]   .   ]  X  ]   .  ]
-----------------------------------------+-----+-----+-------+-----+------+


Location of the interview and examination components in the five NHANES III
public release data files (continued)

                                                      Data File


               Topic                     ] HA  ] HY  ] EXAM  ] LAB ] DIET ]
-----------------------------------------+-----+-----+-------+-----+------+
Laboratory tests on blood and urine      ]  .  ]  .  ]   .   ]  X  ]   .  ]
-----------------------------------------+-----+-----+-------+-----+------+
Total nutrient intakes                   ]  .  ]  .  ]   X   ]  .  ]   .  ]
-----------------------------------------+-----+-----+-------+-----+------+
Individual foods                         ]  .  ]  .  ]   .   ]  .  ]   X  ]
-----------------------------------------+-----+-----+-------+-----+------+
Combination foods                        ]  .  ]  .  ]   .   ]  .  ]   X  ]
-----------------------------------------+-----+-----+-------+-----+------+
Ingredients                              ]  .  ]  .  ]   .   ]  .  ]   X  ]
-----------------------------------------+-----+-----+-------+-----+------+


Data File Definitions

HA   -  Household Adult Data File
HY   -  Household Youth Data File
EXAM -  Examination Data File
LAB  -  Laboratory Data File
DIET -  Dietary Recall Data Files


This document includes the documentation for the NHANES III Laboratory Data
File and also contains a general overview of the survey and the use of the
data files.  The general overview includes five sections.  The first
section, entitled "Guidelines for Data Users," contains important information
about the use of the data files.  The second section, "Survey Description,"
is a brief overview of the survey plan and operation.  The third section,
"Sample Design and Analysis Guidelines," describes some technical aspects of
the sampling plan and discusses some analytic issues particularly related to
the use of data from complex sample surveys.  The "Data Preparation and
Processing Procedures" section describes the editing conventions and the
codes used to represent the data.  The last and fifth section, "General
References," includes a reference list for the survey overview sections of
the document.

Public Use Data Files for the third National Health and Nutrition
Examination Survey will also be available from the National Technical
Information Service (NTIS).  A list of NCHS public use data tapes available
for purchase from NTIS may be obtained from the Data Dissemination Branch at
NCHS.  Information regarding a bibliography (on disk) of journal articles
citing data from all the NHANES and the availability of NHANES III data in
CD-ROM/SETS software format can be obtained from the Data Dissemination
Branch(301-436-8500) or by writing to:

Data Dissemination Branch
National Center for Health Statistics
Room 1018
6525 Belcrest Road
Hyattsville, Maryland 20782


NTIS can be contacted at:

NTIS - Computer Products Office
5285 Port Royal Road
Springfield, Virginia 22161
(703) 487-4807

Copies of all NHANES III questionnaires and data collection forms are
included in the Plan and Operation of the Third National Health and
Nutrition Examination Survey, 1988-94 (NCHS, 1994; U.S. DHHS, 1996).  This
publication, along with detailed information on NHANES procedures,
interviewing, data collection, quality control techniques, survey design,
nonresponse, and sample weighting can be found on the NHANES III Reference
Manuals and Reports CD-ROM (U.S. DHHS, 1996).  Information on how to order
this CD-ROM is available from the Data Dissemination Branch at NCHS at the
address and telephone number given above.


GUIDELINES FOR DATA USERS


Please refer to the following important information before analyzing data.


NHANES III Background Documents

o    The Plan and Operation of the Third National Health and Nutrition
     Examination Survey, 1988-94, (NCHS, 1994; U.S. DHHS, 1996) provides an
     overview of the survey and includes copies of the survey forms.

o    The sample design, nonresponse, and analytic guidelines documents on
     the NHANES III Reference Manuals and Reports CD-ROM (U.S. DHHS, 1996)
     discuss the reasons that sample weights and the complex survey design
     should be taken into account when conducting any analysis.

o    Instruction manuals, laboratory procedures, and other NHANES III
     reference manuals on the NHANES III Reference Manuals and Reports
     CD-ROM(U.S. DHHS, 1996) are also available for further information on
     the details of the survey.


Analytic Data Set Preparation

o    Most NHANES III survey design and demographic variables are found only
     on the Adult and Youth Household Data Files.  In preparing a data set
     for analysis, other data files must be merged with either or both of
     these files to obtain many important analytic variables.

o    All of the NHANES III public use data files are linked with the common
     survey participant identification number (SEQN).  Merging information
     from multiple NHANES III data files using this variable ensures that
     the appropriate information for each survey participant is linked
     correctly.

o    NHANES III public use data files do not have the same number of
     records on each file.  The Household Questionnaire Files (divided into
     two files, Adult and Youth) contain more records than the Examination
     Data File because not everyone who was interviewed completed the
     examination. The Laboratory Data File contains data only for persons
     aged one year and older.  The Individual Foods Data File based on the
     dietary recall has multiple records for each person rather than the one
     record per sample person contained in the other data files.

o    For each data file, SAS program code with standard variable names and
     labels is provided as separate text files on the CD-ROM that contains
     the data files.  This SAS program code can be used to create a SAS
     data set from the data file.

o    Modifications were made to items in the questionnaires, laboratory,
     and examination components over the course of the survey; as a result,
     data may not be available for certain variables for the full six years.
     In addition, variables may differ by phase since some changes were
     implemented between phases.  Users are encouraged to read the Notes
     sections of this document carefully for information about changes.

o    Extremely high and low values have been verified whenever possible,
     and numerous consistency checks have been performed.  Nonetheless, users
     should examine the range and frequency of values before analyzing
     data.

o    Some data were not ready for release at the time of this publication
     due to continued processing of the data or analysis of laboratory
     specimens.  A listing of those data are available in the general
     information section of each data file.

o    Confidential and administrative data are not being released to the
     public.  Additionally, some variables have been recoded to help
     protect the confidentiality of the survey participants.  For example,
     all age-related variables were recoded to 90+ years for persons who were
     90 years of age and older.

o    Some variable names may differ from those used in the Phase 1 NHANES
     III Provisional Data Release and some variables included in the Phase 1
     provisional release may not appear on these files.

o    Although the data files have been edited carefully, errors may be
     detected.  Please notify NCHS staff (301-436-8500) of any errors in
     the data file or the documentation.



Analytic Considerations

o    NHANES III (1988-94) was designed so that the survey's first three
     years, 1988-91, its last three years, 1991-94, and the entire six
     years were national probability samples.  Analysts are encouraged to use
     all six years of survey results.

o    Sample weights are available for analyzing NHANES III data.  One of
     the following three sample weights will be appropriate for nearly all
     analyses:  interviewed sample final weight (WTPFQX6), examined sample
     final weight (WTPFEX6), and mobile examination center (MEC)- and
     home-examined sample final weight (WTPFHX6).  Choosing which of these
     sample weights to use in any analysis depends on the variables being
     used.  A good rule of thumb is to use "the least common denominator"
     approach.  In this approach, the user checks the variables of
     interest.  The variable that was collected on the smallest number of
     persons is the "least common denominator," and the sample weight that
     applies to that variable is the appropriate one to use for that
     analysis.  For more detailed information, see the Analytic and Reporting
     Guidelines for NHANES III (U.S. DHHS, 1996).


Referencing or Citing NHANES III Data

o    In publications, please acknowledge NCHS as the original data source.
     For instance, the reference for the NHANES III Laboratory Data File
     is:

     U.S. Department of Health and Human Services (DHHS).  National Center
     for Health Statistics.  Third National Health and Nutrition
     Examination Survey, 1988-1994, NHANES III Laboratory Data File (CD-ROM).
     Public Use Data File Documentation Number 76200.  Hyattsville, MD.:
     Centers for Disease Control and Prevention, 1996.  Available from
     National Technical Information Service (NTIS), Springfield, VA.
     Acrobat.  PDF format; includes access software:  Adobe Systems, Inc.
     Acrobat Reader 2.1.

o    Please place the acronym "NHANES III" in the titles or abstracts of
     journal articles and other publications in order to facilitate the
     retrieval of such materials in bibliographic searches.


SURVEY DESCRIPTION


The third National Health and Nutrition Examination Survey (NHANES III) was
the seventh in a series of large health examination surveys conducted in
the United States beginning in 1960.  Three of these surveys, the National
Health Examination Surveys (NHES), were conducted in the 1960's (NCHS, 1965;
NCHS, 1967; NCHS, 1969).  In 1970, an expanded nutrition component was added
to provide data with which to assess nutritional status and dietary
practices, and the name was changed to the National Health and Nutrition
Examination Survey (Miller, 1973; Engel, 1978; McDowell, 1981).  A special
survey of Hispanic populations in the United States was conducted during
1982-1984 (NCHS, 1985).

The general structure of the NHANES III sample design was similar to that
of the previous NHANES.  All of the surveys used complex, multi-stage,
stratified, clustered samples of civilian, noninstitutionalized
populations.  NHANES III was the first NHANES without an upper age limit; in
fact, the age range for the survey was two months and older.  A home
examination option was employed for the first time in order to obtain
examination data for very young children and for elderly persons who were
unable to visit the mobile examination center (MEC).  The home examination
included only a subset of the components used in the full MEC examination
since it would have been difficult to collect some types of data in a home
setting.  A detailed description of design specifications and copies of the
data collection forms can be found in the Plan and Operation of the Third
National Health and Nutrition Examination Survey, 1988-1994 (NCHS, 1994; U.S.
DHHS, 1996).

NHANES III was conducted from October 1988 through October 1994 in two
phases, each of which comprised a national probability sample.  The first
phase was conducted from October 18, 1988, through October 24, 1991, at 44
locations.  The second phase was conducted from September 20, 1991, through
October 15, 1994, at 45 different locations.  In NHANES III, 39,695 persons
were selected over the six years; of those, 33,994 (86%) were interviewed
in their homes.  All interviewed persons were invited to the MEC for a
medical examination.  Seventy-eight percent (30,818) of the selected persons
were examined in the MEC, and an additional 493 persons were given a special,
limited examination in their homes.

Data collection began with a household interview.  Several questionnaires
were administered in the household:  Household Screener Questionnaire,
Family Questionnaire, Household Adult Questionnaire, and Household Youth
Questionnaire.

At the MEC, an examination was performed, and five automated questionnaires
or interviews were administered:  MEC Adult Questionnaire, MEC Youth
Questionnaire, MEC Proxy Questionnaire, 24-Hour Dietary Recall, and Dietary
Food Frequency (ages 12-16 years).  The health examination component
included a variety of tests and procedures.  The examinee's age at the time
of the interview and other factors determined which procedures were
administered.  Blood and urine specimens were obtained, and a number of tests
and measurements were performed including body measurements, spirometry,
fundus photography, x-rays, electrocardiography, allergy and glucose
tolerance tests, and ultrasonography.  Measurements were taken of bone
density, hearing, and physical, cognitive, and central nervous system
functions.  A physician performed a limited standardized medical examination
and a dentist performed a standardized dental examination.  While some of the
blood and urine analyses were performed in the MEC laboratory, most analyses
were conducted elsewhere by contract laboratories.

A home examination was conducted for those sample persons aged 2-11 months
and aged 20 years or older who were unable to visit the mobile examination
center.  The home examination consisted of an abbreviated version of the
tests and interviews performed in the MEC.  Depending on age of the sample
person, the components included body measurements, blood pressure,
spirometry, venipuncture, physical function evaluation, and a questionnaire
to inquire about infant feeding, selected health conditions, cognitive
function, tobacco use, and reproductive history.


SAMPLE DESIGN AND ANALYSIS GUIDELINES

Sample Design

The general structure of the NHANES III sample design is the same as that
of the previous NHANES.  Each of these surveys used a stratified, multi-stage
probability design.  The major design parameters of the two previous NHANES
and the special Hispanic HANES, as well as NHANES III, have been previously
summarized (Miller, 1973; McDowell, 1981; NCHS, 1985; NCHS, 1994).  The
NHANES III sample was designed to be self-weighting within a primary
sampling unit (PSU) for subdomains (age, sex, and race-ethnic groups).  While
the sample was fairly close to self-weighting nationally for each of these
subdomain groups, it was not representative of the total population, which
includes institutionalized, non-civilian persons that were outside the
scope of the survey.

The NHANES III sample represented the total civilian, noninstitutionalized
population, two months of age or over, in the 50 states and the District of
Columbia of the United States.  The first stage of the design consisted of
selecting a sample of 81 PSU's that were mostly individual counties.  In a
few cases, adjacent counties were combined to keep PSU's above a minimum
population size.  The PSU's were stratified and selected with probability
proportional to size (PPS).  Thirteen large counties (strata) were chosen
with certainty (probability of one).  For operational reasons, these 13
certainty PSU's were divided into 21 survey locations.  After the 13
certainty strata were designated, the remaining PSU's in the United States
were grouped into 34 strata, and two PSU's were selected per stratum (68
survey locations).  The selection was done with PPS and without
replacement.  The NHANES III sample therefore consists of 81 PSU's or 89
locations.

The 89 locations were randomly divided into two groups, one for each phase.
The first group consisted of 44 and the other of 45 locations.  One set
of PSU's was allocated to the first three-year survey period (1988-91) and
the other set to the second three-year period (1991-94).  Therefore,
unbiased estimates (from the point of view of sample selection) of health and
nutrition characteristics can be independently produced for both Phase 1
and Phase 2 as well as for both phases combined.

For most of the sample, the second stage of the design consisted of area
segments composed of city or suburban blocks, combinations of blocks, or
other area segments in places where block statistics were not produced in
the 1980 Census.  In the first phase of NHANES III, the area segments were
used only for a sample of persons who lived in housing units built before
1980.  For units built in 1980 and later, the second stage consisted of sets
of addresses selected from building permits issued in 1980 or later.  These
are referred to as "new construction segments."  In the second phase, 1990
Census data and maps were used to define the area segments.  Because the
second phase followed within a few years of the 1990 Census, new construction
did not account for a significant part of the sample, and the entire sample
came from the area segments.

The third stage of sample selection consisted of households and certain
types of group quarters, such as dormitories.  All households and eligible
group quarters in the sample segments were listed, and a subsample was
designated for screening to identify potential sample persons.  The
subsampling rates enabled production of a national, approximately
equal-probability sample of households in most of the United States with
higher rates for the geographic strata with high Mexican-American
populations.  Within each geographic stratum, there was a nearly
equal-probability sample of households across all 89 stands.

Persons within the sample of households or group quarters were the fourth
stage of sample selection.  All eligible members within a household were
listed, and a subsample of individuals was selected based on sex, age, and
race or ethnicity.  The definitions of the sex, age, race or ethnic
classes, subsampling rates, and designation of potential sample persons
within screened households were developed to provide approximately
self-weighting samples for each subdomain within geographic strata and at the
same time to maximize the average number of sample persons per sample
household.  Previous NHANES indicated that this increased the overall
participation rate.  Although the exact sample sizes were not known until
data collection was completed, estimates were made.  Below is a summary of
the sample sizes for the full six-year NHANES III at each stage of selection:

Number of PSU's                                  81
Number of stands (survey locations)              89
Number of segments                               2,144
Number of households screened                    93,653
Number of households with sample persons         19,528
Number of designated sample persons              39,695
Number of interviewed sample persons             33,994
Number of MEC-examined sample persons            30,818
Number of home-examined sample persons           493

More detailed information on the sample design and weighting and estimation
procedures for NHANES III can be found in the Plan and Operation of the
Third National Health and Nutrition Examination Survey, 1988-94 (NCHS, 1994;
U.S. DHHS, 1996) and in the Analytic and Reporting Guidelines: Third National
Health and Nutrition Examination Survey (NHANES III), 1988-94 (U.S. DHHS,
1996).

Analysis Guidelines

Because of the complex survey design used in NHANES III, traditional
methods of statistical analysis based on the assumption of a simple random
sample are not applicable.  Detailed descriptions of this issue and possible
analytic methods for analyzing NHANES data have been described earlier (NCHS,
1985; Yetley, 1987; Landis, 1982; Delgado, 1990).  Recent analytic and
reporting guidelines that should be used for most NHANES III analyses and
publications are contained in Analytic and Reporting Guidelines (U.S. DHHS,
1996).  These recommendations differ slightly from those used by analysts for
previous NHANES surveys.  These suggested guidelines provide a framework to
users for producing estimates that conform to the analytic design of the
survey.  All users are strongly urged to review these analytic and reporting
guidelines before beginning any analyses of NHANES III data.


It is important to remember that this set of statistical guidelines is not
absolute.  When conducting analyses, the analyst needs to use his/her
subject matter knowledge (including methodological issues) as well as
information about the survey design.  The more one deviates from the original
analytic categories defined in the sample design, the more important it is to
evaluate the results carefully and to interpret the findings cautiously.

In NHANES III, 89 survey locations were randomly divided into two sets or
phases, the first consisting of 44 and the other of 45 locations.  One set
of PSU's was allocated to the first three-year survey period (1988-91) and
the other set to the second three-year period (1991-94).  Therefore, unbiased
national estimates of health and nutrition characteristics can be
independently produced for each phase as well as for both phases combined.
Computation of national estimates from both phases combined (i.e., total
NHANES III) is the preferred option; individual phase estimates may be
highly variable.  In addition, individual phase estimates are not
statistically independent.  It is also difficult to evaluate whether
differences in individual phase estimates are real or due to methodological
differences.  That is, differences may be due to changes in sampling methods
or data collection methodology over time.  At this time, there is no valid
statistical test for examining differences between Phase 1 and Phase 2.
Therefore, although point estimates can be produced separately for each
phase, no test is available to test whether those estimates are
significantly different from each other.

NHANES III is based on a complex, multi-stage probability sample design.
Several aspects of the NHANES design must be taken into account in data
analysis, including the sample weights and the complex survey design.
Appropriate sample weights are needed to estimate prevalence, means,
medians, and other statistics.  Sample weights are used to produce correct
population estimates because each sample person does not have the same
probability of selection.  The sample weights incorporate the differential
probabilities of selection and include adjustments for noncoverage and
nonresponse.  A detailed discussion of nonresponse adjustments and issues
related to survey coverage have been published (U.S. DHHS, 1996).  With the
large oversampling of young children, older persons, black persons, and
Mexican-Americans in NHANES III, it is essential that the sample weights be
used in all analyses.  Otherwise, a misinterpretation of results is highly
likely.  Other aspects of the design that must be taken into account in data
analyses are the strata and PSU pairings from the sample design.  These
pairings should be used to estimate variances and test for statistical
significance.  For weighted analyses, analysts can use special computer
software packages that use an appropriate method for estimating variances for
complex samples such as SUDAAN (Shah, 1995) and WesVarPC (Westat, 1996).

Although initial exploratory analyses may be performed on unweighted data
using standard statistical packages and assuming simple random sampling,
final analyses should be done on weighted data using appropriate sample
weights.  A summary of the weighting methodology and the type of sample
weights developed for NHANES III is included in Weighting and Estimation
Methodology (U.S. DHHS, 1996).

The purpose of weighting the sample data is to permit analysts to produce
estimates of statistics that would have been obtained if the entire
sampling frame (the United States) had been surveyed.  Sample weights can be
considered as measures of the number of persons the particular sample
observation represents.  Weighting takes into account several features of
the survey:  the specific probabilities of selection for the individual
domains that were oversampled as well as nonresponse and differences between
the sample and the total U.S. population.  Differences between the sample and
the population may arise due to sampling variability, differential
undercoverage in the survey among demographic groups, and possibly other
types of response errors, such as differential response rates or
misclassification errors.  Sample weighting in NHANES III was used to:

1.   Compensate for differential probabilities of selection among subgroups
     (i.e., age-sex-race-ethnicity subdomains where persons living in
     different geographic strata were sampled at different rates);
2.   Reduce biases arising from the fact that nonrespondents may be
     different from those who participate;
3.   Bring sample data up to the dimensions of the target population
     totals;
4.   Compensate, to the extent possible, for inadequacies in the sampling
     frame (resulting from omissions of some housing units in the listing
     of area segments, omissions of persons with no fixed address, etc.); and
5.   To reduce variances in the estimation procedure by using auxiliary
     information that is known with a high degree of accuracy.

In NHANES III, the sample weighting was carried out in three stages.  The
first stage involved the computation of weights to compensate for unequal
probabilities of selection (objective 1, above).  The second stage adjusted
for nonresponse (objective 2).  The third stage used poststratification of
the sample weights to Census Bureau estimates of the U.S. population to
accomplish the third, fourth, and fifth objectives simultaneously.  In
NHANES III, several types of sample weights (see the sample weights table
that follows) were computed for the interviewed and examined sample and are
included in the NHANES III data file.  Also, sample weights were computed
separately for Phase 1 (1988-91), Phase 2 (1991-94), and total NHANES III
(1988-94) to facilitate analysis of items collected only in Phase 1, only
in Phase 2, and over six years of the survey.  Three sets of pseudo strata
and PSU pairings are provided to use with SUDAAN in variance estimation.
Since NHANES III is based on a complex, multi-stage sample design,
appropriate sample weights should be used in analyses to produce national
estimates of prevalence and associated variances while accounting for
unequal probability of selection of sample persons.  For example, the final
interview weight, WTPFQX6, should be used for analysis of the items or
questions from the family or household questionnaires, and the final MEC
examination weight, WTPFEX6, should be used for analysis of the
questionnaires and measurements administered in the MEC.  Furthermore, for a
combined analysis of measurements from the MEC examinations and associated
medical history questions from the household interview, the final MEC
examination weight, WTPFEX6, should be used.  We recommend using SUDAAN
(Shah, 1995) to estimate statistics of interest and the associated variance.
However, one can also use other published methods for variance estimation.
Application of SUDAAN and alternative methods, such as the average design
effect approach, balance repeated replication (BRR) methods, or jackknife
methods for variance estimation, are discussed in Weighting and Estimation
Methodology (U.S. DHHS, 1996).


Appropriate Uses of the NHANES III Sample Weights



Final interview weight, WTPFQX6

          Use only in conjunction with the sample interviewed at home and
          with items collected during the household interview.


Final examination (MEC only) weight, WTPFEX6

          Use only in conjunction with the MEC-examined sample and with
          interview and examination items collected at the MEC.


Final MEC+home examination weight, WTPFHX6

          Use only in conjunction with the MEC+home-examined sample and
          with items collected at both the MEC and home.


Final allergy weight, WTPFALG6

          Use only in conjunction with the allergy subsample and with items
          collected as part of the allergy component of the exam.


Final CNS weight, WTPFCNS6

          Use only in conjunction with the CNS subsample and with items
          collected as part of the CNS component of the exam.


Final morning examination (MEC only) subsample weight, WTPFSD6

          Use only in conjunction with the MEC-examined persons assigned to
          the morning subsample and only with items collected in the MEC
          exam.


Final afternoon/evening examination (MEC only) subsample weight, WTPFMD6

          Use only in conjunction with the MEC-examined persons assigned to
          the afternoon/evening subsample and only with items collected in
          the MEC exam.


Final morning examination (MEC+home) subsample weight, WTPFHSD6

          Use only in conjunction with the MEC- and home-examined persons
          assigned to the morning subsample and with items collected during
          the MEC and home examinations.


Final afternoon/evening examination (MEC+home) weight, WTPFHMD6

          Use only in conjunction with the MEC- and home-examined persons
          assigned to the afternoon/evening subsample and with items
          collected during the MEC and home examinations.


DATA PREPARATION AND PROCESSING PROCEDURES

Automated data collection procedures for the survey were introduced in
NHANES III.  In the mobile examination centers, data for the interview and
examination components were recorded directly onto a computerized data
collection form.  With the exception of a few independently automated
systems, the system was centrally integrated.  This operation allowed for
ongoing monitoring of much of the data.  Before the introduction of the
computer-assisted personal interview (CAPI), the household questionnaire
data were reviewed manually by field editors and interviewers.  CAPI
(1992-1994 only) questionnaires featured built-in edits to prevent entering
inconsistencies and out-of-range responses.  The multi-level data
collection and quality control systems are discussed in detail in the Plan
and Operation of the Third National Health and Nutrition Examination Survey,
1988-1994 (NCHS, 1994; U.S. DHHS, 1996).  All interview, laboratory, and
examination data were sent to NCHS for final processing.

Guidelines were developed that provided standards for naming variables,
filling missing values and coding conventional responses, handling missing
records, and standardizing two-part quantity/unit questionnaire variables.
NCHS staff, assisted by contract staff, developed data editing
specifications that checked data sets for valid codes, ranges, and skip
pattern consistencies and examined the consistency of values between
interrelated variables.  Comments, collected in both interviews and
examination components, were reviewed and recoded when possible.  Responses
to "Other" and "Specify" were recoded either to existing code categories or
to new categories.  The documentation for each data set includes notes for
those variables that have been recoded and standardized and for those
variables that differ significantly from what appears in the original data
collection instrument.  While the data have undergone many quality control
and editing procedures, there still may be values that appear extreme or
illogical.  Values that varied considerably from what was expected were
examined by analysts who checked for comments or other responses that might
help to clarify unusual values.  Generally, values were retained unless they
could not possibly be true, in which case they were changed to "Blank but
applicable."  Therefore, the user must review each data set for extreme or
inconsistent values and determine the status of each value for analysis.

Several editing conventions were used in the creation of final analytic
data sets:

1.   Standardized variables were created to replace all two-part
     quantity/unit questions using standard conversion factors.
     Standardized variables have the same name as the variable of the
     two-part question with an "S" suffix.  For instance, MAPF18S (Months
     received WIC benefits) in the MEC Adult Questionnaire was created from
     the two-part response option to question F18, "How long did you receive
     benefits from the WIC program?," using the conversion factor 12 months
     per year.

2.   Recoded variables were created by combining responses from two or more
     like variables, or by collapsing responses to create a summary
     variable for the purpose of confidentiality.  Recoded variables have the
     original variable name with an R suffix.  For example, place of birth
     variable (HFA6X) in the Family Questionnaire was collapsed to a three
     level response category (U.S., Mexico, Other) and renamed HFA6XR.
     Generally, only the recoded variable has been included in the data file.

3.   Fill values, a series of one or more digits, were used to represent
     certain specific conditions or responses.  Below is a list of the fill
     values that were employed.  Some of the fill values pertain only to
     questionnaire data, although 8-fill and blank-fill values are found in
     all data sets.  Other fill values, not included in this list, are used
     to represent component-specific conditions.

     6-fills = Varies/varied. (Questionnaires only)

     7-fills = Fewer than the smallest number that could be reported within
     the question structure (e.g., fewer than one cigarette per day).
     (Questionnaires only)

     8-fills = Blank but applicable/cannot be determined.  This means that
     a respondent was eligible to receive the question, test, or component
     but did not because of refusal, lack of time, lack of staff, loss of
     data, broken vial, language barrier, unreliability, or other similar
     reasons.

     9-fills = Don't know.  This fill was used only when a respondent did
     not know the response to a question and said, "I don't know."
     (Questionnaires only)

     Blank fills = Inapplicable.  If a respondent was not eligible for a
     questionnaire, test, or component because of age, gender, or specific
     reason, the variable was blank-filled.  In the questionnaire, if a
     respondent was not asked a question because of a skip-pattern,
     variables corresponding to the question were blank-filled.  For
     examination or laboratory components, if a person was excluded by a
     defined protocol (e.g., screening exclusion questions) and these
     criteria are included in the data set, then the corresponding
     variables were blank-filled for that person.  For home examinees,
     variables for examination components and blood tests not performed as
     part of the home examination protocol were blank-filled.

4.   For variables describing discrete data, codes of zero (0) were used to
     mean "none," "never," or the equivalent.  Value labels for which "0"
     is used include:  "has not had," "never regularly," "still taking," or
     "never stopped using."  Unless otherwise labeled, for variables
     containing continuous data, "zero" means "zero.

5.   Where there are logical skip patterns in the flow of the questionnaire
     or examination component, the skip was indicated by placing the
     variable label of the skip destination in parentheses as part of the
     value label of the response generating the skip.  For example, in the
     Physical Function Evaluation, the variable PFPWC (in wheelchair) has a
     value label, "2  No (PFPSCOOT)" that means that the next item for
     persons not in a wheelchair would be represented by the variable,
     PFPSCOOT.


Variable Nomenclature

A unique name was assigned to every NHANES III variable using a standard
convention.  By following this naming convention, the origin of each
variable is clear, and there is no chance of overlaying similar variables
across multiple components.  Variables range in length from three to eight
characters.  The first two variable characters represent the topic (e.g.,
analyte, questionnaire instrument, examination component) and are listed
below alphabetically by topic.  For questionnaires administered in the
household, the remainder of the variable name following the first two

characters indicates the question section and number.  For example, data
for the response to the Household Adult Questionnaire question B1 are
contained in the variable HAB1.  For most laboratory and examination
variables, as well as some other variables, a "P" in the third position
refers to "primary" and the remainder of the variable name is a brief
description of the item.  For instance, in the Laboratory Data File,
information on the length of time the person fasted before the first blood
draw is contained in the variable PHPFAST.  The variable PHPFAST was derived
as follows:  characters 1-2 (PH) refer to "phlebotomy," character 3 (P)
refers to "primary," characters 4-8 (FAST) refer to an abbreviation for
"fasting."


CODE           TOPIC

AT             Alanine aminotransferase (from biochemistry profile)
AM             Albumin (from biochemistry profile)
AP             Alkaline phosphatase (from biochemistry profile)
AL             Allergy skin test
AC             Alpha carotene
AN             Anisocytosis
AA             Apolipoprotein (AI)
AB             Apolipoprotein (B)
AS             Aspartate aminotransferase (from biochemistry profile)
LA             Atypical lymphocyte
AU             Audiometry
BA             Band
BO             Basophil
BS             Basophilic stippling
BC             Beta carotene
BX             Beta cryptoxanthin
BL             Blast
BU             Blood urea nitrogen (BUN) (from biochemistry profile)
BM             Body measurements
BD             Bone densitometry
C1             C-peptide (first venipuncture)
C2             C-peptide (second venipuncture)
CR             C-reactive protein
UD             Cadmium
CN             Central nervous system function evaluation
CL             Chloride (from biochemistry profile)
CO             Cotinine
CE             Creatinine (serum)(from biochemistry profile)
UR             Creatinine (urine)
DM             Demographic
DE             Dental examination
MQ             Diagnostic interview schedule
DR             Dietary recall (total nutrient intakes)
EO             Eosinophil
EP             Erythrocyte protoporphyrin
FR             Ferritin
FB             Fibrinogen
RB             Folate (RBC)
FO             Folate (serum)
FH             Follicle stimulating hormone (FSH)
FP             Fundus photography


CODE           TOPIC

GG             Gamma glutamyl transferase (GGT) (from biochemistry profile)
GU             Gallbladder ultrasonography
GB             Globulin (from biochemistry profile)
G1             Glucose (first venipuncture)
G2             Glucose (second venipuncture)
SG             Glucose (from biochemistry profile)
GH             Glycated hemoglobin
GR             Granulocyte
C3             HCO3 (Bicarbonate)(from biochemistry profile)
HD             HDL cholesterol
HP             Helicobacter pylori antibody
HT             Hematocrit
HG             Hemoglobin
AH             Hepatitis A antibody (HAV)
HB             Hepatitis B core antibody (anti-HBc)
SS             Hepatitis B surface antibody (anti-HBs)
SA             Hepatitis B surface antigen (HBsAg)
HC             Hepatitis C antibody (HCV)
DH             Hepatitis D antibody (HDV)
H1             Herpes 1 antibody
H2             Herpes 2 antibody
HX             Home examination (general)
HF             Household family questionnaire
HA             Household adult questionnaire
HQ             Household questionnaire variables (composite)
HS             Household screener questionnaire
HY             Household youth questionnaire
HZ             Hypochromia
I1             Insulin (first venipuncture)
I2             Insulin (second venipuncture)
UI             Iodine (urine)
FE             Iron
SF             Iron (from biochemistry profile)
LD             Lactate dehydrogenase (from biochemistry profile)
L1             Latex antibody
LC             LDL cholesterol (calculated)
PB             Lead
LP             Lipoprotein (a)
LH             Luteinizing hormone
LU             Lutein/zeaxanthin
LY             Lycopene
LM             Lymphocyte
MR             Macrocyte
MC             Mean cell hemoglobin (MCH)
MH             Mean cell hemoglobin concentration (MCHC)
MV             Mean cell volume (MCV)
PV             Mean platelet volume
MA             MEC adult questionnaire
MX             MEC examination (general)
FF             Dietary food frequency (ages 12-16 years)
MP             MEC proxy questionnaire
MY             MEC youth questionnaire
ME             Metamyelocyte
MI             Microcyte
MO             Monocyte
MN             Mononuclear cell
ML             Myelocyte


CODE           TOPIC

IC             Normalized calcium (derived from ionized calcium)
OS             Osmolality (from biochemistry profile)
PH             Phlebotomy data collected in MEC (e.g., questions)
PS             Phosphorus (from biochemistry profile)
PF             Physical function evaluation
PE             Physician's examination
PL             Platelet
DW             Platelet distribution width
PK             Poikilocytosis
PO             Polychromatophilia
SK             Potassium (from biochemistry profile)
PR             Promyelocyte
RC             Red blood cell count (RBC)
RW             Red cell distribution width (RDW)
RE             Retinyl esters
RF             Rheumatoid factor antibody
RU             Rubella antibody
WT             Sample weights
SE             Selenium
SI             Sickle cell
NA             Sodium (from biochemistry profile)
SH             Spherocyte
SP             Spirometry
SD             Survey design
TT             Target cell
TE             Tetanus
TB             Total bilirubin (from biochemistry profile)
CA             Total calcium
SC             Total calcium (from biochemistry profile)
TC             Total cholesterol
CH             Total cholesterol (from biochemistry profile)
TI             Total iron binding capacity (TIBC)
TP             Total protein (from biochemistry profile)
TX             Toxic granulation
TO             Toxoplasmosis antibody
PX             Transferrin saturation
TG             Triglycerides
TR             Triglycerides (from biochemistry profile)
TY             Tympanometry
UA             Uric acid (from biochemistry profile)
UB             Urinary albumin
VU             Vacuolated cells
VR             Varicella antibody
VA             Vitamin A
VB             Vitamin B12
VC             Vitamin C
VE             Vitamin E
WC             White blood cell count (WBC)
WW             WISC/WRAT cognitive test


GENERAL REFERENCES

Delgado JL, Johnson CL, Roy I, Trevino FM.  Hispanic Health and Nutrition
Examination Survey:  methodological considerations.  Amer J Pub Health
80(suppl.):6-10.  1990.

Engel A, Murphy RS, Maurer K, Collins E.  Plan and operation of the HANES I
Augmentation Survey of Adults 25-74 Years, United States, 1974-75.
National Center for Health Statistics.  Vital Health Stat 1(14).  1978.

Freeman DH, Freeman JL, Brock DB, Koch GG.  Strategies in the multivariate
analysis of data from complex surveys II:  an application to the United
States National Health Interview Survey.  Int Stat Rev 40(3):317-30.  1976.

Khare M, Mohadjer LK, Ezzati-Rice TM, Waksberg J.  An evaluation of
nonresponse bias in NHANES III (1988-91).  1994 Proceedings of the Survey
Research Methods section of the American Statistical Association.  1994.

Landis JR, Lepkowski JM, Eklund SA, Stehouwer SA.  A statistical
methodology for analyzing data from a complex survey, the first National
Health and Nutrition Examination Survey.  National Center for Health
Statistics.  Vital Health Stat 2(92).  1982.

McDowell A, Engel A, Massey JT, Maurer K.  Plan and operation of the second
National Health and Nutrition Examination Survey, 1976-80.  National Center
for Health Statistics.  Vital Health Stat 1(15).  1981.

Miller HW.  Plan and operation of the Health and Nutrition Examination
Survey, United States, 1971-1973.  National Center for Health Statistics.
Vital Health Stat 1(10a) and (10b).  1973.

National Center for Health Statistics.  Plan and initial program of the
Health Examination Survey.  Vital Health Stat 1(4).  1965.

National Center for Health Statistics.  Plan and operation of a health
examination survey of U.S. youths 12-17 years of age.  Vital Health Stat
1(8).  1969.

National Center for Health Statistics.  Plan and operation of the Hispanic
Health and Nutrition Examination Survey, 1982-84.  Vital Health Stat 1(19).
1985.

National Center for Health Statistics.  Plan and operation of the Third
National Health and Nutrition Examination Survey, 1988-94.  Vital Health
Stat 1(32).  1994.

National Center for Health Statistics.  Plan, operation, and response
results of a program of children's examinations.  Vital Health Stat 1(5).
1967.

Shah BV, Barnwell BG, Bieler GS.  SUDAAN User's Manual: Software for
Analysis of Correlated Data.  Research Triangle Park, NC:  Research Triangle
Institute.  Release 6.04.  1995.

Skinner CJ.  Aggregated analysis:  standard errors and significance tests.
In:  Skinner CJ, Holt D, Smith TMF, eds.  Analysis of complex surveys.  New
York:  John Wiley and Sons, Inc.  1989.

U.S. Department of Health and Human Services (DHHS).  National Center for
Health Statistics.  NHANES III reference manuals and reports (CD-ROM).
Hyattsville, MD:  Centers for Disease Control and Prevention, 1996.
Available from National Technical Information Service (NTIS), Springfield,
VA.  Acrobat .PDF format; includes access software:  Adobe Systems, Inc.
Acrobat Reader 2.1.

Westat, Inc.  A User's Guide to WesVarPC.  Rockville, MD.  Westat, Inc.
1996.

Yetley E, Johnson C.  Nutritional applications of the Health and Nutrition
Examination Surveys (HANES).  Annu Rev Nutr 7:441-63. 1987.


NHANES III LABORATORY DATA FILE

General Information


Introduction

The Laboratory Data File contains data from the urine collection and
venipuncture components of the examination, including almost all laboratory
test results (blood and urine) available to date.  The exceptions are
discussed elsewhere in this documentation.  In addition, auxiliary
information such as how long the examinee fasted, the time of day of the
venipuncture, and the conditions precluding venipuncture has been included.
This documentation presents information that should be reviewed before
proceeding with data analysis.

The documentation pertaining specifically to the Laboratory Data File is
divided into four main sections.  The first section, "General Information,"
provides information about the contents of the Laboratory Data File.  The
second section, "Data File Index," includes a brief description of all the
variables on the data set and shows the standard name of each variable and
its position in the data set.  The third section, "Item Descriptions,
Codes, Counts, and Notes" provides for each component a description, the
standard variable name and a brief description of the values that variable
can take on, a count of the frequency of occurrence of each value, notes by
variable, and appendices as necessary. "References" are provided in the
fourth section.

Blood and urine specimens were collected on examinees aged one year and
older at the mobile examination center (MEC).  For those examinees aged one
year and older who did not travel to the MEC, only blood specimens were
collected during the Home Examination (HE).  Hematologic profiles were
completed for all examinees, and specified laboratory tests were performed
upon each specimen based on the examinee's age and sex.  Only a limited
number of tests were performed on specimens collected during the Home
Examination.  Appendix 1 lists the laboratory tests by specimen type, age
group, sex, and whether the specimen was collected in the Home Examination.

The analysis of NHANES III laboratory data must be conducted with the key
survey design and basic demographic variables.  The NHANES III Household
Youth Questionnaire Data File (ages two months to 16 years) and the NHANES
III Household Adult Questionnaire Data File (ages 17 years and older)
contain demographic data, health indicators, and other related information
collected during household interviews.  They also contain all survey design
variables and sample weights for these age groups.  These two household
questionnaire files may be linked to the laboratory data file using the
unique survey participant (sample person) identifier SEQN.


Examinee Screening

Prior to the phlebotomy (venipuncture), a questionnaire was administered to
determine an examinee's eligibility for all phlebotomy procedures
(including venipuncture and the oral glucose tolerance test).  It included
questions to determine if it was safe to perform the venipuncture, to
document and determine fasting compliance, and to aid in analyzing the
results of the laboratory tests performed.  Examinees reporting hemophilia or
recent cancer chemotherapy treatment were excluded from the venipuncture.
For those examinees, the laboratory test results fields for all blood-based
laboratory tests were left blank.  Because examinees reporting current
insulin therapy were excluded from receiving the oral glucose tolerance test
(OGTT), the plasma glucose (G2P), serum insulin (I2P) and serum C-peptide
(C2P) results from the second venipuncture were left blank as well.

Although examinees aged 12 years and older were instructed to fast for
10-16 hours prior to the morning examination or for six hours before the
afternoon or evening examination, the instructions were not followed
uniformly.  Laboratory test results and the duration of the fast have been
included on the data file regardless of the examinee's fasting compliance.
Analysts should consider whether fasting status is crucial before undertaking
analyses.  Examinees who reported insulin use during the household
interview were not instructed to fast.


Specimen Collection and Processing Procedures

Detailed specimen collection and processing instructions are discussed in
the Manual for Medical Technicians (U.S. DHHS, 1996).  Vials were stored
under appropriate refrigerated (4-8 degrees Centigrade) or frozen (-20
degrees Centigrade) conditions until they were shipped to analytical
laboratories for testing.  The analytical methods used by each of the
participating laboratories are described in the Laboratory Procedures Used
for  NHANES III (U.S. DHHS, 1996).  The manual contains quality control
graphs and statistical summary information for each laboratory test at the
end of the laboratory method description.

Oral glucose tolerance testing:  During NHANES III, the OGTT was conducted
on MEC examinees aged 40-74 years.  The protocol included two timed
venipunctures and a glucose drink.  Two glucose drinks were used to measure
an examinee's ability to metabolize glucose -- Dextol(TM) and Trutol(TM).
After the first venipuncture, the examinee drank the glucose drink, and a
second venipuncture was performed approximately two hours later.


Examiner Training and Quality Control

The NHANES III laboratory staff consisted of medical technologists and
phlebotomists.  The medical technologists held baccalaureates in medical
technology.  Both they and the phlebotomists were certified by the American
Society for Clinical Pathologists or by a similar organization.

All laboratory staff completed comprehensive training in standardized
laboratory procedures before they began working in the MEC.  The MEC
phlebotomists completed comprehensive training in pediatric phlebotomy
techniques, including instruction by a pediatric nurse practitioner.
Laboratory team performance was monitored using several techniques.  NCHS
and contract consultants used a structured quality assurance evaluation
during unscheduled visits to evaluate both the quality of the laboratory work
and the quality-control procedures.  Each laboratory staff person was
observed for equipment operation, specimen collection and preparation, and
testing procedures, and constructive feedback was given to each team.  Formal
retraining sessions were conducted annually to ensure that required skill
levels were maintained.


Laboratory Protocol Changes from 1988 to 1994

Most laboratory tests were performed for the entire six years of NHANES
III.  Exceptions are detailed below.  Apolipoprotein AI and B tests were
included during 1988-1991 only.  Lipoprotein(a), Vitamin B12, and antibody
tests for immunoglobulin E, rubella, varicella, and toxoplasmosis were
conducted during 1991-1994.  For the 1991-1994 period, the OGTT procedure was
modified to add tests for C-peptide and insulin on specimens from the second
venipuncture.  For statistical analyses of these laboratory test results, the
appropriate Phase 1 or Phase 2 sample weight should be used.


Incomplete Data Release

At the time of this data release, some laboratory test results were not
available.  Tests for which results were unavailable included vitamin D,
immunoglobulin E, diphtheria antitoxin, measles antibody, homocysteine,
periodontal pathogens, thyroxine, thyroid stimulating hormone,
antithyroglobulin antibody, antimicrosomal antibody, and methylmalonic
acid.  Cotinine test results for 1988-1991 have been included in this
laboratory data file.  Cotinine testing is still being carried out for
1991-1994, and the laboratory test results will be released at a future date.
Results from urine pregnancy tests are included in the NHANES III Examination
Data File, rather than in the Laboratory Data File.

Serologic testing for human immunodeficiency virus (HIV) antibody and urine
testing for drugs of abuse were performed anonymously.  The drugs of abuse
for which examinees were tested were cocaine, marijuana, opiates,
phencyclidine, and amphetamines.  To maintain anonymity, the examinee's
serum and urine were labeled with a random identifying number, and limited
demographic data were linked to that number.  The new identifier was not
linked to the original sample identifier.  Therefore, these data cannot be
linked to other NHANES III data.  The HIV test was performed from 1988
through 1994; the urine drug testing was done from 1991 through 1994.
Because of the limited analytic potential of the HIV and drug data, this
file is not included in this data release.


Data Preparation and Processing

For laboratory tests with a lower detection limit, results below the lower
detection limit were replaced with a value equal to the detection limit
divided by the square root of two.  This value was created to help the user
distinguish a nondetectable laboratory test result from a measured
laboratory test result.  Appendix 2 documents the detection limit for each
laboratory test.

The SI unit (le Systeme International d Unites) is an outgrowth of the
metric system that has been used throughout most of the world.  In addition
to providing a uniform international system of units of measurement, a
uniform style is prescribed.  Laboratory test results not originally reported
in SI units were converted to SI units if applicable.  Conversion factors,
the format of the NHANES and SI results, and NHANES and SI units of measure
are in Appendix 3.  In converting NHANES III data to SI units, the goal was
to preserve the level of detail reported by the laboratories in the original
laboratory test result.  Therefore, the number of significant digits in the
laboratory test results data may be different from that in published
references.


The Laboratory Data File contains laboratory test results for glucose
(G1P), triglycerides (TGP), cholesterol (TCP), and iron (FEP) measured by
contract laboratories using reference analytic methods.  For these methods,
consult the Laboratory Procedures Used for NHANES III (U.S. DHHS, 1996).
However, the biochemistry profile also included measurements of these
analytes.  In general, for most analyses, the appropriate variables to use
are G1P, TGP, TCP and FEP.  The values from the biochemistry profile (SGP,
CHP, TRP, SFP) should not be used routinely.


The definition of a reference method by the National Committee for Clinical
Laboratory Standards (NCCLS) is "a thoroughly investigated method in which
exact and clear descriptions of the necessary conditions and procedures are
given for the accurate determination of one or more property values; the
documented accuracy and precision of the method are commensurate with the
method's use for assessing the accuracy of other methods for measuring the
same property values or for assigning reference method values to reference
materials" (NCCLS, 1991).


                     NHANES III Laboratory Data File Index
                   Whole Blood, Serum, Plasma, and Urine Data

    ------------------------------------------------------------------------
                                                   Variable
    Description                                    Name         Positions
    ------------------------------------------------------------------------


    DEMOGRAPHIC DATA
        HOUSEHOLD SCREENER QUESTIONNAIRE (HSQ)

    Sample person identification number .........  SEQN                 1-5

    Family sequence number ......................  DMPFSEQ             6-10
    Examination/interview Status ................  DMPSTAT               11

    Race-ethnicity ..............................  DMARETHN              12
    Race ........................................  DMARACER              13
    Ethnicity ...................................  DMAETHNR              14

    Sex .........................................  HSSEX                 15

    Age at interview (Screener) .................  HSAGEIR            16-17
    Age at interview - unit (Screener) ..........  HSAGEU                18
    Age in months at interview (screener) .......  HSAITMOR           19-22

    Family size (persons in family) .............  HSFSIZER           23-24
    Household size (persons in dwelling) ........  HSHSIZER           25-26

    County code .................................  DMPCNTYR           27-29
    FIPS code for State .........................  DMPFIPSR           30-31
    Rural/urban code based on USDA code .........  DMPMETRO              32

    Census region, weighting(Texas in south) ....  DMPCREGN              33
    Poverty Income Ratio (unimputed income) .....  DMPPIR             34-39

        SURVEY DESIGN DATA

    Phase of NHANES III survey ..................  SDPPHASE              40


                     NHANES III Laboratory Data File Index
                   Whole Blood, Serum, Plasma, and Urine Data

    ------------------------------------------------------------------------
                                                   Variable
    Description                                    Name         Positions
    ------------------------------------------------------------------------

    Total NHANES III pseudo-PSU .................  SDPPSU6               41
    Total NHANES III pseudo-stratum .............  SDPSTRA6           42-43
    Pseudo-PSU for phase 1 ......................  SDPPSU1               44
    Pseudo-stratum for phase 1 ..................  SDPSTRA1           45-46
    Pseudo-PSU for phase 2 ......................  SDPPSU2               47
    Pseudo-stratum for phase 2 ..................  SDPSTRA2           48-49

        SAMPLING WEIGHTS - TOTAL NHANES III (1988-94)

    Total interviewed sample final weight .......  WTPFQX6            50-58
    Total MEC-examined sample final weight ......  WTPFEX6            59-67
    Total M+H examined sample final weight ......  WTPFHX6            68-76
    Total allergy subsample final weight ........  WTPFALG6           77-85
    Total CNS subsample final weight ............  WTPFCNS6           86-94
    Total morning subsample final wgt ...........  WTPFSD6           95-103
    Total afternoon/eve subsample final wgt .....  WTPFMD6          104-112
    Total M+H morning subsample final wgt .......  WTPFHSD6         113-121
    Total M+H afternoon subsample final wgt .....  WTPFHMD6         122-130

        SAMPLING WEIGHTS - NHANES III PHASE 1 (1988-91)

    Phase 1 interviewed sample final wgt ........  WTPFQX1          131-139
    Phase 1 MEC examined sample final wgt .......  WTPFEX1          140-148
    Phase 1 M+H examined sample final wgt .......  WTPFHX1          149-157
    Phase 1 allergy subsample final wgt .........  WTPFALG1         158-166
    Phase 1 CNS subsample final wgt .............  WTPFCNS1         167-175
    Phase 1 morning sess subsample final wgt ....  WTPFSD1          176-184
    Phase 1 aft/eve subsample final wgt .........  WTPFMD1          185-193
    Phase 1 morning M+H subsample final wgt .....  WTPFHSD1         194-202
    Phase 1 aft/eve M+H subsample final wgt .....  WTPFHMD1         203-211

        SAMPLING WEIGHTS - NHANES III PHASE 2 (1991-94)

    Phase 2 interviewed sample final wgt ........  WTPFQX2          212-220
    Phase 2 MEC examined sample final wgt .......  WTPFEX2          221-229


                     NHANES III Laboratory Data File Index
                   Whole Blood, Serum, Plasma, and Urine Data

    ------------------------------------------------------------------------
                                                   Variable
    Description                                    Name         Positions
    ------------------------------------------------------------------------

    Phase 2 M+H examined sample final wgt .......  WTPFHX2          230-238
    Phase 2 allergy subsample final wgt .........  WTPFALG2         239-247
    Phase 2 CNS subsample final wgt .............  WTPFCNS2         248-256
    Phase 2 morning sess subsample final wgt ....  WTPFSD2          257-265
    Phase 2 aft/eve subsample final wgt .........  WTPFMD2          266-274
    Phase 2 morning M+H subsample final wgt .....  WTPFHSD2         275-283
    Phase 2 aft/eve M+H subsample final wgt .....  WTPFHMD2         284-292

        FAY'S BRR REPLICATE INTERVIEW WEIGHTS - TOTAL NHANES III (1988-94)

    Replicate 1 final interview weight ..........  WTPQRP1          293-301
    Replicate 2 final interview weight ..........  WTPQRP2          302-310
    Replicate 3 final interview weight ..........  WTPQRP3          311-319
    Replicate 4 final interview weight ..........  WTPQRP4          320-328
    Replicate 5 final interview weight ..........  WTPQRP5          329-337
    Replicate 6 final interview weight ..........  WTPQRP6          338-346
    Replicate 7 final interview weight ..........  WTPQRP7          347-355
    Replicate 8 final interview weight ..........  WTPQRP8          356-364
    Replicate 9 final interview weight ..........  WTPQRP9          365-373
    Replicate 10 final interview weight .........  WTPQRP10         374-382
    Replicate 11 final interview weight .........  WTPQRP11         383-391
    Replicate 12 final interview weight .........  WTPQRP12         392-400
    Replicate 13 final interview weight .........  WTPQRP13         401-409
    Replicate 14 final interview weight .........  WTPQRP14         410-418
    Replicate 15 final interview weight .........  WTPQRP15         419-427
    Replicate 16 final interview weight .........  WTPQRP16         428-436
    Replicate 17 final interview weight .........  WTPQRP17         437-445
    Replicate 18 final interview weight .........  WTPQRP18         446-454
    Replicate 19 final interview weight .........  WTPQRP19         455-463
    Replicate 20 final interview weight .........  WTPQRP20         464-472
    Replicate 21 final interview weight .........  WTPQRP21         473-481
    Replicate 22 final interview weight .........  WTPQRP22         482-490
    Replicate 23 final interview weight .........  WTPQRP23         491-499
    Replicate 24 final interview weight .........  WTPQRP24         500-508
    Replicate 25 final interview weight .........  WTPQRP25         509-517
    Replicate 26 final interview weight .........  WTPQRP26         518-526
    Replicate 27 final interview weight .........  WTPQRP27         527-535


                     NHANES III Laboratory Data File Index
                   Whole Blood, Serum, Plasma, and Urine Data

    ------------------------------------------------------------------------
                                                   Variable
    Description                                    Name         Positions
    ------------------------------------------------------------------------

    Replicate 28 final interview weight .........  WTPQRP28         536-544
    Replicate 29 final interview weight .........  WTPQRP29         545-553
    Replicate 30 final interview weight .........  WTPQRP30         554-562
    Replicate 31 final interview weight .........  WTPQRP31         563-571
    Replicate 32 final interview weight .........  WTPQRP32         572-580
    Replicate 33 final interview weight .........  WTPQRP33         581-589
    Replicate 34 final interview weight .........  WTPQRP34         590-598
    Replicate 35 final interview weight .........  WTPQRP35         599-607
    Replicate 36 final interview weight .........  WTPQRP36         608-616
    Replicate 37 final interview weight .........  WTPQRP37         617-625
    Replicate 38 final interview weight .........  WTPQRP38         626-634
    Replicate 39 final interview weight .........  WTPQRP39         635-643
    Replicate 40 final interview weight .........  WTPQRP40         644-652
    Replicate 41 final interview weight .........  WTPQRP41         653-661
    Replicate 42 final interview weight .........  WTPQRP42         662-670
    Replicate 43 final interview weight .........  WTPQRP43         671-679
    Replicate 44 final interview weight .........  WTPQRP44         680-688
    Replicate 45 final interview weight .........  WTPQRP45         689-697
    Replicate 46 final interview weight .........  WTPQRP46         698-706
    Replicate 47 final interview weight .........  WTPQRP47         707-715
    Replicate 48 final interview weight .........  WTPQRP48         716-724
    Replicate 49 final interview weight .........  WTPQRP49         725-733
    Replicate 50 final interview weight .........  WTPQRP50         734-742
    Replicate 51 final interview weight .........  WTPQRP51         743-751
    Replicate 52 final interview weight .........  WTPQRP52         752-760

        FAY'S BRR REPLICATE EXAMINATION WEIGHTS - TOTAL NHANES III (1988-94)

    Replicate 1 final exam weight ...............  WTPXRP1          761-769
    Replicate 2 final exam weight ...............  WTPXRP2          770-778
    Replicate 3 final exam weight ...............  WTPXRP3          779-787
    Replicate 4 final exam weight ...............  WTPXRP4          788-796
    Replicate 5 final exam weight ...............  WTPXRP5          797-805
    Replicate 6 final exam weight ...............  WTPXRP6          806-814
    Replicate 7 final exam weight ...............  WTPXRP7          815-823
    Replicate 8 final exam weight ...............  WTPXRP8          824-832
    Replicate 9 final exam weight ...............  WTPXRP9          833-841


                     NHANES III Laboratory Data File Index
                   Whole Blood, Serum, Plasma, and Urine Data

    ------------------------------------------------------------------------
                                                   Variable
    Description                                    Name         Positions
    ------------------------------------------------------------------------

    Replicate 10 final exam weight ..............  WTPXRP10         842-850
    Replicate 11 final exam weight ..............  WTPXRP11         851-859
    Replicate 12 final exam weight ..............  WTPXRP12         860-868
    Replicate 13 final exam weight ..............  WTPXRP13         869-877
    Replicate 14 final exam weight ..............  WTPXRP14         878-886
    Replicate 15 final exam weight ..............  WTPXRP15         887-895
    Replicate 16 final exam weight ..............  WTPXRP16         896-904
    Replicate 17 final exam weight ..............  WTPXRP17         905-913
    Replicate 18 final exam weight ..............  WTPXRP18         914-922
    Replicate 19 final exam weight ..............  WTPXRP19         923-931
    Replicate 20 final exam weight ..............  WTPXRP20         932-940
    Replicate 21 final exam weight ..............  WTPXRP21         941-949
    Replicate 22 final exam weight ..............  WTPXRP22         950-958
    Replicate 23 final exam weight ..............  WTPXRP23         959-967
    Replicate 24 final exam weight ..............  WTPXRP24         968-976
    Replicate 25 final exam weight ..............  WTPXRP25         977-985
    Replicate 26 final exam weight ..............  WTPXRP26         986-994
    Replicate 27 final exam weight ..............  WTPXRP27        995-1003
    Replicate 28 final exam weight ..............  WTPXRP28       1004-1012
    Replicate 29 final exam weight ..............  WTPXRP29       1013-1021
    Replicate 30 final exam weight ..............  WTPXRP30       1022-1030
    Replicate 31 final exam weight ..............  WTPXRP31       1031-1039
    Replicate 32 final exam weight ..............  WTPXRP32       1040-1048
    Replicate 33 final exam weight ..............  WTPXRP33       1049-1057
    Replicate 34 final exam weight ..............  WTPXRP34       1058-1066
    Replicate 35 final exam weight ..............  WTPXRP35       1067-1075
    Replicate 36 final exam weight ..............  WTPXRP36       1076-1084
    Replicate 37 final exam weight ..............  WTPXRP37       1085-1093
    Replicate 38 final exam weight ..............  WTPXRP38       1094-1102
    Replicate 39 final exam weight ..............  WTPXRP39       1103-1111
    Replicate 40 final exam weight ..............  WTPXRP40       1112-1120
    Replicate 41 final exam weight ..............  WTPXRP41       1121-1129
    Replicate 42 final exam weight ..............  WTPXRP42       1130-1138
    Replicate 43 final exam weight ..............  WTPXRP43       1139-1147
    Replicate 44 final exam weight ..............  WTPXRP44       1148-1156
    Replicate 45 final exam weight ..............  WTPXRP45       1157-1165
    Replicate 46 final exam weight ..............  WTPXRP46       1166-1174
    Replicate 47 final exam weight ..............  WTPXRP47       1175-1183


                     NHANES III Laboratory Data File Index
                   Whole Blood, Serum, Plasma, and Urine Data

    ------------------------------------------------------------------------
                                                   Variable
    Description                                    Name         Positions
    ------------------------------------------------------------------------

    Replicate 48 final exam weight ..............  WTPXRP48       1184-1192
    Replicate 49 final exam weight ..............  WTPXRP49       1193-1201
    Replicate 50 final exam weight ..............  WTPXRP50       1202-1210
    Replicate 51 final exam weight ..............  WTPXRP51       1211-1219
    Replicate 52 final exam weight ..............  WTPXRP52       1220-1228

        HOUSEHOLD YOUTH QUESTIONNAIRE (HYQ)

    Age in months at youth interview ............  HYAITMO        1229-1232

        MEC EXAMINATION

    Language used by SP in MEC ..................  MXPLANG             1233
    Session for MEC examination .................  MXPSESSR            1234
    Day of week of MEC exam .....................  MXPTIDW             1235
    Age in months at MEC exam ...................  MXPAXTMR       1236-1239

        HOME EXAMINATION

    Day of week of home exam ....................  HXPTIDW             1240
    Age in months at home exam ..................  HXPAXTMR       1241-1244
    Session for home examination ................  HXPSESSR            1245

    PHLEBOTOMY SCREENING QUESTIONNAIRE

    Language ....................................  PHPLANG             1246
    Do you have hemophilia? .....................  PHPHEMO             1247
    Recent chemo/within the past four weeks .....  PHPCHM2             1248
    Are you currently taking insulin? ...........  PHPINSU             1249
    Time participant last ate ...................  PHPSNTI        1250-1254
    Day participant last ate ....................  PHPSNDA             1255
    Have you had anything to drink? .............  PHPDRIN             1256
    Time participant last drank .................  PHPDRTI        1257-1261
    Day participant last drank ..................  PHPDRDA             1262


                     NHANES III Laboratory Data File Index
                   Whole Blood, Serum, Plasma, and Urine Data

    ------------------------------------------------------------------------
                                                   Variable
    Description                                    Name         Positions
    ------------------------------------------------------------------------

    Length of calculated fast (in hours) ........  PHPFAST        1263-1267
    Time of venipuncture ........................  PHPBEST        1268-1272

    HEMATOLOGY

    White blood cell count ......................  WCP            1273-1277
    White blood cell count: SI ..................  WCPSI          1278-1282
    Lymphocyte percent (Coulter) ................  LMPPCNT        1283-1287
    Mononuclear percent (Coulter) ...............  MOPPCNT        1288-1292
    Granulocyte percent (Coulter) ...............  GRPPCNT        1293-1297
    Lymphocyte number (Coulter) .................  LMP            1298-1302
    Mononuclear number (Coulter) ................  MOP            1303-1306
    Granulocyte number (Coulter) ................  GRP            1307-1311
    Red blood cell count ........................  RCP            1312-1315
    Red blood cell count:  SI ...................  RCPSI          1316-1319
    Hemoglobin (g/dL) ...........................  HGP            1320-1324
    Hemoglobin:  SI (g/L) .......................  HGPSI          1325-1329
    Hematocrit (%) ..............................  HTP            1330-1334
    Hematocrit:  SI (L/L=1) .....................  HTPSI          1335-1339
    Mean cell volume:  SI (fL) ..................  MVPSI          1340-1344
    Mean cell hemoglobin:  SI (pg) ..............  MCPSI          1345-1349
    Mean cell hemoglobin concentration ..........  MHP            1350-1354
    Mean cell hemoglobin concentration: SI ......  MHPSI          1355-1359
    Red cell distribution width (%) .............  RWP            1360-1364
    Red cell distribution width:SI(fraction) ....  RWPSI          1365-1370
    Platelet count ..............................  PLP            1371-1375
    Platelet count:  SI .........................  PLPSI          1376-1380
    Platelet distribution width (%) .............  DWP            1381-1385
    Mean platelet volume:  SI (fL) ..............  PVPSI          1386-1390
    Segment neutrophil(percent of 100 cells) ....  GRPDIF         1391-1393
    Lymphocytes (percent of 100 cells) ..........  LMPDIF         1394-1396
    Monocytes (percent of 100 cells) ............  MOPDIF         1397-1398
    Eosinophils (percent of 100 cells) ..........  EOP            1399-1400
    Basophils (percent of 100 cells) ............  BOP            1401-1402
    Blasts (percent of 100 cells) ...............  BLP                 1403
    Promyelocytes (percent of 100 cells) ........  PRP                 1404
    Metamyelocytes (percent of 100 cells) .......  MEP                 1405


                     NHANES III Laboratory Data File Index
                   Whole Blood, Serum, Plasma, and Urine Data

    ------------------------------------------------------------------------
                                                   Variable
    Description                                    Name         Positions
    ------------------------------------------------------------------------

    Myelocytes (percent of 100 cells) ...........  MLP                 1406
    Bands (percent of 100 cells) ................  BAP            1407-1408
    Atyp lymphocytes (percent of 100 cells) .....  LAP            1409-1410
    Anisocytosis (variation of cell size) .......  ANP                 1411
    Basophilic stippling ........................  BSP                 1412
    Hypochromia (stain intensity of cell) .......  HZP                 1413
    Poikilocytosis (cell shape variation) .......  PKP                 1414
    Polychromatophilia(bluish color of cell) ....  POP                 1415
    Macrocytosis (large cell prevalence) ........  MRP                 1416
    Microcytosis (small cell prevalence) ........  MIP                 1417
    Sickle cells ................................  SIP                 1418
    Spherocytosis ...............................  SHP                 1419
    Target cells ................................  TTP                 1420
    Toxic granulation ...........................  TXP                 1421
    Vacuolated cells ............................  VUP                 1422

    GENERAL BIOCHEMISTRY TESTS

    Lead (ug/dL) ................................  PBP            1423-1426
    Lead:  SI (umol/L) ..........................  PBPSI          1427-1431
    Erythrocyte protoporphyrin (ug/dL) ..........  EPP            1432-1435
    Erythrocyte protoporphyrin:  SI (umol/L) ....  EPPSI          1436-1440
    Serum iron (ug/dL) ..........................  FEP            1441-1443
    Serum iron:  SI (umol/L) ....................  FEPSI          1444-1448
    Serum TIBC (ug/dL) ..........................  TIP            1449-1452
    Serum TIBC:  SI (umol/L) ....................  TIPSI          1453-1458
    Serum transferrin saturation (%) ............  PXP            1459-1462
    Serum ferritin (ng/mL) ......................  FRP            1463-1466
    Serum ferritin:  SI (ug/L) ..................  FRPSI          1467-1470
    Serum folate (ng/mL) ........................  FOP            1471-1475
    Serum folate:  SI (nmol/L) ..................  FOPSI          1476-1480
    RBC folate (ng/mL) ..........................  RBP            1481-1484
    RBC folate:  SI (nmol/L) ....................  RBPSI          1485-1490
    Serum vitamin B12 (pg/mL) ...................  VBP            1491-1496
    Serum vitamin B12:  SI (pmol/L) .............  VBPSI          1497-1504
    Serum vitamin C (mg/dL) .....................  VCP            1505-1508
    Serum vitamin C:  SI (mmol/L) ...............  VCPSI          1509-1514


                     NHANES III Laboratory Data File Index
                   Whole Blood, Serum, Plasma, and Urine Data

    ------------------------------------------------------------------------
                                                   Variable
    Description                                    Name         Positions
    ------------------------------------------------------------------------

    Serum normalized calcium:  SI (mmol/L) ......  ICPSI          1515-1518
    Serum total calcium:  SI (mmol/L) ...........  CAPSI          1519-1522
    Serum selenium (ng/mL) ......................  SEP            1523-1526
    Serum selenium:  SI (nmol/L) ................  SEPSI          1527-1530
    Serum vitamin A (ug/dL) .....................  VAP            1531-1533
    Serum vitamin A:  SI (umol/L) ...............  VAPSI          1534-1537
    Serum vitamin E (ug/dL) .....................  VEP            1538-1542
    Serum vitamin E:  SI (umol/L) ...............  VEPSI          1543-1548
    Serum alpha carotene (ug/dL) ................  ACP            1549-1551
    Serum alpha carotene:  SI (umol/L) ..........  ACPSI          1552-1555
    Serum beta carotene (ug/dL) .................  BCP            1556-1559
    Serum beta carotene: SI (umol/L) ............  BCPSI          1560-1564
    Serum beta cryptoxanthin (ug/dL) ............  BXP            1565-1567
    Serum beta cryptoxanthin:  SI (umol/L) ......  BXPSI          1568-1571
    Serum lutein/zeaxanthin (ug/dL) .............  LUP            1572-1574
    Serum lutein/zeaxanthin:  SI (umol/L) .......  LUPSI          1575-1578
    Serum lycopene (ug/dL) ......................  LYP            1579-1581
    Serum lycopene:  SI (umol/L) ................  LYPSI          1582-1585
    Serum sum retinyl esters (ug/dL) ............  REP            1586-1588
    Serum sum retinyl esters:  SI (umol/L) ......  REPSI          1589-1592
    Serum cotinine (ng/mL) ......................  COP            1593-1597
    Serum cholesterol (mg/dL) ...................  TCP            1598-1600
    Serum cholesterol:  SI (mmol/L) .............  TCPSI          1601-1605
    Serum triglycerides (mg/dL) .................  TGP            1606-1609
    Serum triglycerides:  SI (mmol/L) ...........  TGPSI          1610-1614
    Serum LDL cholesterol (mg/dL) ...............  LCP            1615-1617
    Serum LDL cholesterol:  SI (mmol/L) .........  LCPSI          1618-1621
    Serum HDL cholesterol (mg/dL) ...............  HDP            1622-1624
    Serum HDL cholesterol:  SI (mmol/L) .........  HDPSI          1625-1628
    Serum apolipoprotein AI (mg/dL) .............  AAP            1629-1631
    Serum apolipoprotein AI: SI (g/L) ...........  AAPSI          1632-1635
    Serum apolipoprotein B (mg/dL) ..............  ABP            1636-1638
    Serum apolipoprotein B: SI (g/L) ............  ABPSI          1639-1642
    Serum lipoprotein(a) (mg/dL) ................  LPP            1643-1645
    Serum lipoprotein(a):  SI (g/L) .............  LPPSI          1646-1649
    Serum FSH:  SI (IU/L) .......................  FHPSI          1650-1654
    Serum luteinizing hormone: SI (IU/L) ........  LHPSI          1655-1658
    Plasma fibrinogen (mg/dL) ...................  FBP            1659-1662


                     NHANES III Laboratory Data File Index
                   Whole Blood, Serum, Plasma, and Urine Data

    ------------------------------------------------------------------------
                                                   Variable
    Description                                    Name         Positions
    ------------------------------------------------------------------------

    Plasma fibrinogen:  SI (g/L) ................  FBPSI          1663-1666
    Serum C-reactive protein (mg/dL) ............  CRP            1667-1671

    ANTIBODY TESTS

    Serum tetanus antibody (U/mL) ...............  TEP            1672-1677
    Serum hepatitis A antibody ..................  AHP                 1678
    Serum hepatitis B core antibody .............  HBP                 1679
    Serum hepatitis B surface antibody ..........  SSP            1680-1681
    Serum hepatitis B surface antigen ...........  SAP                 1682
    Serum hepatitis C antibody ..................  HCP                 1683
    Serum hepatitis D antibody ..................  DHP                 1684
    Serum herpes I antibody .....................  H1P                 1685
    Serum herpes II antibody ....................  H2P                 1686
    Serum rubella antibody ......................  RUP            1687-1691
    Serum rubells antibody (IU) .................  RUPUNIT        1692-1695
    Serum varicella antibody ....................  VRP            1696-1700
    Serum toxoplasmosis antibody ................  TOP            1701-1703
    Serum rheumatoid factor antibody ............  RFP            1704-1708
    Serum latex antibody (IU/mL) ................  L1P            1709-1713
    Serum helicobacter pylori antibody ..........  HPP                 1714

    BIOCHEMISTRY PROFILE

    Serum sodium:  SI (mmol/L) ..................  NAPSI          1715-1719
    Serum potassium:  SI (mmol/L) ...............  SKPSI          1720-1723
    Serum chloride:  SI (mmol/L) ................  CLPSI          1724-1728
    Serum bicarbonate:  SI (mmol/L) .............  C3PSI          1729-1730
    Serum total calcium (mg/dL) .................  SCP            1731-1734
    Serum total calcium: SI (mmol/L) ............  SCPSI          1735-1739
    Serum phosphorus (mg/dL) ....................  PSP            1740-1743
    Serum phosphorus: SI (mmol/L) ...............  PSPSI          1744-1748
    Serum uric acid (mg/dL) .....................  UAP            1749-1752
    Serum uric acid:  SI (umol/L) ...............  UAPSI          1753-1757
    Serum glucose (mg/dL) .......................  SGP            1758-1760
    Serum glucose:  SI (mmol/L) .................  SGPSI          1761-1765


                     NHANES III Laboratory Data File Index
                   Whole Blood, Serum, Plasma, and Urine Data

    ------------------------------------------------------------------------
                                                   Variable
    Description                                    Name         Positions
    ------------------------------------------------------------------------

    Serum blood urea nitrogen (mg/dL) ...........  BUP            1766-1768
    Serum blood urea nitrogen:  SI (mmol/L) .....  BUPSI          1769-1773
    Serum total bilirubin (mg/dL) ...............  TBP            1774-1777
    Serum total bilirubin:  SI (umol/L) .........  TBPSI          1778-1783
    Serum creatinine (mg/dL) ....................  CEP            1784-1787
    Serum creatinine:  SI (umol/L) ..............  CEPSI          1788-1793
    Serum iron (ug/dL) ..........................  SFP            1794-1796
    Serum iron:  SI (umol/L) ....................  SFPSI          1797-1800
    Serum cholesterol (mg/dL) ...................  CHP            1801-1804
    Serum cholesterol:  SI (mmol/L) .............  CHPSI          1805-1810
    Serum triglycerides (mg/dL) .................  TRP            1811-1814
    Serum triglycerides:  SI (mmol/L) ...........  TRPSI          1815-1820
    Aspartate aminotransferase: SI(U/L) .........  ASPSI          1821-1823
    Alanine aminotransferase:  SI (U/L) .........  ATPSI          1824-1826
    Gamma glutamyl transferase: SI(U/L) .........  GGPSI          1827-1830
    Serum lactate dehydrogenase:  SI (U/L) ......  LDPSI          1831-1834
    Serum alkaline phosphatase:  SI (U/L) .......  APPSI          1835-1838
    Serum total protein (g/dL) ..................  TPP            1839-1842
    Serum total protein:  SI (g/L) ..............  TPPSI          1843-1845
    Serum albumin (g/dL) ........................  AMP            1846-1848
    Serum albumin:  SI (g/L) ....................  AMPSI          1849-1851
    Serum globulin (g/dL) .......................  GBP            1852-1854
    Serum globulin:  SI (g/L) ...................  GBPSI          1855-1857
    Serum osmolality:  SI (mmol/Kg) .............  OSPSI          1858-1860

    DIABETES TESTING PROFILE

    Glycated hemoglobin: (%) ....................  GHP            1861-1864
    Glycated hemoglobin: test method ............  GHPMETH             1865
    Glycat. hemoglobin: hemoglobin F percent ....  GHPPCT         1866-1869
    Glycat. hemoglobin: hemoglobin S present ....  GHPHBS              1870
    Plasma glucose (mg/dL) ......................  G1P            1871-1875
    Plasma glucose:  SI (mmol/L) ................  G1PSI          1876-1881
    Incomplete glucose test (OGTT) code .........  G1PCODE        1882-1883
    Minutes between drink and second draw .......  G1PTIM1        1884-1886
    Minutes between first and second draw .......  G1PTIM2        1887-1889
    Second plasma glucose (mg/dL) ...............  G2P            1890-1894


                     NHANES III Laboratory Data File Index
                   Whole Blood, Serum, Plasma, and Urine Data

    ------------------------------------------------------------------------
                                                   Variable
    Description                                    Name         Positions
    ------------------------------------------------------------------------

    Second plasma glucose: SI (mmol/L) ..........  G2PSI          1895-1900
    Serum C-peptide (pmol/mL) ...................  C1P            1901-1905
    Serum C-peptide: SI (nmol/L) ................  C1PSI          1906-1910
    Second serum C-peptide (pmol/mL) ............  C2P            1911-1916
    Second serum C-peptide: SI (nmol/L) .........  C2PSI          1917-1922
    Serum insulin (uU/mL) .......................  I1P            1923-1928
    Serum insulin:  SI (pmol/L) .................  I1PSI          1929-1935
    Serum insulin: test kit .....................  I1P2PFLG            1936
    Second serum insulin (uU/mL) ................  I2P            1937-1942
    Second serum insulin: SI (pmol/L) ...........  I2PSI          1943-1949

    URINE TESTS

    Urinary cadmium (ng/mL) .....................  UDP            1950-1954
    Urinary cadmium: SI (nmol/L) ................  UDPSI          1955-1960
    Urinary creatinine (mg/dL) ..................  URP            1961-1965
    Urinary creatinine: SI (mmol/L) .............  URPSI          1966-1969
    Urinary albumin (ug/mL) .....................  UBP            1970-1975
    Urinary iodine (ug/dL) ......................  UIP            1976-1982



                        NHANES III Laboratory Data File
                   Whole Blood, Serum, Plasma, and Urine Data

    ------------------------------------------------------------------------
    FILENAME=LAB                  VERSION 0.9                        N=29314
    ------------------------------------------------------------------------
                                DEMOGRAPHIC DATA
    ------------------------------------------------------------------------
                     HOUSEHOLD SCREENER QUESTIONNAIRE (HSQ)
    ------------------------------------------------------------------------
    Positions            Item description
    SAS name    Counts       and code                               Notes
    ------------------------------------------------------------------------

           1-5             Sample person identification number
      SEQN        29314    00003-53623



                        NHANES III Laboratory Data File
                   Whole Blood, Serum, Plasma, and Urine Data

    ------------------------------------------------------------------------
                                DEMOGRAPHIC DATA
    ------------------------------------------------------------------------
                     HOUSEHOLD SCREENER QUESTIONNAIRE (HSQ)
    ------------------------------------------------------------------------
    Positions            Item description
    SAS name    Counts       and code                               Notes
    ------------------------------------------------------------------------

           6-10            Family sequence number
      DMPFSEQ     29314    00001-20076

             11            Examination/interview status             See note
      DMPSTAT     28857    2     Interviewed, MEC-examined
                    457    3     Interviewed, home-examined



                        NHANES III Laboratory Data File
                   Whole Blood, Serum, Plasma, and Urine Data

    ------------------------------------------------------------------------
                                DEMOGRAPHIC DATA
    ------------------------------------------------------------------------
                     HOUSEHOLD SCREENER QUESTIONNAIRE (HSQ)
    ------------------------------------------------------------------------
    Positions            Item description
    SAS name    Counts       and code                               Notes
    ------------------------------------------------------------------------

             12            Race-ethnicity                           See note
      DMARETHN    10507    1     Non-Hispanic white
                   8756    2     Non-Hispanic black
                   8786    3     Mexican-American
                   1265    4     Other

             13            Race                                     See note
      DMARACER    19180    1     White
                   9091    2     Black
                   1037    3     Other
                      6    8     Mexican-American of unknown race

             14            Ethnicity                                See note
      DMAETHNR     8786    1     Mexican-American
                    788    2     Other Hispanic
                  19740    3     Not Hispanic



                        NHANES III Laboratory Data File
                   Whole Blood, Serum, Plasma, and Urine Data

    ------------------------------------------------------------------------
                                DEMOGRAPHIC DATA
    ------------------------------------------------------------------------
                     HOUSEHOLD SCREENER QUESTIONNAIRE (HSQ)
    ------------------------------------------------------------------------
    Positions            Item description
    SAS name    Counts       and code                               Notes
    ------------------------------------------------------------------------

             15            Sex
      HSSEX       13980    1     Male
                  15334    2     Female

          16-17            Age at interview (Screener)              See note
      HSAGEIR     29165    01-89
                    149    90    90+

             18            Age at interview-unit (Screener)
      HSAGEU      29314    2     Years



                        NHANES III Laboratory Data File
                   Whole Blood, Serum, Plasma, and Urine Data

    ------------------------------------------------------------------------
                                DEMOGRAPHIC DATA
    ------------------------------------------------------------------------
                     HOUSEHOLD SCREENER QUESTIONNAIRE (HSQ)
    ------------------------------------------------------------------------
    Positions            Item description
    SAS name    Counts       and code                               Notes
    ------------------------------------------------------------------------

          19-22            Age in months (Screener)                 See note
      HSAITMOR    29157    0012-1079
                    147    1080  1080+ months
                     10    9999  Don't know

          23-24            Family size                              See note
      HSFSIZER     3076    01
                   5411    02
                   5006    03
                   5950    04
                   4313    05
                   2312    06
                   1236    07
                    821    08
                    428    09
                    761    10    10+

          25-26            Household size                           See note
      HSHSIZER     2478    01
                   5473    02
                   5040    03
                   6041    04
                   4337    05
                   2393    06
                   1301    07
                    893    08
                    459    09
                    899    10    10+



                        NHANES III Laboratory Data File
                   Whole Blood, Serum, Plasma, and Urine Data

    ------------------------------------------------------------------------
                                DEMOGRAPHIC DATA
    ------------------------------------------------------------------------
                     HOUSEHOLD SCREENER QUESTIONNAIRE (HSQ)
    ------------------------------------------------------------------------
    Positions            Item description
    SAS name    Counts       and code                               Notes
    ------------------------------------------------------------------------

          27-29            County FIPS codes for United States      See note
      DMPCNTYR             counties with populations >= 500,000
                  13799    001-439
                  15515    Blank

          30-31            State FIPS codes for United States       See note
      DMPFIPSR             counties with populations >= 500,000
                    359    04
                   4531    06
                   1090    12
                    900    17
                    242    25
                    676    26
                    312    29
                   1662    36
                    625    39
                    724    42
                    276    44
                   2044    48
                    358    53
                  15515    Blank

             32            Urbanization classification based on     See note
      DMPMETRO             USDA Rural/Urban continuum codes.
                  14615    1     Central counties of metro areas of
                                 1 million population or more,
                                 OR,
                                 Fringe counties of metro areas of
                                 1 million population or more
                  14699    2     All other areas



                        NHANES III Laboratory Data File
                   Whole Blood, Serum, Plasma, and Urine Data

    ------------------------------------------------------------------------
                                DEMOGRAPHIC DATA
    ------------------------------------------------------------------------
                     HOUSEHOLD SCREENER QUESTIONNAIRE (HSQ)
    ------------------------------------------------------------------------
    Positions            Item description
    SAS name    Counts       and code                               Notes
    ------------------------------------------------------------------------

             33            Census region                            See note
      DMPCREGN     3740    1     Northeast
                   5498    2     Midwest
                  12639    3     South
                   7437    4     West

          34-39            Poverty Income Ratio                     See note
      DMPPIR         82    00.000  No reported income
                  26503    000.02-11.889
                   2729    888888  Blank but applicable



                        NHANES III Laboratory Data File
                   Whole Blood, Serum, Plasma, and Urine Data

    ------------------------------------------------------------------------
                                DEMOGRAPHIC DATA
    ------------------------------------------------------------------------
                               SURVEY DESIGN DATA
    ------------------------------------------------------------------------
    Positions            Item description
    SAS name    Counts       and code                               Notes
    ------------------------------------------------------------------------

             40            Phase of NHANES III survey               See note
      SDPPHASE    14833    1     1988-1991
                  14481    2     1991-1994

             41            Total NHANES III Pseudo-PSU              See note
      SDPPSU6     14630    1
                  14684    2

          42-43            Total NHANES III Pseudo-stratum          See note
      SDPSTRA6    29314    01-49

             44            Phase 1 Pseudo-PSU                       See note
      SDPPSU1      7633    1
                   7200    2
                  14481    Blank

          45-46            Phase 1 Pseudo-stratum                   See note
      SDPSTRA1    14833    01-23
                  14481    Blank

             47            Phase 2 Pseudo-PSU                       See note
      SDPPSU2      7080    1
                   7401    2
                  14833    Blank

          48-49            Phase 2 Pseudo-stratum                   See note
      SDPSTRA2    14481    01-23
                  14833    Blank



                        NHANES III Laboratory Data File
                   Whole Blood, Serum, Plasma, and Urine Data

    ------------------------------------------------------------------------
                                DEMOGRAPHIC DATA
    ------------------------------------------------------------------------
                 SAMPLING WEIGHTS - TOTAL NHANES III (1988-94)
    ------------------------------------------------------------------------
    Positions            Item description
    SAS name    Counts       and code                               Notes
    ------------------------------------------------------------------------

          50-58            Total NHANES III interviewed sample      See note
      WTPFQX6              final weight
                  29314    000215.53-0132278.9

          59-67            Total NHANES III MEC-examined sample     See note
      WTPFEX6              final weight
                    457    000000.00
                  28857    000213.45-140778.72

          68-76            Total NHANES III MEC and home-           See note
      WTPFHX6              examined final weight
                  29314    000214.25-139744.91

          77-85            Total NHANES III allergy subsample       See note
      WTPFALG6             final weight
                     23    000000.00
                  12106    000213.45-288897.91
                  17185    Blank

          86-94            Total NHANES III central nervous         See note
      WTPFCNS6             system (CNS) subsample final weight
                     12    000000.00
                   5662    001316.46-295826.48
                  23640    Blank

          95-103           Total NHANES III morning session         See note
      WTPFSD6              MEC-examined subsample final weight
                    920    000000.00
                   9127    000450.95-292590.96
                  19267    Blank

         104-112           Total NHANES III afternoon/evening       See note
      WTPFMD6              session MEC-examined subsample final
                           weight
                    697    000000.00
                   9497    000495.13-256201.99
                  19120    Blank



                        NHANES III Laboratory Data File
                   Whole Blood, Serum, Plasma, and Urine Data

    ------------------------------------------------------------------------
                                DEMOGRAPHIC DATA
    ------------------------------------------------------------------------
                 SAMPLING WEIGHTS - TOTAL NHANES III (1988-94)
    ------------------------------------------------------------------------
    Positions            Item description
    SAS name    Counts       and code                               Notes
    ------------------------------------------------------------------------

         113-121           Total NHANES III morning session MEC     See note
      WTPFHSD6             and home-examined subsample final
                           weight
                    791    000000.00
                   9254    000446.49-291479.91
                  19269    Blank

         122-130           Total NHANES III afternoon/evening       See note
      WTPFHMD6             session MEC and home-examined
                           subsample final weight
                    562    000000.00
                   9630    000503.56-256245.36
                  19122    Blank



                        NHANES III Laboratory Data File
                   Whole Blood, Serum, Plasma, and Urine Data

    ------------------------------------------------------------------------
                                DEMOGRAPHIC DATA
    ------------------------------------------------------------------------
                SAMPLING WEIGHTS - NHANES III PHASE 1 (1988-91)
    ------------------------------------------------------------------------
    Positions            Item description
    SAS name    Counts       and code                               Notes
    ------------------------------------------------------------------------

         131-139           Phase 1 interviewed sample final         See note
      WTPFQX1              weight
                  14833    000461.29-264557.81
                  14481    Blank

         140-148           Phase 1 MEC-examined sample              See note
      WTPFEX1              final weight
                    229    000000.00
                  14604    000527.01-281557.44
                  14481    Blank

         149-157           Phase 1 MEC and home-examined sample     See note
      WTPFHX1              final weight
                  14833    000513.14-279489.83
                  14481    Blank

         158-166           Phase 1 allergy subsample final weight   See note
      WTPFALG1       14    000000.00
                   6097    000821.62-577795.82
                  23203    Blank

         167-175           Phase 1 central nervous system (CNS)     See note
      WTPFCNS1             subsample final weight
                      8    000000.00
                   2751    002699.84-591652.96
                  26555    Blank

         176-184           Phase 1 morning session MEC-examined     See note
      WTPFSD1              subsample fnal weight
                    451    000000.00
                   4462    001111.36-585181.93
                  24401    Blank

         185-193           Phase 1 afternoon/evening session MEC-   See note
      WTPFMD1              examined subsample final weight
                    322    000000.00
                   4726    001104.11-506697.07
                  24266    Blank



                        NHANES III Laboratory Data File
                   Whole Blood, Serum, Plasma, and Urine Data

    ------------------------------------------------------------------------
                                DEMOGRAPHIC DATA
    ------------------------------------------------------------------------
                SAMPLING WEIGHTS - NHANES III PHASE 1 (1988-91)
    ------------------------------------------------------------------------
    Positions            Item description
    SAS name    Counts       and code                               Notes
    ------------------------------------------------------------------------

         194-202           Phase 1 morning session MEC and home-    See note
      WTPFHSD1             examined subsample final weight
                    373    000000.00
                   4540    0001091.8-582959.83
                  24401    Blank

         203-211           Phase 1 afternoon/evening session MEC    See note
      WTPFHMD1             and home-examined subsample final weight
                    264    000000.00
                   4784    001085.73-507417.05
                  24266    Blank



                        NHANES III Laboratory Data File
                   Whole Blood, Serum, Plasma, and Urine Data

    ------------------------------------------------------------------------
                                DEMOGRAPHIC DATA
    ------------------------------------------------------------------------
                SAMPLING WEIGHTS - NHANES III PHASE 2 (1991-94)
    ------------------------------------------------------------------------
    Positions            Item description
    SAS name    Counts       and code                               Notes
    ------------------------------------------------------------------------

         212-220           Phase 2 interviewed sample final         See note
      WTPFQX2              weight
                  14481    000431.06-243267.38
                  14833    Blank

         221-229           Phase 2 MEC-examined sample              See note
      WTPFEX2              final weight
                    228    000000.00
                  14253    000426.91-262887.56
                  14833    Blank

         230-238           Phase 2 MEC and home-examined sample     See note
      WTPFHX2              final weight
                  14481    0000428.5-262188.52
                  14833    Blank

         239-247           Phase 2 allergy subsample final weight   See note
      WTPFALG2        9    000000.00
                   6009    000426.91-552445.57
                  23296    Blank

         248-256           Phase 2 central nervous system (CNS)     See note
      WTPFCNS2             subsample final weight
                      4    000000.00
                   2911    002632.92-518040.33
                  26399    Blank

         257-265           Phase 2 morning session MEC-examined     See note
      WTPFSD2              subsample fnal weight
                    469    000000.00
                   4665    0000901.9-550430.69
                  24180    Blank

         266-274           Phase 2 afternoon/evening session MEC-   See note
      WTPFMD2              examined subsample final weight
                    375    000000.00
                   4771    000990.26-512403.98
                  24168    Blank



                        NHANES III Laboratory Data File
                   Whole Blood, Serum, Plasma, and Urine Data

    ------------------------------------------------------------------------
                                DEMOGRAPHIC DATA
    ------------------------------------------------------------------------
                SAMPLING WEIGHTS - NHANES III PHASE 2 (1991-94)
    ------------------------------------------------------------------------
    Positions            Item description
    SAS name    Counts       and code                               Notes
    ------------------------------------------------------------------------

         275-283           Phase 2 morning session MEC and home-    See note
      WTPFHSD2             examined subsample final weight
                    418    000000.00
                   4714    000892.98-552545.64
                  24182    Blank

         284-292           Phase 2 afternoon/evening session MEC    See note
      WTPFHMD2             and home-examined subsample final weight
                    298    000000.00
                   4846    001007.13-512490.71
                  24170    Blank



                        NHANES III Laboratory Data File
                   Whole Blood, Serum, Plasma, and Urine Data

    ------------------------------------------------------------------------
                                DEMOGRAPHIC DATA
    ------------------------------------------------------------------------
       FAY'S BRR REPLICATE INTERVIEW WEIGHTS - TOTAL NHANES III (1988-94)
    ------------------------------------------------------------------------
    Positions            Item description
    SAS name    Counts       and code                               Notes
    ------------------------------------------------------------------------

         293-301           Replicate 1 final interview weight       See note
      WTPQRP1     29314    000053.27-148435.02

         302-310           Replicate 2 final interview weight       See note
      WTPQRP2     29314    000067.13-143746.82

         311-319           Replicate 3 final interview weight       See note
      WTPQRP3     29314    000047.49-152075.62

         320-328           Replicate 4 final interview weight       See note
      WTPQRP4     29314    000062.62-137241.93

         329-337           Replicate 5 final interview weight       See note
      WTPQRP5     29314    000048.42-147700.94

         338-346           Replicate 6 final interview weight       See note
      WTPQRP6     29314    0000053.1-146803.63

         347-355           Replicate 7 final interview weight       See note
      WTPQRP7     29314    000058.18-145261.07

         356-364           Replicate 8 final interview weight       See note
      WTPQRP8     29314    000048.23-161126.44

         365-373           Replicate 9 final interview weight       See note
      WTPQRP9     29314    000053.27-147301.59

         374-382           Replicate 10 final interview weight      See note
      WTPQRP10    29314    000073.37-0148125.5

         383-391           Replicate 11 final interview weight      See note
      WTPQRP11    29314    000058.31-146940.58

         392-400           Replicate 12 final interview weight      See note
      WTPQRP12    29314    000053.67-153958.72

         401-409           Replicate 13 final interview weight      See note
      WTPQRP13    29314    000067.93-147395.78



                        NHANES III Laboratory Data File
                   Whole Blood, Serum, Plasma, and Urine Data

    ------------------------------------------------------------------------
                                DEMOGRAPHIC DATA
    ------------------------------------------------------------------------
       FAY'S BRR REPLICATE INTERVIEW WEIGHTS - TOTAL NHANES III (1988-94)
    ------------------------------------------------------------------------
    Positions            Item description
    SAS name    Counts       and code                               Notes
    ------------------------------------------------------------------------

         410-418           Replicate 14 final interview weight      See note
      WTPQRP14    29314    000065.08-138456.05

         419-427           Replicate 15 final interview weight      See note
      WTPQRP15    29314    000062.35-140673.55

         428-436           Replicate 16 final interview weight      See note
      WTPQRP16    29314    000040.28-147603.74

         437-445           Replicate 17 final interview weight      See note
      WTPQRP17    29314    000045.36-154057.83

         446-454           Replicate 18 final interview weight      See note
      WTPQRP18    29314    000070.42-138896.98

         455-463           Replicate 19 final interview weight      See note
      WTPQRP19    29314    000050.96-139447.18

         464-472           Replicate 20 final interview weight      See note
      WTPQRP20    29314    000045.79-156365.73

         473-481           Replicate 21 final interview weight      See note
      WTPQRP21    29314    000049.79-146241.31

         482-490           Replicate 22 final interview weight      See note
      WTPQRP22    29314    000047.25-0154848.6

         491-499           Replicate 23 final interview weight      See note
      WTPQRP23    29314    000037.18-148309.04

         500-508           Replicate 24 final interview weight      See note
      WTPQRP24    29314    000057.42-141344.14

         509-517           Replicate 25 final interview weight      See note
      WTPQRP25    29314    000044.13-145105.09

         518-526           Replicate 26 final interview weight      See note
      WTPQRP26    29314    0000066.1-146773.53



                        NHANES III Laboratory Data File
                   Whole Blood, Serum, Plasma, and Urine Data

    ------------------------------------------------------------------------
                                DEMOGRAPHIC DATA
    ------------------------------------------------------------------------
       FAY'S BRR REPLICATE INTERVIEW WEIGHTS - TOTAL NHANES III (1988-94)
    ------------------------------------------------------------------------
    Positions            Item description
    SAS name    Counts       and code                               Notes
    ------------------------------------------------------------------------

         527-535           Replicate 27 final interview weight      See note
      WTPQRP27    29314    000044.88-142455.25

         536-544           Replicate 28 final interview weight      See note
      WTPQRP28    29314    000000046-148272.41

         545-553           Replicate 29 final interview weight      See note
      WTPQRP29    29314    000079.38-153624.57

         554-562           Replicate 30 final interview weight      See note
      WTPQRP30    29314    000058.09-151140.25

         563-571           Replicate 31 final interview weight      See note
      WTPQRP31    29314    000051.39-159963.39

         572-580           Replicate 32 final interview weight      See note
      WTPQRP32    29314    000066.17-132356.37

         581-589           Replicate 33 final interview weight      See note
      WTPQRP33    29314    0000057.8-136762.37

         590-598           Replicate 34 final interview weight      See note
      WTPQRP34    29314    000062.28-140628.16

         599-607           Replicate 35 final interview weight      See note
      WTPQRP35    29314    000063.73-154630.49

         608-616           Replicate 36 final interview weight      See note
      WTPQRP36    29314    000067.29-153648.69

         617-625           Replicate 37 final interview weight      See note
      WTPQRP37    29314    000043.47-135065.98

         626-634           Replicate 38 final interview weight      See note
      WTPQRP38    29314    000054.55-152122.87

         635-643           Replicate 39 final interview weight      See note
      WTPQRP39    29314    000050.55-152941.69



                        NHANES III Laboratory Data File
                   Whole Blood, Serum, Plasma, and Urine Data

    ------------------------------------------------------------------------
                                DEMOGRAPHIC DATA
    ------------------------------------------------------------------------
       FAY'S BRR REPLICATE INTERVIEW WEIGHTS - TOTAL NHANES III (1988-94)
    ------------------------------------------------------------------------
    Positions            Item description
    SAS name    Counts       and code                               Notes
    ------------------------------------------------------------------------

         644-652           Replicate 40 final interview weight      See note
      WTPQRP40    29314    000054.45-146815.92

         653-661           Replicate 41 final interview weight      See note
      WTPQRP41    29314    000059.62-141514.78

         662-670           Replicate 42 final interview weight      See note
      WTPQRP42    29314    000068.97-0140162.4

         671-679           Replicate 43 final interview weight      See note
      WTPQRP43    29314    000044.04-150981.83

         680-688           Replicate 44 final interview weight      See note
      WTPQRP44    29314    000040.36-144080.03

         689-697           Replicate 45 final interview weight      See note
      WTPQRP45    29314    000054.74-0142465.6

         698-706           Replicate 46 final interview weight      See note
      WTPQRP46    29314    000078.43-137838.21

         707-715           Replicate 47 final interview weight      See note
      WTPQRP47    29314    000052.71-145055.34

         716-724           Replicate 48 final interview weight      See note
      WTPQRP48    29314    000046.91-148787.77

         725-733           Replicate 49 final interview weight      See note
      WTPQRP49    29314    0000072.4-148375.43

         734-742           Replicate 50 final interview weight      See note
      WTPQRP50    29314    000070.53-159394.39

         743-751           Replicate 51 final interview weight      See note
      WTPQRP51    29314    000054.73-0144964.3

         752-760           Replicate 52 final interview weight      See note
      WTPQRP52    29314    000072.04-149087.24



                        NHANES III Laboratory Data File
                   Whole Blood, Serum, Plasma, and Urine Data

    ------------------------------------------------------------------------
                                DEMOGRAPHIC DATA
    ------------------------------------------------------------------------
      FAY'S BRR REPLICATE EXAMINATION WEIGHTS - TOTAL NHANES III (1988-94)
    ------------------------------------------------------------------------
    Positions            Item description
    SAS name    Counts       and code                               Notes
    ------------------------------------------------------------------------

         761-769           Replicate 1 final exam weight            See note
      WTPXRP1       457    000000.00
                  28857    000054.73-164698.81

         770-778           Replicate 2 final exam weight            See note
      WTPXRP2       457    000000.00
                  28857    0000067.3-164887.24

         779-787           Replicate 3 final exam weight            See note
      WTPXRP3       457    000000.00
                  28857    0000048.2-0161201.8

         788-796           Replicate 4 final exam weight            See note
      WTPXRP4       457    000000.00
                  28857    000067.24-149561.18

         797-805           Replicate 5 final exam weight            See note
      WTPXRP5       457    000000.00
                  28857    000055.97-146312.81

         806-814           Replicate 6 final exam weight            See note
      WTPXRP6       457    000000.00
                  28857    000051.48-156250.53

         815-823           Replicate 7 final exam weight            See note
      WTPXRP7       457    000000.00
                  28857    000060.06-0157694.3

         824-832           Replicate 8 final exam weight            See note
      WTPXRP8       457    000000.00
                  28857    0000053.1-169111.97

         833-841           Replicate 9 final exam weight            See note
      WTPXRP9       457    000000.00
                  28857    000052.31-156939.22

         842-850           Replicate 10 final exam weight           See note
      WTPXRP10      457    000000.00
                  28857    000072.13-0165805.2



                        NHANES III Laboratory Data File
                   Whole Blood, Serum, Plasma, and Urine Data

    ------------------------------------------------------------------------
                                DEMOGRAPHIC DATA
    ------------------------------------------------------------------------
      FAY'S BRR REPLICATE EXAMINATION WEIGHTS - TOTAL NHANES III (1988-94)
    ------------------------------------------------------------------------
    Positions            Item description
    SAS name    Counts       and code                               Notes
    ------------------------------------------------------------------------

         851-859           Replicate 11 final exam weight           See note
      WTPXRP11      457    000000.00
                  28857    000053.54-154918.93

         860-868           Replicate 12 final exam weight           See note
      WTPXRP12      457    000000.00
                  28857    000055.35-164023.88

         869-877           Replicate 13 final exam weight           See note
      WTPXRP13      457    000000.00
                  28857    0000067.9-147355.32

         878-886           Replicate 14 final exam weight           See note
      WTPXRP14      457    000000.00
                  28857    000067.04-154034.72

         887-895           Replicate 15 final exam weight           See note
      WTPXRP15      457    000000.00
                  28857    000062.21-156384.73

         896-904           Replicate 16 final exam weight           See note
      WTPXRP16      457    000000.00
                  28857    000000040-157994.12

         905-913           Replicate 17 final exam weight           See note
      WTPXRP17      457    000000.00
                  28857    000048.34-160889.46

         914-922           Replicate 18 final exam weight           See note
      WTPXRP18      457    000000.00
                  28857    0000075.2-153937.93

         923-931           Replicate 19 final exam weight           See note
      WTPXRP19      457    000000.00
                  28857    000056.83-149483.14

         932-940           Replicate 20 final exam weight           See note
      WTPXRP20      457    000000.00
                  28857    0000045.1-165457.71



                        NHANES III Laboratory Data File
                   Whole Blood, Serum, Plasma, and Urine Data

    ------------------------------------------------------------------------
                                DEMOGRAPHIC DATA
    ------------------------------------------------------------------------
      FAY'S BRR REPLICATE EXAMINATION WEIGHTS - TOTAL NHANES III (1988-94)
    ------------------------------------------------------------------------
    Positions            Item description
    SAS name    Counts       and code                               Notes
    ------------------------------------------------------------------------

         941-949           Replicate 21 final exam weight           See note
      WTPXRP21      457    000000.00
                  28857    000055.15-152305.97

         950-958           Replicate 22 final exam weight           See note
      WTPXRP22      457    000000.00
                  28857    000045.53-159746.13

         959-967           Replicate 23 final exam weight           See note
      WTPXRP23      457    000000.00
                  28857    000037.51-158016.62

         968-976           Replicate 24 final exam weight           See note
      WTPXRP24      457    000000.00
                  28857    000054.91-153043.54

         977-985           Replicate 25 final exam weight           See note
      WTPXRP25      457    000000.00
                  28857    000043.77-155179.51

         986-994           Replicate 26 final exam weight           See note
      WTPXRP26      457    000000.00
                  28857    000071.23-168273.22

         995-1003          Replicate 27 final exam weight           See note
      WTPXRP27      457    000000.00
                  28857    000043.82-153212.25

        1004-1012          Replicate 28 final exam weight           See note
      WTPXRP28      457    000000.00
                  28857    000045.61-147920.01

        1013-1021          Replicate 29 final exam weight           See note
      WTPXRP29      457    000000.00
                  28857    000083.17-159279.49

        1022-1030          Replicate 30 final exam weight           See note
      WTPXRP30      457    000000.00
                  28857    000059.05-162389.35



                        NHANES III Laboratory Data File
                   Whole Blood, Serum, Plasma, and Urine Data

    ------------------------------------------------------------------------
                                DEMOGRAPHIC DATA
    ------------------------------------------------------------------------
      FAY'S BRR REPLICATE EXAMINATION WEIGHTS - TOTAL NHANES III (1988-94)
    ------------------------------------------------------------------------
    Positions            Item description
    SAS name    Counts       and code                               Notes
    ------------------------------------------------------------------------

        1031-1039          Replicate 31 final exam weight           See note
      WTPXRP31      457    000000.00
                  28857    000052.61-163894.16

        1040-1048          Replicate 32 final exam weight           See note
      WTPXRP32      457    000000.00
                  28857    000067.05-0149876.8

        1049-1057          Replicate 33 final exam weight           See note
      WTPXRP33      457    000000.00
                  28857    000055.58-153417.47

        1058-1066          Replicate 34 final exam weight           See note
      WTPXRP34      457    000000.00
                  28857    000063.45-156981.83

        1067-1075          Replicate 35 final exam weight           See note
      WTPXRP35      457    000000.00
                  28857    000064.47-157897.09

        1076-1084          Replicate 36 final exam weight           See note
      WTPXRP36      457    000000.00
                  28857    000067.68-171875.06

        1085-1093          Replicate 37 final exam weight           See note
      WTPXRP37      457    000000.00
                  28857    000045.36-153137.39

        1094-1102          Replicate 38 final exam weight           See note
      WTPXRP38      457    000000.00
                  28857    000055.94-159979.02

        1103-1111          Replicate 39 final exam weight           See note
      WTPXRP39      457    000000.00
                  28857    000057.47-151920.72

        1112-1120          Replicate 40 final exam weight           See note
      WTPXRP40      457    000000.00
                  28857    000057.86-157191.41



                        NHANES III Laboratory Data File
                   Whole Blood, Serum, Plasma, and Urine Data

    ------------------------------------------------------------------------
                                DEMOGRAPHIC DATA
    ------------------------------------------------------------------------
      FAY'S BRR REPLICATE EXAMINATION WEIGHTS - TOTAL NHANES III (1988-94)
    ------------------------------------------------------------------------
    Positions            Item description
    SAS name    Counts       and code                               Notes
    ------------------------------------------------------------------------

        1121-1129          Replicate 41 final exam weight           See note
      WTPXRP41      457    000000.00
                  28857    0000061.4-000146023

        1130-1138          Replicate 42 final exam weight           See note
      WTPXRP42      457    000000.00
                  28857    000069.57-154624.02

        1139-1147          Replicate 43 final exam weight           See note
      WTPXRP43      457    000000.00
                  28857    000044.35-159439.04

        1148-1156          Replicate 44 final exam weight           See note
      WTPXRP44      457    000000.00
                  28857    000044.16-155951.73

        1157-1165          Replicate 45 final exam weight           See note
      WTPXRP45      457    000000.00
                  28857    000059.87-147941.67

        1166-1174          Replicate 46 final exam weight           See note
      WTPXRP46      457    000000.00
                  28857    000074.92-150980.02

        1175-1183          Replicate 47 final exam weight           See note
      WTPXRP47      457    000000.00
                  28857    000050.64-151763.92

        1184-1192          Replicate 48 final exam weight           See note
      WTPXRP48      457    000000.00
                  28857    0000045.8-156115.62

        1193-1201          Replicate 49 final exam weight           See note
      WTPXRP49      457    000000.00
                  28857    000082.17-159609.54

        1202-1210          Replicate 50 final exam weight           See note
      WTPXRP50      457    000000.00
                  28857    000071.97-168153.71



                        NHANES III Laboratory Data File
                   Whole Blood, Serum, Plasma, and Urine Data

    ------------------------------------------------------------------------
                                DEMOGRAPHIC DATA
    ------------------------------------------------------------------------
      FAY'S BRR REPLICATE EXAMINATION WEIGHTS - TOTAL NHANES III (1988-94)
    ------------------------------------------------------------------------
    Positions            Item description
    SAS name    Counts       and code                               Notes
    ------------------------------------------------------------------------

        1211-1219          Replicate 51 final exam weight   See note
      WTPXRP51      457    000000.00
                  28857    000054.04-158632.23

        1220-1228          Replicate 52 final exam weight   See note
      WTPXRP52      457    000000.00
                  28857    000073.26-158493.21



                        NHANES III Laboratory Data File
                   Whole Blood, Serum, Plasma, and Urine Data

    ------------------------------------------------------------------------
                                DEMOGRAPHIC DATA
    ------------------------------------------------------------------------
                      HOUSEHOLD YOUTH QUESTIONNAIRE (HYQ)
    ------------------------------------------------------------------------
    Positions            Item description
    SAS name    Counts       and code                               Notes
    ------------------------------------------------------------------------

        1229-1232          Age in months at household youth     See note
      HYAITMO              interview
                  11138    0012-0204
                     14    8888  Blank but applicable
                  18162    Blank



                        NHANES III Laboratory Data File
                   Whole Blood, Serum, Plasma, and Urine Data

    ------------------------------------------------------------------------
                                DEMOGRAPHIC DATA
    ------------------------------------------------------------------------
                                MEC EXAMINATION
    ------------------------------------------------------------------------
    Positions            Item description
    SAS name    Counts       and code                               Notes
    ------------------------------------------------------------------------

             1233          Language used by sample person in MEC    See note
      MXPLANG     23936    1     English
                   3906    2     Spanish
                      3    3     Other
                   1469    Blank

             1234          Examination session for MEC    See note
      MXPSESSR             examinees
                  13643    1     Morning
                   9419    2     Afternoon
                   5795    3     Evening
                    457    Blank

             1235          Day of week of MEC exam
      MXPTIDW      2884    1     Sunday
                   2618    2     Monday
                   2503    3     Tuesday
                   2914    4     Wednesday
                   5466    5     Thursday
                   5082    6     Friday
                   7390    7     Saturday
                    457    Blank



                        NHANES III Laboratory Data File
                   Whole Blood, Serum, Plasma, and Urine Data

    ------------------------------------------------------------------------
                                DEMOGRAPHIC DATA
    ------------------------------------------------------------------------
                                MEC EXAMINATION
    ------------------------------------------------------------------------
    Positions            Item description
    SAS name    Counts       and code                               Notes
    ------------------------------------------------------------------------

        1236-1239          Age in months at MEC exam                See note
      MXPAXTMR    28751    0012-1079
                    106    1080  1080+ months
                    457    Blank



                        NHANES III Laboratory Data File
                   Whole Blood, Serum, Plasma, and Urine Data

    ------------------------------------------------------------------------
                                DEMOGRAPHIC DATA
    ------------------------------------------------------------------------
                                HOME EXAMINATION
    ------------------------------------------------------------------------
    Positions            Item description
    SAS name    Counts       and code                               Notes
    ------------------------------------------------------------------------

             1240          Day of week of home exam
      HXPTIDW        22    1     Sunday
                    111    2     Monday
                      6    3     Tuesday
                     16    4     Wednesday
                    123    5     Thursday
                    119    6     Friday
                     60    7     Saturday
                  28857    Blank

        1241-1244          Age in months at home exam     See note
      HXPAXTMR      410    0252-1079
                     47    1080  1080+ months
                  28857    Blank

             1245          Examination session for home  See note
      HXPSESSR             examinees
                    203    1     Morning
                    212    2     Afternoon
                     38    3     Evening
                      4    8     Blank but applicable
                  28857    Blank



                        NHANES III Laboratory Data File
                   Whole Blood, Serum, Plasma, and Urine Data

    ------------------------------------------------------------------------
                       PHLEBOTOMY SCREENING QUESTIONNAIRE
    ------------------------------------------------------------------------
    Positions            Item description
    SAS name    Counts       and code                               Notes
    ------------------------------------------------------------------------

             1246          Language         See note
      PHPLANG     25009    1     English
                   2736    2     Spanish
                   1569    8     Blank but applicable

             1247          Do you have hemophilia? This is a   See note
      PHPHEMO              hereditary blood-clotting disorder
                      9    1     Yes, subsequent fields blank
                  27736    2     No
                   1569    8     Blank but applicable

             1248          Within the past four weeks     See note
      PHPCHM2              have you received any cancer
                           chemotherapy treatment?
                     19    1     Yes, subsequent fields blank
                  27717    2     No
                   1569    8     Blank but applicable
                      9    Blank

             1249          Are you currently taking insulin?  See note
      PHPINSU       418    1     Yes
                  27298    2     No
                   1570    8     Blank but applicable
                     28    Blank

        1250-1254          Including your last meal and any
      PHPSNTI              snacks, at what time did you last
                           have anything at all to eat?
                  27701    00:00-23:59
                   1585    88888 Blank but applicable
                     28    Blank

             1255          Day participant last ate
      PHPSNDA     12604    1     Yesterday
                  15081    2     Today
                     16    3     Before yesterday
                   1585    8     Blank but applicable
                     28    Blank



                        NHANES III Laboratory Data File
                   Whole Blood, Serum, Plasma, and Urine Data

    ------------------------------------------------------------------------
                       PHLEBOTOMY SCREENING QUESTIONNAIRE
    ------------------------------------------------------------------------
    Positions            Item description
    SAS name    Counts       and code                               Notes
    ------------------------------------------------------------------------

             1256          Have you had anything to drink,
      PHPDRIN              other than water, after the time
                           you last ate?
                   3947    1     Yes
                  23754    2     No, subsequent drink fields blank
                   1585    8     Blank but applicable
                     28    Blank

        1257-1261          At what time did you last have
      PHPDRTI              anything at all to drink other than
                           water?
                   3947    00:00-23:57
                   1585    88888 Blank but applicable
                  23782    Blank

             1262          Day participant last drank
      PHPDRDA      1094    1     Yesterday
                   2853    2     Today
                   1585    8     Blank but applicable
                  23782    Blank

        1263-1267          Computed number of hours since last    See note
      PHPFAST              ate or drank
                  27700    00000-39.13
                   1586    88888 Blank but applicable
                     28    Blank

        1268-1272          Time of venipuncture      See note
      PHPBEST     27703    07:32-22:02
                   1583    88888 Blank but applicable
                     28    Blank



                        NHANES III Laboratory Data File
                   Whole Blood, Serum, Plasma, and Urine Data

    ------------------------------------------------------------------------
                                   HEMATOLOGY
    ------------------------------------------------------------------------
    Positions            Item description
    SAS name    Counts       and code                               Notes
    ------------------------------------------------------------------------

        1273-1277          White blood cell count     See note
      WCP         26372    01.75-71.35
                   2914    88888 Blank but applicable
                     28    Blank

        1278-1282          White blood cell count: SI
      WCPSI       26372    01.75-71.35
                   2914    88888 Blank but applicable
                     28    Blank

        1283-1287          Lymphocyte percent (Coulter)
      LMPPCNT     26370    003.2-083.2
                   2916    88888 Blank but applicable
                     28    Blank

        1288-1292          Mononuclear percent (Coulter)
      MOPPCNT     25924    00000-37.55
                   3362    88888 Blank but applicable
                     28    Blank

        1293-1297          Granulocyte percent (Coulter)
      GRPPCNT     25925    010.9-093.9
                   3361    88888 Blank but applicable
                     28    Blank

        1298-1302          Lymphocyte number (Coulter)   See note
      LMP         26370    00.35-048.1
                   2916    88888 Blank but applicable
                     28    Blank

        1303-1306          Mononuclear number (Coulter)   See note
      MOP         25924    0000-06.4
                   3362    8888  Blank but applicable
                     28    Blank

        1307-1311          Granulocyte number (Coulter)    See note
      GRP         25925    000.2-023.4
                   3361    88888 Blank but applicable
                     28    Blank



                        NHANES III Laboratory Data File
                   Whole Blood, Serum, Plasma, and Urine Data

    ------------------------------------------------------------------------
                                   HEMATOLOGY
    ------------------------------------------------------------------------
    Positions            Item description
    SAS name    Counts       and code                               Notes
    ------------------------------------------------------------------------

        1312-1315          Red blood cell count     See note
      RCP         26370    1.69-6.84
                   2916    8888  Blank but applicable
                     28    Blank

        1316-1319          Red blood cell count: SI
      RCPSI       26370    1.69-6.84
                   2916    8888  Blank but applicable
                     28    Blank

        1320-1324          Hemoglobin (g/dL)     See note
      HGP         26372    04.95-019.6
                   2914    88888 Blank but applicable
                     28    Blank

        1325-1329          Hemoglobin: SI (g/L)
      HGPSI       26372    049.5-00196
                   2914    88888 Blank but applicable
                     28    Blank

        1330-1334          Hematocrit (%)      See note
      HTP         26370    016.6-057.6
                   2916    88888 Blank but applicable
                     28    Blank

        1335-1339          Hematocrit: SI (L/L=1)
      HTPSI       26370    0.166-0.576
                   2916    88888 Blank but applicable
                     28    Blank

        1340-1344          Mean cell volume: SI (fL)   See note
      MVPSI       26371    051.2-122.8
                   2915    88888 Blank but applicable
                     28    Blank

        1345-1349          Mean cell hemoglobin: SI (pg)  See note
      MCPSI       26369    013.6-053.6
                   2917    88888 Blank but applicable
                     28    Blank



                        NHANES III Laboratory Data File
                   Whole Blood, Serum, Plasma, and Urine Data

    ------------------------------------------------------------------------
                                   HEMATOLOGY
    ------------------------------------------------------------------------
    Positions            Item description
    SAS name    Counts       and code                               Notes
    ------------------------------------------------------------------------

        1350-1354          Mean cell hemoglobin concentration   See note
      MHP                  (g/dL)
                  26369    25.95-52.35
                   2917    88888 Blank but applicable
                     28    Blank

        1355-1359          Mean cell hemoglobin
      MHPSI                concentration: SI (g/L)
                  26369    259.5-523.5
                   2917    88888 Blank but applicable
                     28    Blank

        1360-1364          Red cell distribution width (%)
      RWP         26372    007.8-31.95
                   2914    88888 Blank but applicable
                     28    Blank

        1365-1370          Red cell distribution width: SI
      RWPSI                (fraction)
                  26372    00.078-0.3195
                   2914    888888  Blank but applicable
                     28    Blank

        1371-1375          Platelet count     See note
      PLP         26367    014.5-00981
                   2919    88888 Blank but applicable
                     28    Blank

        1376-1380          Platelet count: SI
      PLPSI       26367    014.5-00981
                   2919    88888 Blank but applicable
                     28    Blank

        1381-1385          Platelet distribution width (%)
      DWP         26200    005.8-24.65
                   3086    88888 Blank but applicable
                     28    Blank



                        NHANES III Laboratory Data File
                   Whole Blood, Serum, Plasma, and Urine Data

    ------------------------------------------------------------------------
                                   HEMATOLOGY
    ------------------------------------------------------------------------
    Positions            Item description
    SAS name    Counts       and code                               Notes
    ------------------------------------------------------------------------

        1386-1390          Mean platelet volume: SI (fL)
      PVPSI       26373    00003-00043
                   2913    88888 Blank but applicable
                     28    Blank

        1391-1393          Segmented neutrophils (percent of 100    See note
      GRPDIF               cells)
                   8150    007-090
                   2276    888   Blank but applicable
                  18888    Blank

        1394-1396          Lymphocytes (percent of 100 cells)  See note
      LMPDIF       8150    004-088
                   2276    888   Blank but applicable
                  18888    Blank

        1397-1398          Monocytes (percent of 100 cells)  See note
      MOPDIF       8150    00-23
                   2276    88    Blank but applicable
                  18888    Blank

        1399-1400          Eosinophils (percent of 100 cells)  See note
      EOP          8150    00-51
                   2276    88    Blank but applicable
                  18888    Blank

        1401-1402          Basophils (percent of 100 cells)  See note
      BOP          8150    00-22
                   2276    88    Blank but applicable
                  18888    Blank

             1403          Blasts (percent of 100 cells)   See note
      BLP          8150    0
                   2276    8     Blank but applicable
                  18888    Blank

             1404          Promyelocytes (percent of 100 cells)  See note
      PRP          8150    0
                   2276    8     Blank but applicable
                  18888    Blank



                        NHANES III Laboratory Data File
                   Whole Blood, Serum, Plasma, and Urine Data

    ------------------------------------------------------------------------
                                   HEMATOLOGY
    ------------------------------------------------------------------------
    Positions            Item description
    SAS name    Counts       and code                               Notes
    ------------------------------------------------------------------------

             1405          Metamyelocytes (percent of 100 cells) See note
      MEP          8150    0-2
                   2276    8     Blank but applicable
                  18888    Blank

             1406          Myelocytes (percent of 100 cells)  See note
      MLP          8150    0-1
                   2276    8     Blank but applicable
                  18888    Blank

        1407-1408          Bands (percent of 100 cells)   See note
      BAP          8150    00-22
                   2276    88    Blank but applicable
                  18888    Blank

        1409-1410          Atypical lymphocytes (percent of 100   See note
      LAP                  cells)
                   8150    00-28
                   2276    88    Blank but applicable
                  18888    Blank

             1411          Anisocytosis (variation of cell size)  See note
      ANP          6120    0     Normal
                   2030    1-4  Gradation to abnormal
                   2276    8     Blank but applicable
                  18888    Blank

             1412          Basophilic stippling  See note
      BSP          8047    0     Normal
                    103    1-3  Gradation to abnormal
                   2276    8     Blank but applicable
                  18888    Blank

             1413          Hypochromia (stain intensity of cell)  See note
      HZP          6891    0     Normal
                   1259    1-4  Gradation to abnormal
                   2276    8     Blank but applicable
                  18888    Blank



                        NHANES III Laboratory Data File
                   Whole Blood, Serum, Plasma, and Urine Data

    ------------------------------------------------------------------------
                                   HEMATOLOGY
    ------------------------------------------------------------------------
    Positions            Item description
    SAS name    Counts       and code                               Notes
    ------------------------------------------------------------------------

             1414          Poikilocytosis (cell shape variation) See note
      PKP          7067    0     Normal
                   1083    1-4  Gradation to abnormal
                   2276    8     Blank but applicable
                  18888    Blank

             1415          Polychromatophilia (bluish color of cell)See note
      POP          7231    0     Normal
                    919    1-3  Gradation to abnormal
                   2276    8     Blank but applicable
                  18888    Blank

             1416          Macrocytosis (large cell prevalence) See note
      MRP          7569    0     Normal
                    581    1-3  Gradation to abnormal
                   2276    8     Blank but applicable
                  18888    Blank

             1417          Microcytosis (small cell prevalence) See note
      MIP          6873    0     Normal
                   1277    1-4  Gradation to abnormal
                   2276    8     Blank but applicable
                  18888    Blank

             1418          Sickle cells        See note
      SIP          8135    0     Normal
                     15    1-3  Gradation to abnormal
                   2276    8     Blank but applicable
                  18888    Blank

             1419          Spherocytosis     See note
      SHP          7479    0     Normal
                    671    1-4  Gradation to abnormal
                   2276    8     Blank but applicable
                  18888    Blank

             1420          Target cells        See note
      TTP          7620    0     Normal
                    530    1-4  Gradation to abnormal
                   2276    8     Blank but applicable
                  18888    Blank



                        NHANES III Laboratory Data File
                   Whole Blood, Serum, Plasma, and Urine Data

    ------------------------------------------------------------------------
                                   HEMATOLOGY
    ------------------------------------------------------------------------
    Positions            Item description
    SAS name    Counts       and code                               Notes
    ------------------------------------------------------------------------

             1421          Toxic granulation   See note
      TXP          7839    0     Normal
                    311    1-4  Gradation to abnormal
                   2276    8     Blank but applicable
                  18888    Blank

             1422          Vacuolated cells   See note
      VUP          8150    0     Normal
                   2276    8     Blank but applicable
                  18888    Blank



                        NHANES III Laboratory Data File
                   Whole Blood, Serum, Plasma, and Urine Data

    ------------------------------------------------------------------------
                           GENERAL BIOCHEMISTRY TESTS
    ------------------------------------------------------------------------
    Positions            Item description
    SAS name    Counts       and code                               Notes
    ------------------------------------------------------------------------

        1423-1426          Lead (ug/dL)
      PBP          2342    00.7  Below level of detection
                  24476    0001-71.8
                   2468    8888  Blank but applicable
                     28    Blank

        1427-1431          Lead: SI (umol/L)
      PBPSI        2342    0.034 Below level of detection
                  24476    0.048-3.465
                   2468    88888 Blank but applicable
                     28    Blank

        1432-1435          Protoporphyrin (ug/dL RBC)
      EPP         26706    0003-1008
                   2580    8888  Blank but applicable
                     28    Blank

        1436-1440          Protoporphyrin: SI (umol/L RBC)
      EPPSI       26706    00.05-17.94
                   2580    88888 Blank but applicable
                     28    Blank

        1441-1443          Serum iron (ug/dL)  See note
      FEP         26479    004-338
                   2807    888   Blank but applicable
                     28    Blank

        1444-1448          Serum iron: SI (umol/L)
      FEPSI       26479    00.72-60.54
                   2807    88888 Blank but applicable
                     28    Blank

        1449-1452          Serum TIBC (ug/dL)
      TIP         25802    0069-0866
                   3484    8888  Blank but applicable
                     28    Blank

        1453-1458          Serum TIBC: SI (umol/L)
      TIPSI       25802    012.36-0155.1
                   3484    888888  Blank but applicable
                     28    Blank



                        NHANES III Laboratory Data File
                   Whole Blood, Serum, Plasma, and Urine Data

    ------------------------------------------------------------------------
                           GENERAL BIOCHEMISTRY TESTS
    ------------------------------------------------------------------------
    Positions            Item description
    SAS name    Counts       and code                               Notes
    ------------------------------------------------------------------------

        1459-1462          Serum transferrin saturation (%) See note
      PXP         25770    00.8-98.5
                   3516    8888  Blank but applicable
                     28    Blank

        1463-1466          Serum ferritin (ng/mL)
      FRP            13    0002  Below level of detection
                  26380    0003-3059
                   2893    8888  Blank but applicable
                     28    Blank

        1467-1470          Serum ferritin: SI (ug/L)
      FRPSI          13    0002  Below level of detection
                  26380    0003-3059
                   2893    8888  Blank but applicable
                     28    Blank

        1471-1475          Serum folate (ng/mL)       See note
      FOP             1    000.1 Below level of detection
                  23704    000.4-00199
                   1937    88888 Blank but applicable
                   3672    Blank

        1476-1480          Serum folate: SI (nmol/L)
      FOPSI           1    000.2 Below level of detection
                  23704    000.9-450.9
                   1937    88888 Blank but applicable
                   3672    Blank

        1481-1484          RBC folate (ng/mL)  See note
      RBP         23404    0007-1755
                   2238    8888  Blank but applicable
                   3672    Blank

        1485-1490          RBC folate: SI (nmol/L)
      RBPSI       23404    0015.9-3976.8
                   2238    888888  Blank but applicable
                   3672    Blank



                        NHANES III Laboratory Data File
                   Whole Blood, Serum, Plasma, and Urine Data

    ------------------------------------------------------------------------
                           GENERAL BIOCHEMISTRY TESTS
    ------------------------------------------------------------------------
    Positions            Item description
    SAS name    Counts       and code                               Notes
    ------------------------------------------------------------------------

        1491-1496          Serum vitamin B12 (pg/mL)
      VBP         12024    000033-099999
                    722    888888  Blank but applicable
                  16568    Blank

        1497-1504          Serum vitamin B12: SI (pmol/L)
      VBPSI
                  12024    00024.35-73779.26
                    722    88888888  Blank but applicable
                  16568    Blank

        1505-1508          Serum vitamin C (mg/dL)   See note
      VCP         20636    0000-4.72
                   2408    8888  Blank but applicable
                   6270    Blank

        1509-1514          Serum vitamin C: SI (mmol/L)
      VCPSI       20636    000000-000268
                   2408    888888  Blank but applicable
                   6270    Blank

        1515-1518          Serum normalized calcium: SI (mmol/L)  See note
      ICPSI       16737    0.81-1.95
                   3022    8888  Blank but applicable
                   9555    Blank

        1519-1522          Serum total calcium: SI (mmol/L)
      CAPSI           4    1.06  Below level of detection
                  18490    1.57-3.29
                   1265    8888  Blank but applicable
                   9555    Blank

        1523-1526          Serum selenium (ng/mL)   See note
      SEP         18597    0039-0622
                   1619    8888  Blank but applicable
                   9098    Blank

        1527-1530          Serum selenium: SI (nmol/L)
      SEPSI       18597    00.5-07.9
                   1619    8888  Blank but applicable
                   9098    Blank



                        NHANES III Laboratory Data File
                   Whole Blood, Serum, Plasma, and Urine Data

    ------------------------------------------------------------------------
                           GENERAL BIOCHEMISTRY TESTS
    ------------------------------------------------------------------------
    Positions            Item description
    SAS name    Counts       and code                               Notes
    ------------------------------------------------------------------------

        1531-1533          Serum vitamin A (ug/dL)
      VAP         23274    002-259
                   2368    888   Blank but applicable
                   3672    Blank

        1534-1537          Serum vitamin A: SI (umol/L)
      VAPSI       23274    0.07-9.04
                   2368    8888  Blank but applicable
                   3672    Blank

        1538-1542          Serum vitamin E (ug/dL)  See note
      VEP         23274    00028-09999
                   2368    88888 Blank but applicable
                   3672    Blank

        1543-1548          Serum vitamin E: SI (umol/L)
      VEPSI       23274    000.65-232.18
                   2368    888888  Blank but applicable
                   3672    Blank

        1549-1551          Serum alpha carotene (ug/dL)
      ACP         23274    000-202
                   2368    888   Blank but applicable
                   3672    Blank

        1552-1555          Serum alpha carotene: SI (umol/L)
      ACPSI       23274    0000-3.76
                   2368    8888  Blank but applicable
                   3672    Blank

        1556-1559          Serum beta carotene (ug/dL)  See note
      BCP             5    0000  Below level of detection
                  23269    0001-0674
                   2368    8888  Blank but applicable
                   3672    Blank

        1560-1564          Serum beta carotene: SI (umol/L)
      BCPSI           5    00.00 Below level of detection
                  23269    00.02-12.56
                   2368    88888 Blank but applicable
                   3672    Blank


                        NHANES III Laboratory Data File
                   Whole Blood, Serum, Plasma, and Urine Data

    ------------------------------------------------------------------------
                           GENERAL BIOCHEMISTRY TESTS
    ------------------------------------------------------------------------
    Positions            Item description
    SAS name    Counts       and code                               Notes
    ------------------------------------------------------------------------

        1565-1567          Serum beta cryptoxanthin (ug/dL)
      BXP         23272    000-144
                   2370    888   Blank but applicable
                   3672    Blank

        1568-1571          Serum beta cryptoxanthin: SI (umol/L)
      BXPSI       23272    0000-02.6
                   2370    8888  Blank but applicable
                   3672    Blank

        1572-1574          Serum lutein/zeaxanthin (ug/dL)  See note
      LUP             3    000   Below level of detection
                  23271    001-478
                   2368    888   Blank but applicable
                   3672    Blank

        1575-1578          Serum lutein/zeaxanthin: SI (umol/L)
      LUPSI           3    0.00  Below level of detection
                  23271    0.02-08.4
                   2368    8888  Blank but applicable
                   3672    Blank

        1579-1581          Serum lycopene (ug/dL)  See note
      LYP            25    000   Below level of detection
                  23249    001-124
                   2368    888   Blank but applicable
                   3672    Blank

        1582-1585          Serum lycopene: SI (umol/L)
      LYPSI          25    0.00  Below level of detection
                  23249    0.02-2.31
                   2368    8888  Blank but applicable
                   3672    Blank

        1586-1588          Serum sum retinyl esters (ug/dL)
      REP         23274    000-269
                   2368    888   Blank but applicable
                   3672    Blank



                        NHANES III Laboratory Data File
                   Whole Blood, Serum, Plasma, and Urine Data

    ------------------------------------------------------------------------
                           GENERAL BIOCHEMISTRY TESTS
    ------------------------------------------------------------------------
    Positions            Item description
    SAS name    Counts       and code                               Notes
    ------------------------------------------------------------------------

        1589-1592          Serum sum retinyl esters: SI (umol/L)
      REPSI       23274    0000-9.39
                   2368    8888  Blank but applicable
                   3672    Blank

        1593-1597          Serum cotinine (ng/mL)                   See note
      COP           994    0.035 Below level of detection
                   9648    00.05-01470
                   2025    88888 Blank but applicable
                  16647    Blank

        1598-1600          Serum cholesterol (mg/dL)
      TCP         23561    059-702
                   2081    888   Blank but applicable
                   3672    Blank

        1601-1605          Serum cholesterol: SI (mmol/L)
      TCPSI       23561    01.53-18.15
                   2081    88888 Blank but applicable
                   3672    Blank

        1606-1609          Serum triglycerides (mg/dL) See note
      TGP         23515    0013-3616
                   2127    8888  Blank but applicable
                   3672    Blank

        1610-1614          Serum triglycerides: SI (mmol/L)
      TGPSI       23515    00.15-40.82
                   2127    88888 Blank but applicable
                   3672    Blank

        1615-1617          Serum LDL cholesterol (mg/dL)  See note
      LCP          7891    020-380
                   2254    888   Blank but applicable
                  19169    Blank

        1618-1621          Serum LDL cholesterol: SI (mmol/L)
      LCPSI        7891    0.52-9.83
                   2254    8888  Blank but applicable
                  19169    Blank



                        NHANES III Laboratory Data File
                   Whole Blood, Serum, Plasma, and Urine Data

    ------------------------------------------------------------------------
                           GENERAL BIOCHEMISTRY TESTS
    ------------------------------------------------------------------------
    Positions            Item description
    SAS name    Counts       and code                               Notes
    ------------------------------------------------------------------------

        1622-1624          Serum HDL cholesterol (mg/dL)
      HDP         23409    008-196
                   2233    888   Blank but applicable
                   3672    Blank

        1625-1628          Serum HDL cholesterol: SI (mmol/L)
      HDPSI       23409    0.21-5.07
                   2233    8888  Blank but applicable
                   3672    Blank

        1629-1631          Serum apolipoprotein AI (mg/dL)  See note
      AAP         11432    059-300
                   1464    888   Blank but applicable
                  16418    Blank

        1632-1635          Serum apolipoprotein AI: SI (g/L)
      AAPSI       11432    0.59-0003
                   1464    8888  Blank but applicable
                  16418    Blank

        1636-1638          Serum apolipoprotein B (mg/dL) See note
      ABP         11483    040-260
                   1413    888   Blank but applicable
                  16418    Blank

        1639-1642          Serum apolipoprotein B: SI (g/L)
      ABPSI       11483    00.4-02.6
                   1413    8888  Blank but applicable
                  16418    Blank

        1643-1645          Serum lipoprotein (a) (mg/dL)
      LPP         12018    000-276
                    728    888   Blank but applicable
                  16568    Blank

        1646-1649          Serum lipoprotein (a): SI (g/L)
      LPPSI       12018    0000-2.76
                    728    8888  Blank but applicable
                  16568    Blank



                        NHANES III Laboratory Data File
                   Whole Blood, Serum, Plasma, and Urine Data

    ------------------------------------------------------------------------
                           GENERAL BIOCHEMISTRY TESTS
    ------------------------------------------------------------------------
    Positions            Item description
    SAS name    Counts       and code                               Notes
    ------------------------------------------------------------------------

        1650-1654          Serum follicle stimulating hormone: SI
      FHPSI                (IU/L)
                      6    000.1 Below level of detection
                   3116    000.2-00170
                    253    88888 Blank but applicable
                  25939    Blank

        1655-1658          Serum luteinizing hormone: SI (IU/L)
      LHPSI           2    00.1  Below level of detection
                   3118    00.2-67.1
                    255    8888  Blank but applicable
                  25939    Blank

        1659-1662          Plasma fibrinogen (mg/dL)
      FBP          9350    0019-0957
                    810    8888  Blank but applicable
                  19154    Blank

        1663-1666          Plasma fibrinogen: SI (g/L)
      FBPSI        9350    0.19-9.57
                    810    8888  Blank but applicable
                  19154    Blank

        1667-1671          Serum C-reactive protein (mg/dL)
      CRP         16218    00.21 Below level of detection
                   6249    000.3-025.2
                   3175    88888 Blank but applicable
                   3672    Blank



                        NHANES III Laboratory Data File
                   Whole Blood, Serum, Plasma, and Urine Data

    ------------------------------------------------------------------------
                                 ANTIBODY TESTS
    ------------------------------------------------------------------------
    Positions            Item description
    SAS name    Counts       and code                               Notes
    ------------------------------------------------------------------------

        1672-1677          Serum tetanus antibody (U/mL)
      TEP         19336    000000-074.67
                   5849    888888  Blank but applicable
                   4129    Blank

             1678          Serum hepatitis A antibody
      AHP                  (anti-HAV)
                   9872    1     Positive
                  11376    2     Negative
                     12    3     Borderline
                   1784    8     Blank but applicable
                   6270    Blank

             1679          Serum hepatitis B core antibody  See note
      HBP                  (anti-HBc)
                   1368    1     Positive
                  19886    2     Negative
                     11    3     Borderline
                   1779    8     Blank but applicable
                   6270    Blank

        1680-1681          Serum hepatitis B surface antibody    See note
      SSP                  (anti-HBs)
                    593    01    Positive
                    160    02    Negative
                    108    03    Borderline
                    340    11    > 10 mIU
                    155    22    < 10 mIU
                   1856    88    Blank but applicable
                  26102    Blank

             1682          Serum hepatitis B surface antigen   See note
      SAP                  (HBsAg)
                     82    1     Positive
                   1292    2     Negative
                      1    3     Borderline
                   1837    8     Blank but applicable
                  26102    Blank



                        NHANES III Laboratory Data File
                   Whole Blood, Serum, Plasma, and Urine Data

    ------------------------------------------------------------------------
                                 ANTIBODY TESTS
    ------------------------------------------------------------------------
    Positions            Item description
    SAS name    Counts       and code                               Notes
    ------------------------------------------------------------------------

             1683          Serum hepatitis C antibody
      HCP                  (anti-HCV)
                    402    1     Positive
                  20796    2     Negative
                     43    4     Indeterminate
                   1803    8     Blank but applicable
                   6270    Blank

             1684          Serum hepatitis D antibody   See note
      DHP                  (anti-HDV)
                      3    1     Positive
                     76    2     Negative
                      4    8     Blank but applicable
                  29231    Blank

             1685          Serum herpes I antibody
      H1P          9843    1     Positive
                   3205    2     Negative
                     50    3     Indeterminate
                   3184    8     Blank but applicable
                  13032    Blank

             1686          Serum herpes II antibody
      H2P          3532    1     Positive
                   9476    2     Negative
                     86    3     Indeterminate
                   3188    8     Blank but applicable
                  13032    Blank

        1687-1691          Serum rubella antibody     See note
      RUP         21288    00000-72.91
                   2213    88888 Blank but applicable
                   5813    Blank

        1692-1695          Serum rubella antibody (IU)    See note
      RUPUNIT     21288    0000-1224
                   2213    8888  Blank but applicable
                   5813    Blank



                        NHANES III Laboratory Data File
                   Whole Blood, Serum, Plasma, and Urine Data

    ------------------------------------------------------------------------
                                 ANTIBODY TESTS
    ------------------------------------------------------------------------
    Positions            Item description
    SAS name    Counts       and code                               Notes
    ------------------------------------------------------------------------

        1696-1700          Serum varicella antibody    See note
      VRP         21288    00000-29.64
                   2213    88888 Blank but applicable
                   5813    Blank

        1701-1703          Serum toxoplasmosis antibody             See note
      TOP         17658    000-240
                   2558    888   Blank but applicable
                   9098    Blank

        1704-1708          Serum rheumatoid factor antibody
      RFP          5271    00000-40960
                    437    88888 Blank but applicable
                  23606    Blank

        1709-1713          Serum latex antibody (IU/mL)             See note
      L1P          5524    00000-47.48
                  23790    Blank

             1714          Serum helicobacter pylori antibody       See note
      HPP           848    1     Positive
                   1733    2     Negative
                    125    3     Equivocal
                  26608    Blank



                        NHANES III Laboratory Data File
                   Whole Blood, Serum, Plasma, and Urine Data

    ------------------------------------------------------------------------
                              BIOCHEMISTRY PROFILE
    ------------------------------------------------------------------------
    Positions            Item description
    SAS name    Counts       and code                               Notes
    ------------------------------------------------------------------------

        1715-1719          Serum sodium: SI (mmol/L)
      NAPSI       18723    123.4-177.5
                   1493    88888 Blank but applicable
                   9098    Blank

        1720-1723          Serum potassium: SI (mmol/L)
      SKPSI       18723    2.51-6.94
                   1493    8888  Blank but applicable
                   9098    Blank

        1724-1728          Serum chloride: SI (mmol/L)
      CLPSI       18723    076.2-121.6
                   1493    88888 Blank but applicable
                   9098    Blank

        1729-1730          Serum bicarbonate: SI (mmol/L)
      C3PSI       18721    04-53
                   1495    88    Blank but applicable
                   9098    Blank

        1731-1734          Serum total calcium (mg/dL)
      SCP         18722    06.6-15.4
                   1494    8888  Blank but applicable
                   9098    Blank

        1735-1739          Serum total calcium: SI (mmol/L)
      SCPSI       18722    01.65-03.85
                   1494    88888 Blank but applicable
                   9098    Blank

        1740-1743          Serum phosphorus (mg/dL)
      PSP         18723    01.5-10.5
                   1493    8888  Blank but applicable
                   9098    Blank

        1744-1748          Serum phosphorus: SI (mmol/L)
      PSPSI       18723    0.484-03.39
                   1493    88888 Blank but applicable
                   9098    Blank



                        NHANES III Laboratory Data File
                   Whole Blood, Serum, Plasma, and Urine Data

    ------------------------------------------------------------------------
                              BIOCHEMISTRY PROFILE
    ------------------------------------------------------------------------
    Positions            Item description
    SAS name    Counts       and code                               Notes
    ------------------------------------------------------------------------

        1749-1752          Serum uric acid (mg/dL)
      UAP         18723    00.2-15.9
                   1493    8888  Blank but applicable
                   9098    Blank

        1753-1757          Serum uric acid: SI (umol/L)
      UAPSI       18723    011.9-945.7
                   1493    88888 Blank but applicable
                   9098    Blank

        1758-1760          Serum glucose (mg/dL) See note
      SGP         18719    037-571
                   1497    888   Blank but applicable
                   9098    Blank

        1761-1765          Serum glucose: SI (mmol/L)
      SGPSI       18719    02.05-031.7
                   1497    88888 Blank but applicable
                   9098    Blank

        1766-1768          Serum blood urea nitrogen (mg/dL)
      BUP         18723    002-104
                   1493    888   Blank but applicable
                   9098    Blank

        1769-1773          Serum blood urea nitrogen: SI (mmol/L)
      BUPSI       18723    00.71-37.13
                   1493    88888 Blank but applicable
                   9098    Blank

        1774-1777          Serum total bilirubin (mg/dL)
      TBP         18723    0000-10.4
                   1493    8888  Blank but applicable
                   9098    Blank

        1778-1783          Serum total bilirubin: SI (umol/L)
      TBPSI       18723    000000-177.84
                   1493    888888  Blank but applicable
                   9098    Blank



                        NHANES III Laboratory Data File
                   Whole Blood, Serum, Plasma, and Urine Data

    ------------------------------------------------------------------------
                              BIOCHEMISTRY PROFILE
    ------------------------------------------------------------------------
    Positions            Item description
    SAS name    Counts       and code                               Notes
    ------------------------------------------------------------------------

        1784-1787          Serum creatinine (mg/dL)
      CEP         18722    00.3-13.9
                   1494    8888  Blank but applicable
                   9098    Blank

        1788-1793          Serum creatinine: SI (umol/L)
      CEPSI       18722    0026.5-1228.8
                   1494    888888  Blank but applicable
                   9098    Blank

        1794-1796          Serum iron (ug/dL)                       See note
      SFP         14056    000-464
                   1493    888   Blank but applicable
                  13765    Blank

        1797-1800          Serum iron: SI (umol/L)
      SFPSI       14056    0000-83.1
                   1493    8888  Blank but applicable
                  13765    Blank

        1801-1804          Serum cholesterol (mg/dL)   See note
      CHP         18721    0039-0748
                   1495    8888  Blank but applicable
                   9098    Blank

        1805-1810          Serum cholesterol: SI (mmol/L)
      CHPSI       18721    01.009-19.343
                   1495    888888  Blank but applicable
                   9098    Blank

        1811-1814          Serum triglycerides (mg/dL)  See note
      TRP         14056    0003-3900
                   1493    8888  Blank but applicable
                  13765    Blank

        1815-1820          Serum triglycerides: SI (mmol/L)
      TRPSI       14056    00.034-44.031
                   1493    888888  Blank but applicable
                  13765    Blank



                        NHANES III Laboratory Data File
                   Whole Blood, Serum, Plasma, and Urine Data

    ------------------------------------------------------------------------
                              BIOCHEMISTRY PROFILE
    ------------------------------------------------------------------------
    Positions            Item description
    SAS name    Counts       and code                               Notes
    ------------------------------------------------------------------------

        1821-1823          Serum aspartate aminotransferase: SI
      ASPSI                (U/L)
                  18723    006-517
                   1493    888   Blank but applicable
                   9098    Blank

        1824-1826          Serum alanine aminotransferase: SI
      ATPSI                (U/L)
                  18723    001-486
                   1493    888   Blank but applicable
                   9098    Blank

        1827-1830          Serum gamma glutamyl transferase: SI     See note
      GGPSI                (U/L)
                  14549    0001-1342
                   1495    8888  Blank but applicable
                  13270    Blank

        1831-1834          Serum lactate dehydrogenase: SI
      LDPSI                (U/L)
                  18721    0029-0970
                   1495    8888  Blank but applicable
                   9098    Blank

        1835-1838          Serum alkaline phosphatase: SI (U/L)
      APPSI       18721    0017-0952
                   1495    8888  Blank but applicable
                   9098    Blank

        1839-1842          Serum total protein (g/dL)
      TPP         18723    04.6-10.4
                   1493    8888  Blank but applicable
                   9098    Blank

        1843-1845          Serum total protein: SI (g/L)
      TPPSI       18723    046-104
                   1493    888   Blank but applicable
                   9098    Blank



                        NHANES III Laboratory Data File
                   Whole Blood, Serum, Plasma, and Urine Data

    ------------------------------------------------------------------------
                              BIOCHEMISTRY PROFILE
    ------------------------------------------------------------------------
    Positions            Item description
    SAS name    Counts       and code                               Notes
    ------------------------------------------------------------------------

        1846-1848          Serum albumin (g/dL)
      AMP         18723    0.9-6.1
                   1493    888   Blank but applicable
                   9098    Blank

        1849-1851          Serum albumin: SI (g/L)
      AMPSI       18723    009-061
                   1493    888   Blank but applicable
                   9098    Blank

        1852-1854          Serum globulin (g/dL)                    See note
      GBP         14056    1.5-6.6
                   1493    888   Blank but applicable
                  13765    Blank

        1855-1857          Serum globulin: SI (g/L)
      GBPSI       14056    015-066
                   1493    888   Blank but applicable
                  13765    Blank

        1858-1860          Serum osmolality: SI (mmol/Kg)           See note
      OSPSI       14056    241-352
                   1493    888   Blank but applicable
                  13765    Blank



                        NHANES III Laboratory Data File
                   Whole Blood, Serum, Plasma, and Urine Data

    ------------------------------------------------------------------------
                            DIABETES TESTING PROFILE
    ------------------------------------------------------------------------
    Positions            Item description
    SAS name    Counts       and code                               Notes
    ------------------------------------------------------------------------

        1861-1864          Glycated hemoglobin: (%)                 See note
      GHP         23476    02.8-16.2
                   2166    8888  Blank but applicable
                   3672    Blank

             1865          Glycated hemoglobin: test method         See note
      GHPMETH     13892    1     Diamat method (instrument 1)
                   4811    2     Diamat method (instrument 2)
                   2549    3     Diamat method (instrument 3)
                   2224    4     Affinity method
                   2166    8     Blank but applicable
                   3672    Blank

        1866-1869          Glycated hemoglobin: hemoglobin F        See note
      GHPPCT               percentage
                    321    0000-68.4
                   2166    8888  Blank but applicable
                  26827    Blank

             1870          Glycated hemoglobin: hemoglobin S        See note
      GHPHBS               present
                  22943    N     No
                    533    Y     Yes
                   2166    8     Blank but applicable
                   3672    Blank

        1871-1875          Plasma glucose - first venipuncture      See note
      G1P                  (mg/dL)
                  15877    035.4-642.6
                    674    88888 Blank but applicable
                  12763    Blank

        1876-1881          Plasma glucose - first venipuncture: SI
      G1PSI                (mmol/L)
                  15877    01.965-35.671
                    674    888888  Blank but applicable
                  12763    Blank



                        NHANES III Laboratory Data File
                   Whole Blood, Serum, Plasma, and Urine Data

    ------------------------------------------------------------------------
                            DIABETES TESTING PROFILE
    ------------------------------------------------------------------------
    Positions            Item description
    SAS name    Counts       and code                               Notes
    ------------------------------------------------------------------------

        1882-1883          Incomplete glucose test (OGTT) code      See note
      G1PCODE         2    20    Hemophiliac
                     11    21    Chemotherapy within 4 weeks
                    301    22    Diabetic on insulin
                     98    23    Refused venipuncture
                     42    24    Ill/faint during test
                    142    25    Venipuncture unsuccessful
                     12    26    Physician canceled test
                    187    27    Refused glucose challenge
                    368    99    All remaining reasons
                  28151    Blank

        1884-1886          Minutes between glucose challenge and    See note
      G1PTIM1              second venipuncture
                   6640    086-178
                    855    888   Blank but applicable
                  21819    Blank

        1887-1889          Minutes between first and second         See note
      G1PTIM2              venipuncture
                   6637    094-184
                    858    888   Blank but applicable
                  21819    Blank

        1890-1894          Plasma glucose - second venipuncture     See note
      G2P                  (mg/dL)
                   6652    033.7-755.1
                    843    88888 Blank but applicable
                  21819    Blank

        1895-1900          Plasma glucose - second venipuncture: SI
      G2PSI                (mmol/L)
                   6652    01.871-41.916
                    843    888888  Blank but applicable
                  21819    Blank



                        NHANES III Laboratory Data File
                   Whole Blood, Serum, Plasma, and Urine Data

    ------------------------------------------------------------------------
                            DIABETES TESTING PROFILE
    ------------------------------------------------------------------------
    Positions            Item description
    SAS name    Counts       and code                               Notes
    ------------------------------------------------------------------------

        1901-1905          Serum C-peptide - first venipuncture     See note
      C1P                  (pmol/mL)
                     63    0.021 Below level of detection
                  15730    00.03-12.77
                    758    88888 Blank but applicable
                  12763    Blank

        1906-1910          Serum C-peptide - first venipuncture: SI
      C1PSI                (nmol/L)
                     63    0.021 Below level of detection
                  15730    00.03-12.77
                    758    88888 Blank but applicable
                  12763    Blank

        1911-1916          Serum C-peptide - second venipuncture    See note
      C2P                  (pmol/mL)
                      1    00.021  Below level of detection
                   3365    00.075-15.363
                    381    888888  Blank but applicable
                  25567    Blank

        1917-1922          Serum C-peptide - second venipuncture:
      C2PSI                SI (nmol/L)
                      1    00.021  Below level of detection
                   3365    00.075-15.363
                    381    888888  Blank but applicable
                  25567    Blank

        1923-1928          Serum insulin - first venipuncture       See note
      I1P                  (uU/mL)
                     65    001.76  Below level of detection
                  15689    002.51-002367
                    797    888888  Blank but applicable
                  12763    Blank

        1929-1935          Serum insulin - first venipuncture: SI
      I1PSI                (pmol/L)
                     65    0010.56  Below level of detection
                  15689    0015.06-0014202
                    797    8888888  Blank but applicable
                  12763    Blank



                        NHANES III Laboratory Data File
                   Whole Blood, Serum, Plasma, and Urine Data

    ------------------------------------------------------------------------
                            DIABETES TESTING PROFILE
    ------------------------------------------------------------------------
    Positions            Item description
    SAS name    Counts       and code                               Notes
    ------------------------------------------------------------------------

             1936          Serum insulin - first venipuncture:      See note
      I1P2PFLG             test kit
                   2693    1     Kit 1
                   1906    2     Kit 2
                  11156    3     Kit 3
                    796    8     Blank but applicable
                  12763    Blank

        1937-1942          Serum insulin - second venipuncture      See note
      I2P                  (uU/mL)
                   3378    0002.7-823.01
                    369    888888  Blank but applicable
                  25567    Blank

        1943-1949          Serum insulin - second venipuncture: SI
      I2PSI                (pmol/L)
                   3378    00016.2-4938.06
                    369    8888888  Blank but applicable
                  25567    Blank



                        NHANES III Laboratory Data File
                   Whole Blood, Serum, Plasma, and Urine Data

    ------------------------------------------------------------------------
                                  URINE TESTS
    ------------------------------------------------------------------------
    Positions            Item description
    SAS name    Counts       and code                               Notes
    ------------------------------------------------------------------------

        1950-1954          Urinary cadmium (ng/mL)
      UDP         22321    00.01-16.65
                    749    88888 Blank but applicable
                   6244    Blank

        1955-1960          Urinary cadmium: SI (nmol/L)
      UDPSI       22321    000.09-148.14
                    749    888888  Blank but applicable
                   6244    Blank

        1961-1965          Urinary creatinine (mg/dL)  See note
      URP            83    007.9 Below level of detection
                  22162    011.3-682.1
                    825    88888 Blank but applicable
                   6244    Blank

        1966-1969          Urinary creatinine: SI (mmol/L)
      URPSI          83    00.7  Below level of detection
                  22162    0001-60.3
                    825    8888  Blank but applicable
                   6244    Blank

        1970-1975          Urinary albumin (ug/mL)
      UBP           386    0000.4  Below level of detection
                  21859    0000.5-015700
                    825    888888  Blank but applicable
                   6244    Blank

        1976-1982          Urinary iodine (ug/dL)
      UIP             5    00000.1  Below level of detection
                  22085    00000.5-0019750
                    980    8888888  Blank but applicable
                   6244    Blank


DEMOGRAPHIC DATA:  NOTES


Screener Questionnaire


DMPSTAT:  Examination/interview status

     This variable identifies the interview or examination status of all
     persons selected for the NHANES III sample.  Interviewed persons completed
     preselected questions in specific sections of the Household Adult or
     Youth Questionnaires.  Mobile examination center (MEC)-examined persons
     were interviewed and successfully completed at least one examination
     component in the MEC.  Home-examined persons were interviewed and
     successfully completed at least one home examination component.  The
     home examination was an option for frail older adults, infants 2-11
     months of age, and other adults who were unable to come to the MEC.


DMARETHN:  Race-ethnicity

     This key analytic variable, based on the NHANES III survey design, was
     derived from many sources of data and is based on reported race and
     ethnicity.  The other category includes all Hispanics, regardless of
     race, who were not Mexican-American and also includes all non-Hispanics
     from racial groups other than white or black.


DMARACER: Race

     This variable was obtained from two primary sources: the Screener and
     the Family Questionnaires.  Prior to the selection of the sample, race
     (Black, White, Other) was self-reported or reported by proxy in the
     Screener Questionnaire.  During the administration of the Family
     Questionnaire, race was self-reported or reported by the respondent of
     the Family Questionnaire from five categories (Aleut, Eskimo, American
     Indian, Asian or Pacific Islander, Black, White, Other).  Responses from
     the two sources were adjudicated, as necessary, to create a three level
     variable (Black, White, Other).


DMAETHNR:  Ethnicity

     This variable was obtained from two primary sources: the Screener and
     the Family Questionnaires.  As part of both interviews, hand cards were
     used to determine Mexican/Mexican-American or Other Latin
     American/Spanish ancestry or national origin.  Responses of non-Hispanic
     ancestry or national origin were categorized as other.  Responses from
     the two interviews were adjudicated, as necessary, and this three
     level variable was created.


HSAGEIR:  Age (Screener Questionnaire)

     Age was calculated using the birth date which was obtained from the
     Screener Questionnaire.  The variable HSAGEU provides the age unit
     (months or years) for HSAGEIR.  Ages of 90 years or greater were recoded
     into a single category of 90+ years to help protect the confidentiality
     of survey participants.


HSAITMOR:  Age in months (Screener Questionnaire)

     Age in months was calculated by computing number of months between the
     Screener Questionnaire date and date of birth.  This variable was
     created for analyses where exact age at the interview may be needed.
     HSAITMOR differs slightly from the age in years (HSAGEIR), the variable
     most often used for analyses.  Ages of 1080 months and older (90 years
     and older) were recoded into a single category of 1080+ months to
     protect the confidentiality of survey participants.


HSFSIZER:  Family Size

     Family size represents the total number of related persons living in a
     household (single dwelling unit).  All household members were rostered
     by family during the Screener interview.  Household members who were
     related to the family reference person (knowledgeable household member
     17 years or older who owned or rented the dwelling unit) by blood or
     marriage were considered part of the family.  Adopted children, foster-
     and god-children were also included, if they were living in the dwelling
     unit.  However, family members who were away at college, or living
     independently were not included.  Other household members who were
     unrelated to the reference person were considered members of separate
     families.  Families with 10 members or more were recoded into a single
     response category of 10+ persons to help protect confidentiality.  See
     note for Household Size (HSHSIZER).


HSHSIZER: Household Size

     Household size represents the total number of persons living in a single
     dwelling unit, both related and unrelated.  All permanent household
     members were rostered according to their family as part the Screener
     interview.  This was done in order to obtain a complete list of all
     persons living or staying in the dwelling unit, and to distinguish
     household and family members.  Households with 10 members or more were
     recoded into a single response category of 10+ persons to help protect
     confidentiality.  See note for Family Size (HFHSIZER).


DMPCNTYR: County FIPS codes for United States counties with populations of
          500,000 and more

     These county FIPS codes identify large counties with populations of
     500,000 and more that were sampled in the survey.  Counties with
     population less than 500,000 are not included to prevent identification
     of these locations.  See Appendix 1 for listing of codes.


DMPFIPSR: State FIPS codes for United States counties with populations of
          500,000 and more

     These state FIPS codes identify counties with populations of 500,000+
     that were sampled in the survey.  Counties with population less than
     500,000 are not included to prevent identification of these locations.
     See Appendix 1 for listing of codes.


DMPMETRO: Urbanization classification based on USDA Rural-Urban
          continuum codes

     These classifications are based on the USDA Rural-Urban codes (Butler and
     Beale, 1993) that describe metro and nonmetro counties by degree of
     urbanization and nearness to metro areas.  The USDA codes were recoded
     into two categories to prevent identification of counties that were
     sampled in the survey.


DMPCREGN: Census region

     The United States was divided into four broad geographic regions as
     defined by the Bureau of Census.  Because all states were not included in
     the selected sample, regional estimates may not be representative for a
     given region.


DMPPIR: Poverty income ratio (or poverty index)

     The poverty income ratio (PIR) was computed as a ratio of two
     components.  The numerator was the midpoint of the observed family
     income category in the Family Questionnaire variable:HFF19R.  The
     denominator was the poverty threshold, the age of the family reference
     person, and the calender year in which the family was interviewed.

     Poverty threshold values (in dollars) are produced annually by the
     Census Bureau (Series P-60).  These threshold values are based on
     calendar years and adjusted for changes caused by inflation between
     calendar years.  Reports for each of the calendar years in the survey
     (1988-94) were used in the calculation of PIR.  For the years 1991 and
     1994, data from preliminary reports were used.  The poverty income ratio
     allows income data to be analyzed in a comparable manner across the six
     years of the survey and with previous NHANES.

     Persons who reported having had no income and were assigned a zero value
     for PIR.  A substantial proportion of persons refused to report their
     income or income category during the Family Questionnaire.  Due to the
     income nonresponse the potential for bias in PIR may be high.  Users are
     cautioned to examine potential nonresponse bias for PIR and
     other income variables.


Survey Design Data


SDPPHASE:  Phase of NHANES III survey

     For operational purposes, 81 primary sampling units were divided into 89
     survey locations (or stands) and randomly allocated to two three-year
     phases.  Phase 1 data were collected from October 1988 through October
     1991 and Phase 2 data were collected from October 1991 through October
     1994.


SDPSTRA6, SDPSTRA1, SDPSTRA2, and SDPPSU6, SDPPSU1, SDPPSU2: 
           Pseudo strata codes and pseudo PSU pair codes

     Because NHANES III was based upon a complex sample design, the
     assumptions of many statistical tests and routinely available
     statistical programs are not met.  For this reason, when estimates of
     the variances of statistics are computed, the technique of estimation
     must be based upon complex sampling theory.  In order to provide users
     with the capability of estimating the complex sample variances, 49
     pseudo strata and a pair of Primary Sampling Unit (PSU) codes per
     stratum were designed.

     A software package, "SUDAAN- Software for the Statistical Analysis of
     Correlated Data" (Shah, 1995), was developed by the Research Triangle
     Institute to analyze complex sample design data like NHANES.  SUDAAN
     uses strata and PSU codes to conduct analysis with two PSU per stratum
     design.  Therefore, definition of pseudo strata and PSU provided in this
     data file should be used to compute complex sample variances in
     analyses.  Other software available for estimation of complex sample
     variance may also be used.  For further discussion of methods of
     variance estimation in NHANES III, see additional information on this
     subject in Weighting and Estimation Methodology (U.S. DHHS, 1996) and
     NHANES III Analytic and Reporting Guidelines (U.S. DHHS, 1996).


Sampling Weights

WTPFQX6, WTPFQX1, WTPFQX2: Total NHANES III and phase-specific final
                           interview weights

     These sampling weights should be used only for items collected during
     the household interviews.  To compute final interview weights, final
     basic weights were first adjusted for nonresponse to household
     interview, then post-stratified to the unpublished Current Population
     Survey 1990 (Phase 1) and 1993 (Phase 2) population control estimates of
     the U.S. population adjusted for undercount.  For details, see
     Weighting and Estimation Methodology (U.S. DHHS, 1996) and NHANES III
     Analytic and Reporting Guidelines (U.S. DHHS, 1996).


WTPFEX6, WTPFEX1, WTPFEX2: Total NHANES III and phase-specific final MEC
                           examination weights

     These MEC sampling weights should be used for analysis of measurements
     or interview items collected in the MEC.  Persons who were not examined
     in the MEC have a sampling weight of zero and should be excluded from
     analyses.  To compute final MEC examination weights, final interview
     weights were first adjusted for nonresponse to MEC examinations, then
     post-stratified to the unpublished Current Population Survey 1990
     (Phase 1) and 1993 (Phase 2) population control estimates of the U.S.
     population adjusted for undercount.  For details, see Weighting and
     Estimation Methodology(U.S. DHHS, 1996) and NHANES III Analytic and
     Reporting Guidelines (U.S. DHHS, 1996).


WTPFHX6, WTPFHX1, WTPFHX2: Total NHANES III and phase-specific MEC+home
                           examination weights

     These MEC+home sampling weights should be used for analysis of the
     examination items where measurements or interview items were collected
     in the MEC and home.  Persons who were not examined in the MEC or home
     have a sampling weight of zero and should be excluded from analyses.  To
     compute final MEC+home examination weights, final interview weights were
     first adjusted for nonresponse to MEC and home examinations, then
     post-stratified to unpublished Current Population Survey 1990 (Phase 1)
     and 1993 (Phase 2) population control estimates of the U.S. population
     adjusted for undercount.  No separate sampling weights were computed for
     home examinees.  For details, see Weighting and Estimation Methodology
     (U.S. DHHS, 1996) and NHANES III Analytic and Reporting Guidelines
     (U.S. DHHS, 1996).


WTPFALG6, WTPFALG1, WTPFALG2: Total NHANES III and phase-specific allergy
                              examination subsample weights

     These subsample weights are for analysis of allergy measurements.
     Allergy skin reactivity tests were administered to all MEC-examined
     persons aged 6-19 years and a random half-sample of the adults aged
     20-59 years.  Eligible MEC-examined persons who did not complete the
     allergy tests have a sampling weight of zero and should be excluded from
     the analyses.  Final MEC examination weights were first adjusted for
     selection of the half-sample among adults (20-59 years), and
     post-stratified to the unpublished Current Population Survey 1990 (Phase
     1) and 1993 (Phase 2) population control estimates of the U.S.
     population adjusted for undercount in the final step.  For details, see
     Weighting and Estimation Methodology (U.S. DHHS, 1996) and NHANES III
     Analytic and Reporting Guidelines (U.S. DHHS, 1996).


WTPFCNS6, WTPFCNS1, WTPFCNS2: Total NHANES III and phase-specific central
                              nervous system (CNS) examination subsample 
                              final weights

     These subsample weights are for analysis of measurements from the
     Central Nervous System (CNS) test.  The CNS examination was administered
     to a random half-sample of the adults aged 20-69 years.  Eligible
     MEC-examined persons who did not complete CNS testing have a sampling
     weight of zero and should be excluded from the analyses.  Final MEC
     examination weights were first adjusted for selection of half sample
     among adults (20-59 years), and post-stratified to unpublished Current
     Population Survey 1990 (Phase 1) and 1993 (Phase 2) population control
     estimates of the U.S. population adjusted for undercount in the final
     step.  For details, see Weighting and Estimation Methodology
     (U.S. DHHS, 1996) and NHANES III Analytic and Reporting Guidelines
     (U.S. DHHS, 1996).


WTPFSD6, WTPFSD1, WTPFSD2: Total NHANES III and phase-specific morning
                           session MEC examination subsample final weights

     These subsample weights are for special analyses where fasting time may
     be an important factor.  They were computed for persons aged 12 years
     and older who were scheduled and examined in the MEC morning session.
     Sampled households in the survey were randomly assigned to one of two
     groups -- morning session ("standard") or afternoon/evening session
     ("modified") assignments.  All sample persons from a household received
     the same session assignment and were requested to schedule examinations
     for the assigned session.  Fasting instructions varied by age and
     session assignment (Plan and Operation of The Third National Health and
     Nutrition Examination Survey, 1988-94 , U.S. DHHS, 1996).  It should be
     noted that actual fasting time may have differed from the instructed
     fasting time and can be obtained from the variable PHPFAST in the NHANES
     III Laboratory Data  File.  To compute these weights, final MEC examination
     weights were first adjusted for the random half selection, then
     adjusted for the non-response to assigned session, and finally,
     post-stratified to the unpublished Current Population Survey 1990 and
     1993 Population control estimates of the U.S. population adjusted for
     undercount.  Eligible MEC-examined persons who were assigned to the morning
     session and examined in another session have a sampling weight of zero and
     should be excluded in analyses.  For details, see Weighting and Estimation
     Methodology (U.S. DHHS, 1996) and NHANES III Analytic and Reporting
     Guidelines (U.S. DHHS, 1996).


WTPFMD6, WTPFMD1, WTPFMD2: Total NHANES III and phase-specific afternoon/evening 
                           session MEC examination subsample final weights

     These subsample weights are for special analyses where fasting time
     might be an important factor.  They were computed for MEC examined
     persons aged 12 years and older who were scheduled and examined in the
     afternoon or evening sessions.  Sampled households in the survey were
     randomly assigned to one of two groups -- morning session ("standard")
     or afternoon/evening session ("modified") assignments.  All sample
     persons from a household received the same session assignment and were
     requested to schedule examinations for the assigned session.  Fasting
     instruction varied by age and session assignments (Plan and Operation
     of the Third National Health and Nutrition Examination Survey, 1988-94,
     U.S. DHHS, 1996).  It should be noted that actual fasting
     time may have differed from the instructed fasting time and can be
     obtained from the variable PHPFAST in the NHANES III Laboratory Data File.)
     compute these weights, final MEC examination weights were first adjusted
     for the random half selection, then adjusted for the nonresponse to
     assigned session, and finally, post-stratified to the unpublished Current
     Population Survey 1990 and 1993 population control estimates of the U.S.
     population adjusted for undercount.  Eligible MEC examined persons who were
     assigned to the afternoon or evening sessions and examined in
     another session have a sampling weight of zero and should be excluded in
     analyses.  For details, see Weighting and Estimation Methodology
     (U.S.DHHS, 1996) and NHANES III Analytic and Reporting Guidelines
     (U.S. DHHS, 1996).


WTPFHSD6, WTPFHSD1, WTPFHSD2: Total NHANES III and phase-specific morning
                              session MEC+home examination subsample final post
                              stratified weights

     These subsample weights are for special analyses where fasting time may
     be an important factor.  They were computed for MEC+home examined
     persons aged 12 years and older who were scheduled and examined in the
     morning session.  Sampled households in the survey were randomly
     assigned to one of two groups -- morning session ("standard") or
     afternoon/evening session ("modified") assignments.  All sample persons
     from a household received the same session assignment and were requested
     to schedule examinations for the assigned session.  Fasting instruction
     varied by age and session assignments (Plan and Operations of the Third
     National Health and Nutrition Examination Survey, 1988-94, U.S. DHHS,
     1996).  It should be noted that actual fasting time may have differed from
     the instructed  fasting time and can be obtained from the variable PHPFAST
     in the NHANES III Laboratory Data File.  To compute  these weights, final
     MEC+home examination weights were first adjusted for the random half
     selection, then adjusted for the nonresponse to assigned session, and
     finally, post-stratified to the unpublished Current Population Survey
     1990 and 1993 population control estimates of the U.S. population adjusted
     for undercount.  Eligible MEC+home examined persons who were assigned to
     the morning session and examined in another session have a sampling weight
     of zero and should be excluded in analyses.  For details, see Weighting and
     Estimation Methodology (U.S. DHHS, 1996) and NHANES III Analytic and
     Reporting Guidelines (U.S. DHHS, 1996).


WTPFHMD6, WTPFHMD1, WTPFHMD2: Total NHANES III and phase-specific afternoon/
                              evening MEC+home examination subsample final 
                              weights

     These subsample weights are for special analyses where fasting time may
     be an important factor.  They were computed for MEC+home examined
     persons aged 12 years and older who were scheduled and examined in the
     afternoon or evening sessions.  Sampled households in the survey were
     randomly assigned to one of two groups -- morning session ("standard")
     or afternoon/evening session ("modified") assignments.  All sample
     persons from a household received the same session assignment and were
     requested to schedule examinations for the assigned session.  Fasting
     instruction varied by age and session assignments (Plan and Operation
     of the Third National Health and Nutrition Examination Survey, U.S. DHHS,
     1996).  It should be noted that actual fasting time may have differed from
     the instructed fasting time.  The actual fasting time can be obtained from
     the variable PHPFAST in the NHANES III Laboratory Data File.  To compute
     these weights, final MEC+home examination weights were first adjusted for
     the random half selection, then adjusted for the nonresponse to assigned
     session, and finally, post-stratified to the unpublished Current Population
     Survey 1990 and 1993 population control estimates of the U.S. population
     adjusted for undercount.  Eligible MEC+home examined persons who were
     assigned to the afternoon or evening sessions and examined in another
     session have a sampling weight of zero and should be excluded in
     analyses.  For details, see Weighting and Estimation Methodology
     (U.S. DHHS, 1996) and NHANES III Analytic and Reporting Guidelines
     (U.S. DHHS, 1996).


WTPQRP1--WTPQRP52: Fay's BRR Replicate interview sample

     To allow for alternative methods to estimate variance, 52 replicate
     weights were computed using repeated sampling method where WESVAR or
     other software that use repeated samples, can be used for estimating
     variance.  Fay's method (see Fay, 1990; Judkins, 1990) was used to draw
     half samples and adjust sampling weights in each of the random half
     samples.  Sampling weights in one half sample were multiplied by the
     factor k=1.7 and in the other half sample by k=0.3 using the Fay's
     method.  After this adjustment, sampling weights were further adjusted
     for non-response and post-stratified using the same procedure as the
     final full sample interview weights.  These weights should be used only
     for estimating variance of items from the household adult and youth
     interviews.  For details, see Weighting and Estimation Methodology
     (U.S. DHHS, 1996) and NHANES III  Analytic and Reporting Guidelines
     (U.S. DHHS, 1996).


WTPXRP1--WTPXRP52: Fay's BRR Replicate weights for MEC- examined sample

     To allow for alternative methods to estimate variance, 52 replicate
     weights were computed using repeated sampling method where WESVAR or
     other BRR type software can be used to estimate variance.  Fay's method
     (see Fay, 1990; Judkins, 1990) was used to draw half samples and adjust
     sampling weights in each of the random half samples.  Sampling weights
     in one half sample were multiplied by the factor k=1.7 and in the other
     half sample by k=0.3 using Fay's method.  After this adjustment, weights
     were further adjusted for nonresponse and were post-stratified using the
     same procedure as the full sample final weights.  These weights should
     be used only for estimating variance of outcome measurements or
     interview items from the MEC Examination.  For details, see additional
     information on this subject in Weighting and Estimation Methodology
     (U.S. DHHS, 1996) and NHANES III Analytic and Reporting Guidelines (U.S.
     DHHS, 1996).


Household Youth Questionnaire


HYAITMO: Age in months (Household Youth Interview)

     Age in months was calculated by computing number of months between
     Household Youth Interview date and the date of birth.  It was created for
     special analyses where exact age at the interview may be needed. This
     computed age may be different from the self-reported age in HSAGEIR and
     HSAGEU, or HSAITMOR.  For most analyses, age reported in HSAGEIR (and
     HSAGEU) should be used.


MEC Examination


MXPLANG:  Language of MEC examination

     This variables designates the language of conduct for the MEC examination.
     questionnaires were designed to be implemented in a bilingual
     (English/Spanish) format so that respondents could to be interviewed in
     their preferred language.  When it was necessary to conduct an interview
     in a another language, a translator assisted the interviewer in
     administering the questionnaires.  These interviews were coded as other.


MXPSESSR: Examination session for MEC examinees

     This variable designates the period during the day that the examination
     occurred.  To increase response rates and allow flexibility, examinations
     were scheduled in three sessions:  morning, afternoon and evening.  On
     occasion, more than one session was attended in order to complete the full
     examination. In such a situation, the session was coded as the one when
     most of the examinations were completed.


MXPAXTMR:  Age in months at MEC examination

     Age in total months was created for special analyses where exact age at the
     examination may be needed (e.g., computation of growth charts).  It was
     calculated by computing number of months between examination date and the
     date of birth.  Some examinees may have had a birthday between household
     interview and examination so that this computed age at examination may
     differ slightly from the age reported in HSAGEIR (and HSAGEU), or HSAITMOR.
     For most analyses age reported in HSAGEIR (and HSAGEU) should be used.
     Ages of 1080 months and older (90 years and older) were recoded into a
     single category of 1080+ months to protect the confidentiality of survey
     participants.


Home Examination


HXPAXTMR:  Age in months at home examination

     Age in total months was created for special analyses where exact age at the
     examination may be needed (e.g., computation of growth charts).  It was
     calculated by computing number of months between examination date and the
     date of birth.  Some examinees may have had a birthday between household
     interview and examination so that this computed age at examination may
     differ slightly from the age reported in HSAGEIR (and HSAGEU), or HSAITMOR.
     For most analyses age reported in HSAGEIR (and HSAGEU) should be used.
     Ages of 1080 months and older (90 years and older) were recoded into a
     single category of 1080+ months to protect the confidentiality of survey
     participants.


HXPSESSR: Examination session for home examinees

     This variable designates the period during the day that the examination
     occurred.  To increase response rates and allow flexibility, examinations
     were scheduled in three sessions:  morning, afternoon and evening.  On
     occasion, more than one session was attended in order to complete the full
     examination. In such a situation, the session was coded as the one when
     most of the examinations were completed.


References

 1.  Butler MA, Beale CL. Rural-urban continuum codes for metro and nonmetro
     counties, 1993.  Agriculture and Rural Economy Division, Economic Research
     Services, U.S. Department of Agriculture, Staff Report No. AGES-9425, 1993.

 2.  Fay RE. VPLX: Variance Estimates for Complex Surveys. In: Proceedings of the
     Survey Research Methods section of the American Statistical Association, pp.
     266-271, 1990.

 3.  Judkins DR. Fay's method for variance estimation. Journal of Official Statistics
     6 (3):223-239. 1990.

 4.  U.S. Department of Health and Human Services(DHHS). National Center for Health
     Statistics.  NHANES III Reference Manuals and Reports (CD-ROM). Hyattsville,Md.:
     Centers for Disease Control and Prevention, 1996.  Available from National
     Technical Information Service (NTIS), Springfield,Va. (Acrobat.PDF format;
     includes access software: Adobe Systems Inc.  Acrobat Reader 2.1)

 5.  Shah BV, Barnwell BG, Bieler GS. SUDAAN User's Manual: Software for Analysis of
     Correlated Data, Release 6.04. Research Triangle Park, North Carolina. 1995.


Appendix 1.  State and county FIPS codes for areas with populations
             of 500,000 or more.

    DMPFIPSR   State            DMPCNTYR     County

    4          Arizona          13           Maricopa
    6          California       1            Alameda
    6          California       19           Fresno
    6          California       37           Los Angeles
    6          California       59           Orange
    6          California       71           San Bernardino
    6          California       73           San Diego
    6          California       85           Santa Clara
    6          California       111          Ventura
    12         Florida          25           Dade
    12         Florida          31           Duval
    12         Florida          99           Palm Beach
    17         Illinois         31           Cook
    25         Massachusetts    17           Middlesex
    26         Michigan         125          Oakland
    26         Michigan         163          Wayne
    29         Missouri         189          St Louis
    36         New York         29           Erie
    36         New York         47           Kings
    36         New York         59           Nassau
    36         New York         61           New York
    36         New York         81           Queens
    36         New York         119          Westchester
    39         Ohio             35           Cuyahoga
    39         Ohio             61           Hamilton
    42         Pennsylvania     3            Allegheny
    42         Pennsylvania     45           Delaware
    42         Pennsylvania     101          Philadelphia
    44         Rhode Island     7            Providence
    48         Texas            29           Bexar
    48         Texas            113          Dallas
    48         Texas            141          El Paso
    48         Texas            201          Harris
    48         Texas            439          Tarrant
    53         Washington       33           King


LABORATORY DATA: NOTES

AAP:  Serum apolipoprotein AI

     Apolipoprotein AI and apolipoprotein B results were measured only
     during 1988-1991.  Three different methods were used at different times
     to measure apolipoprotein AI and apolipoprotein B.  These were radial
     immunodiffusion (RID), rate immunonephelometry (INA), and the World
     Health Organization -International Federation of Clinical Chemistry
     (WHO-IFCC) method (Bachorik, 1994; Marcovina, 1991; Albers, 1989).
     Results using the RID and INA methods were adjusted to the WHO-IFCC
     method.


ABP:  Serum apolipoprotein B

     See note for AAP.


ANP:  Anisocytosis

     Microscopic examination (manual differential) of the peripheral blood
     spread on a glass slide utilized a stained blood film to perform a
     differential leukocyte count, evaluate red cell morphology, and
     estimate number of platelets.  Manual differential variables include
     segmented neutrophils, lymphocytes, monocytes, eosinophils, basophils,
     blasts, promyelocytes, metamyelocytes, myelocytes, bands, atypical
     lymphocytes, anisocytosis, basophilic stippling, hypochromia,
     poikilocytosis, polychromatophilia, macrocytosis, microcytosis, sickle
     cells, spherocytosis, target cells, toxic granulation, and vacuolated
     cells (GRPDIF,  LMPDIF,  MOPDIF,  EOP,  BAP,  BOP, BLP, PRP, MEP, MLP,
     BAP, LAP, ANP, BSP, HZP, PKP, POP, MRP, MIP, SIP, SHP, TTP, TXP, and
     VUP).

     In NHANES III, a manual differential was performed on a special
     subsample of examinees aged one year and older.  This manual
     differential was used for internal quality control purposes and to
     confirm abnormal hematology results.  This subsample was defined as a
     random 10-percent sample of all examined persons plus all examinees
     who had a predetermined high or low value for one or more of the
     following hematologic assessments:  white blood cell count (WBC), red
     blood cell count (RBC), hemoglobin, hematocrit, mean cell volume (MCV),
     mean cell hemoglobin (MCH), mean cell hemoglobin concentration (MCHC),
     red blood cell distribution width (RDW), platelet count, mean platelet
     volume (MPV), lymphocyte percentage, mononuclear percentage, or
     granulocyte percentage.  A table of predetermined high and low values
     for WBC, RBC, hemoglobin, hematocrit, MCV, MCH, MCHC, RDW, platelet
     count, MPV, lymphocyte percentage, mononuclear percentage, and
     granulocyte percentage is located in the Manual for Medical Technicians
     (U.S. DHHS, pp. 5-54 and 5-55, 1996).


BAP:  Band cells

     See note for ANP.


BCP:  Serum beta carotene

     The lower limit of detection (LOD) for beta carotene was 0.67 ug/dL.
     Using the LOD coding formula (detection limit divided by the square
     root of two), the calculated value to indicate that the serum beta
     carotene results were below the level of detection would be 0.48.  After
     rounding, the value of 0 (zero) was placed in the results field to
     indicate that the serum beta carotene was below 0.67 ug/dL.


BLP:  Blast cells

     See note for ANP.


BOP:  Basophil cells

     See note for ANP.


BSP:  Basophilic stippling

     See note for ANP.


C1P:  Serum C-peptide (first venipuncture)

     The specimen for this assay was obtained at the time of the initial
     venipuncture.  This result is available for all six years of the
     survey.

     Examinees aged 40-74 years who used insulin were excluded from the
     OGTT.  A first venipuncture was obtained, but the glucose challenge and
     second venipuncture were canceled.  In these instances, the variables
     G1P, C1P and I1P have a value, but the results G2P, C2P and I2P from the
     second venipuncture are blank-filled to indicate a medical exclusion.


C2P:  Serum C-peptide (second venipuncture)

     Post-glucose challenge levels of C-peptide and insulin for examinees
     who had an OGTT were measured only during 1991-1994.


CHP:  Serum cholesterol

     This value was obtained from the standard battery of biochemical
     assessments.  Use of the laboratory test result from the reference
     method (TCP), rather than the CHP value, is generally recommended.
     For most analyses of serum cholesterol, the appropriate variable to use
     will be TCP.  The value from the biochemistry profile (CHP) should not
     be used routinely.  Consult the Laboratory Procedures Used for NHANES
     III (U.S. DHHS, 1996) for the details.


COP:  Serum cotinine

     Only cotinine results from 1988-1991 are included in this field.


DHP:  Serum hepatitis D antibody

     Hepatitis B virus testing scheme:  From 1988-1991, all sera were
     tested for the core antibody to hepatitis B virus (anti-HBc).  If this
     test was positive, the sera were tested for the hepatitis B surface
     antigen (HBsAg) and hepatitis B surface antibody (anti-HBs).  If the
     HbsAg test was positive and the anti-HBs test was <10 mIU, then the
     antibody to hepatitis D virus (anti-HDV) test was performed.  If the
     HbsAg test was negative and the anti-HBs test was <10 mIU, then the
     anti-HBc test was repeated for confirmation.

     In June 1993, all sera were tested for both anti-HBc and anti-HBs.
     Sera testing positive for anti-HBc were tested further for HBsAg, and
     positive HBsAg samples were tested for anti-HDV.


EOP:  Eosinophil cells

     See note for ANP.


FEP:  Serum iron

     Laboratory methods differed between NHANES III and previous surveys.
     Therefore, results may not be comparable between surveys.  Consult the
     Laboratory Procedures Used for NHANES III (U.S. DHHS, 1996).


FOP:  Serum folate

     Laboratory methods differed between NHANES III and previous surveys.
     Therefore, results may not be comparable between surveys.  Consult the
     Laboratory Procedures Used for NHANES III (U.S. DHHS, 1996).


G1P:  Plasma glucose (first venipuncture)

     Plasma glucose was measured using the reference method on examinees
     aged 20 years and older.  Consult the Laboratory Procedures Used for
     NHANES III (U.S. DHHS, 1996) for details.

     During NHANES III, OGTT testing was conducted on MEC examinees aged
     40-74 years.  A random assignment was made prior to conducting the OGGT
     to determine who should receive a morning examination (NCHS, 1994; U.S.
     DHHS, 1996).  As a result, approximately half of the OGGT examinees
     received the morning OGTT after an overnight fast.  This subsample
     most closely conformed to the World Health Organization (WHO) criteria
     for OGTT testing to identify diabetes (WHO, 1995).  Therefore, this
     morning subsample is the NHANES III subsample that should be used to
     estimate the prevalence of diabetes and impaired glucose tolerance.
     People who reported a medical history of diabetes but who were not using
     insulin therapy were asked to conform to the fasting instructions for
     their examination session and were eligible for an OGTT if the age
     criteria were satisfied.  The morning sample weights (WTPFHSD6) for
     total NHANES III weights for the morning OGTT subsample should be used
     when weighting these data to generate national estimates.  Data from the
     afternoon and evening OGTTs do not conform to the WHO protocol for
     diagnosing diabetes or IGT and should not be used for these purposes.

     If an examinee was given an OGTT during an examination session other
     than the session assigned, that examinee's sample weight for the
     assigned session will be zero.  For example, if an examinee was
     selected for a morning OGTT but was tested in the afternoon, the
     examinee's morning sample weight for the OGTT will be zero.


G1PCODE:  Reasons for an incomplete glucose tolerance test

     The reason for which an examinee aged 40-74 years did not complete the
     OGTT was entered in this field.  This field either will contain an
     incomplete OGTT code or will be blank.  Examinees who responded
     affirmatively to the hemophilia question (code 20) or who received
     chemotherapy within the past four weeks (code 21) were excluded from
     venipuncture.  Examinees who reported on their examination day that
     they used insulin therapy (code 22) were excluded from the OGTT.  Codes
     23-27 were recoded from comments and  notations on the questionnaires
     and may not include complete data on these reasons.


G1PTIM1:  Interval between glucose drink and second venipuncture in minutes

     If an examinee was aged 40-74 years and received the OGTT, the time
     that the glucose drink was consumed and the time of the second
     venipuncture were recorded.  This variable contains the calculated time
     difference between the glucose drink consumption and the second
     venipuncture.


G1PTIM2:  Interval between first and second venipuncture in minutes

     If an examinee was aged 40-74 years and received the OGTT, two timed
     venipunctures were performed.  This variable contains the calculated
     time difference between the first and second venipunctures.


G2P:  Plasma glucose (second venipuncture)

     See notes for C1P and G1P.


GBP:  Serum globulin

     Globulin results were added to the protocol after NHANES III began.
     This result field was blank-filled for examinees who were examined
     prior to the start of testing.


GGPSI:  Serum gamma glutamyl transferase

     Gamma glutamyl transferase results were added to the protocol after
     NHANES III began.  This result field was blank-filled for examinees
     who were examined prior to the start of testing.


GHP:  Glycated hemoglobin (HbA1c)

     Glycohemoglobin measurements for NHANES III were performed by the
     Diabetes Diagnostic Laboratory at the University of Missouri --
     Columbia using the Diamat Analyzer System (Bio-Rad Laboratories,
     Hercules, CA).  This ion-exchange HPLC system measures HbA1c (a specific
     glycohemoglobin) and has demonstrated excellent, long-term precision
     (interassay CV's 2.0).  It was standardized to the reference method
     that was used for the Diabetes Control and Complications Trial (DCCT).
     Variant hemoglobins, including hemoglobin C, D, F, and elevated HbF,
     can interfere with HbA1c measurement by the Diamat HPLC.  Hemoglobin S
     in its heterozygous state does not interfere with this assay.  Although
     interferences usually can be detected by an abnormal Diamat
     chromatogram, HbA1c results for these specimens were not considered
     valid.  Therefore, samples containing hemoglobin variants or elevated
     HbF or samples that produce chromatograms indicating hemoglobin
     degradation were analyzed by an alternate method that used affinity
     chromatography to separate glycohemoglobin.  Affinity chromatographic
     methods were not affected by the presence of hemoglobin variants and
     were less sensitive to hemoglobin degradation due to improper sample
     handling.  The affinity method used also was standardized to the DCCT
     reference method.  Reasons for using the affinity method for an
     examinee's test included an extra peak on the chromatogram, hemoglobin
     C, elevated hemoglobin F, or other abnormal hemoglobin.


GHPHBS:  Sickle cell hemoglobin (S) phenotype

     Y indicates the presence of a sickle cell hemoglobin (S) phenotype on
     the Diamat chromatogram.  N indicates the absence of a sickle cell
     hemoglobin (S) phenotype on the Diamat chromatogram.  See note for
     GHPMETH.


GHPMETH:  Glycated hemoglobin method

     See note for GHP.


GHPPCT:  Fetal hemoglobin (F)

     The affinity method was used when the percentage of fetal hemoglobin
     (HbF) was greater than two percent.  For those cases, this variable
     shows the percentage of fetal hemoglobin.


GRP:  Granulocyte number

     Consult the Manual for Medical Technicians for the Coulter granulocyte
     number, lymphocyte number, mononuclear number, white blood cell count,
     red blood cell count, and platelet count units (U.S. DHHS, 1996).


GRPDIF:  Segmented neutrophil cells

     See note for ANP.


HBP:  Serum hepatitis B core antibody

     See note for DHP.


HGP:  Hemoglobin

     In NHANES I, NHANES II, and HHANES, determinations of red and white
     blood cell counts were made using a semiautomated cell counter
     (Coulter model FN).  Determinations of hemoglobin concentration (Hb)
     were made using a Coulter hemoglobinometer, and determinations of packed
     cell volume (PCV) were made using the microhematocrit centrifuge method.
     The hematologic indices MCH, MCHC, and MCV were calculated as follows:

          MCH = Hb/RBC
          MCHC = Hb/PCV
          MCV = PCV/RBC


     In NHANES III, these hematologic parameters were determined by using a
     fully automated Coulter S+JR hematology analyzer.  These analyzers
     measured the mean (red) cell volume (MCV) directly, utilizing a
     process of continuous integration of pulse heights divided by the pulse
     number; PCV values were calculated through the multiplication of MCV and
     RBC.

     Although it has been shown that identified errors in the
     microhematocrit method caused by plasma trapping and red cell
     dehydration approximately compensate each other (Bull, 1990), packing
     errors can occur in macrocytic anemia and can be considerable in sickle
     cell anemia, spherocytosis, and thalassemias (NCCLS, 1993).  Therefore,
     individual values for MCV, PCV ("hematocrit"), and MCHC from NHANES III
     cannot be compared directly to values from the previous NHANES.


HPP:  Serum Helicobacter pylori antibody

     H. pylori antibody testing was performed on surplus sera from children
     and adolescents aged 6-19 years.  This result field was blank-filled
     for examinees aged 6-19 years for whom surplus specimens were not
     available for testing.  Due to variability in the laboratory test
     (Pylori Stat, Whittaker Bioproducts, Inc.), 50 percent of the assays
     were repeated randomly.  There was a seven-percent error rate in which
     the first result (HPP) did not match the repeat result (HPQ).  The
     original result was kept if the controls on the ELISA plate were within
     the acceptable range.  Testing on adults will be performed at a later
     date using the same assay.


HTP:  Hematocrit

     See note for HGP.


HZP:  Hypochromia

     See note for ANP.


I1P:  Serum insulin (first venipuncture)

     This is the adjusted insulin value for examinees.  Most of the insulin
     values in NHANES III (1988-1991) were adjusted because the
     manufacturer of the laboratory testing kits changed during that period.
     An indicator of the kit number is located in the I1P2PFLG field (i.e., 1
     = Kit 1, 2 = Kit 2, and 3 = Kit 3).  All insulin values from Kit 1 and
     Kit 2 assays were adjusted linearly to match the Kit 3 numbers.  Further
     information on this adjustment procedure is available in the Laboratory
     Procedures Used for NHANES III (U.S. DHHS, 1996).


     The equations used to adjust the data were:

     Kit 3 = 0.787 (Kit 1) + 0.832      Equation 1
     Kit 3 = 0.597 (Kit 2) + 1.746      Equation 2

     The following steps were used to make the adjustment:

     1.  Equation 1 was applied to group 1 (Kit 1) data
     2.  Equation 2 was applied to group 2 (Kit 2) data
     3.  Group 3 data (Kit 3) were left unchanged.


     The time periods for the insulin kits were as follows:

     Group          Assay Period                  Assay Method

     1              10/88-01/05/90             Kit 1
     2              01/06/90-09/06/90          Kit 2
     3              11/01/90-end of study      Kit 3

     See note for C1P.


I1P2PFLG:  Insulin adjustment flag

     This field shows which kit was used for the original insulin
     measurement.


I2P:  Serum insulin (second venipuncture)

     See notes for C1P, C2P and I1P.


ICPSI:  Serum normalized calcium

     This variable contains the normalized calcium value derived from
     adjusting the measured ionized calcium for pH.  Consult the Laboratory
     Procedures Used for NHANES III (U.S. DHHS, 1996) for details.


L1P:  Serum latex antibody

     Latex antibody testing was performed on surplus sera from persons ages
     17-60 years who were examined in phase 1 (1988-
     91). This result field was blank-filled for examinees ages 17-60 years
     for whom surplus specimens were not available for testing.


LAP:  Atypical lymphocyte cells

     See note for ANP.


LCP:  Serum LDL cholesterol calculation

     The value for LDL was calculated by the Friedewald equation as
     follows:

     LDL = total cholesterol - high density cholesterol - triglyceride/5.


     Because the equation is not valid when serum triglyceride values
     exceed 400 mg/dL, the LDL is missing when serum triglyceride (TGP)
     exceeds 400 mg/dL.

     Serum LDL was calculated on examinees who were instructed to fast
     (ages 12 and older) and who did fast at least nine hours, were examined
     in the morning, and were randomly assigned to the morning fasting sample
     (WTPFHSD6 > 0). Therefore, LDL would be blank if examinees were aged
     less than 12 years, fasted fewer than nine hours, were examined in an
     afternoon or evening session, or were not randomly assigned to the
     morning session.  For the purpose of this calculation, the number of
     hours fasted was rounded to the nearest whole integer.

     For more information regarding this equation, refer to the Laboratory
     Procedures Used for NHANES III (U.S. DHHS, 1996).


LMP:  Lymphocyte number

     See note for GRP.


LMPDIF:  Lymphocyte cells

     See note for ANP.


LUP:  Serum lutein/zeaxanthin

     The lower limit of detection (LOD) for lutein/zeaxanthin was 0.43
     ug/dL.  Using the LOD coding formula (detection limit divided by the
     square root of two), the calculated value indicating that the serum
     lycopene results were below the level of detection would be 0.30.  After
     rounding, the value of 0 (zero) was placed in the results field to
     indicate that the serum lutein/zeaxanthin was below 0.43 ug/dL.


LYP:  Serum lycopene

     The lower limit of detection (LOD) for lycopene was 0.63 ug/dL.  Using
     the LOD coding formula (detection limit divided by the square root of
     two), the calculated value indicating that the serum lycopene results
     were below the level of detection would be 0.44.  After rounding, the
     value of 0 (zero) was placed in the results field to indicate that the
     serum lycopene was below 0.63 ug/dL.


MCPSI:  Mean cell hemoglobin

     See note for HGP.


MEP:  Metamyelocyte cells

     See note for ANP.


MHP:  Mean cell hemoglobin concentration

     See note for HGP.


MIP:  Microcytosis

     See note for ANP.


MLP:  Myelocyte cells

     See note for ANP.


MOP:  Mononuclear number

     See note for GRP.


MOPDIF:  Monocyte cells

     See note for ANP.


MRP:  Macrocytosis

     See note for ANP.


MVPSI:  Mean cell volume

     See note for HGP.


OSPSI:  Serum osmolality

     Results for osmolality were added to the protocol after NHANES III
     began.  This result field is blank-filled for examinees who were
     examined prior to the start of testing.


PHPBEST:  Time of venipuncture

     The time of venipuncture is expressed using the 24-hour clock system
     (military time) in which 01:00 corresponds to 1:00 a.m., 12:00
     corresponds to 12 noon, 13:00 corresponds to 1:00 p.m., and 00:00
     corresponds to 12 midnight.


PHPCHM2:  Within the past four weeks have you received any cancer
   chemotherapy treatment?

     All examinees who indicated at the time of venipuncture that they had
     received cancer chemotherapy treatment in the past two weeks (later
     this was changed to four weeks) were excluded from venipuncture.  For
     these examinees, results fields for blood-based analyses are
     blank-filled.


 PHPFAST:  Calculated fasting time in hours

     The fasting time was calculated using the time of venipuncture and the
     time the examinee last ate or drank (other than water).  This was
     determined using the snack/drink time and the corresponding day
     variables.  Fasting time is the elapsed interval between the time the
     examinee last ate or drank and the time of venipuncture.

     The following variables were used to calculate this variable:
     PHPSNTI, PHPSNDA, PHPDRIN, PHPDRTI, PHPDRDA, and  PHPBEST.  If the
     examinee drank only water since he/she last ate (PHPDRIN = 2), then the
     time and day the examinee last ate (PHPSNTI and PHPSNDA) were subtracted
     from the time and day of the venipuncture (PHPBEST).  The difference was
     the number of hours between the time the examinee last ate and the time
     of the venipuncture.

     If the examinee drank anything other than water (PHPDRIN = 1), then
     the time and day the examinee last drank (PHPDRTI and PHPDRDA) were
     subtracted from the time and day of the venipuncture (PHPBEST).  The
     difference was the number of hours between the time the examinee last
     drank and the time of the venipuncture.


PHPHEMO:  Do you have hemophilia?

     All examinees who indicated at the time of venipuncture that they had
     hemophilia, a hereditary blood-clotting disorder, were excluded from
     the venipuncture.  Results for blood analyses were blank-filled.


PHPINSU:  Are you currently taking insulin?

     See note for G1P and G1PCODE.


PHPLANG:  Language of the venipuncture screening questionnaire

     Both English and Spanish versions of the venipuncture screening
     questionnaire were used.  The language used depended on the preference
     of the examinee.  Translators, either hired or friends/family members,
     were available for examinees who spoke neither Spanish nor English.


PKP:  Poikilocytosis

     See note for ANP.


PLP:  Platelet count

     See note for GRP.


POP:  Polychromatophilia

     See note for ANP.


PRP:  Promyelocyte cells

     See note for ANP.

PXP:  Serum transferrin saturation

     This value was calculated as (FEP/ TIP) * 100.


RBP:  RBC folate

     See note for FOP.


RCP:  Red blood cell count

     See notes for HGP and GRP.


RUP:  Serum rubella antibody

     Rubella antibody data are reported both as an optical density index
     and in International Units.  The index was calculated by subtracting the
     absorbance of the control well from the absorbance of the antigen well
     (AG-NS) and dividing the difference by the cut-off value.  The cut-off
     value was calculated as the mean AG-NS value of duplicate 10 IU
     standards.  The equation used was:

     O.D. index  = (AG-NS)/Cut-off value

     An O.D. index greater than or equal to one indicates the presence of
     antibody.


RUPUNIT:  Serum rubella antibody (IU)

     Rubella antibody data are reported both as an optical density index
     and in International Units.  International Units were calculated based
     on a standard curve using a regression analysis of duplicate AG-NS
     values of 10, 40, & 100 IU standards and their squares.  An
     International Unit value greater than or equal to 10 indicates the
     presence of antibody.


SAP:  Serum hepatitis B surface antigen

     See note for HBP.


SEP:  Serum selenium

     Selenium values were measured on two Perkin-Elmer graphite furnace
     atomic absorption spectrophotometers (model 3030 and model 5100)
     during the six-year study.  Based on a comparability study using linear
     models, the results generated using the Model 5100 instrument (from
     12/07/90 to 1/13/95) were on average 4.3 percent higher than those from
     the Model 3030 instrument (used from 10/1/88 to 12/06/90).  Since the
     Model 5100 represented more precise measurements, the model 3030 data
     were adjusted to make them comparable to the Model 5100.  Perkin-Elmer
     Model 5100 Zeeman-corrected graphite furnace atomic absorption
     spectrophotometer testing began on 12/07/90.  All selenium values
     measured prior to 12/07/90 were adjusted to the AA5100 values.  The
     formula used was:

     New value = 16.795 + 0.902 * original value.

SFP:  Serum iron

     This value was obtained from the standard battery of biochemical
     assessments.  Use of the laboratory test result from the reference
     method (FEP), rather than the SFP value, is generally recommended.
     For most analyses of serum iron, the appropriate variable to use will be
     FEP.  The value from the biochemistry profile (SFP) should not be used
     routinely.  Consult the Laboratory Procedures Used for NHANES III
     (U.S. DHHS, 1996) for details.  Laboratory test results for SFP were
     added to the protocol after NHANES III began.  This result field was
     blank-filled for examinees who were examined prior to the start of
     testing.


SGP:  Serum glucose

     This value was obtained from the standard battery of biochemical
     assessments.  Use of the laboratory test result for plasma glucose
     from the reference method (G1P), rather than the SGP value, is generally
     recommended.  For most analyses, the appropriate variable to use will
     be G1P.  The value from the biochemistry profile (SGP) should not be
     used routinely.  Consult the Laboratory Procedures Used for NHANES III
     (U.S. DHHS, 1996) for details.


SHP:  Spherocytosis

     See note for ANP.


SIP:  Sickle cells

     See note for ANP.


SSP:  Serum hepatitis B surface antibody

     See note for HBP.


TGP:  Serum triglycerides

     Serum triglyceride levels were measured regardless of the examinee's
     fasting status.  Mean serum triglycerides and the distribution of
     serum triglycerides should be estimated only on examinees who did fast
     at least nine hours, were examined in the morning, and were randomly
     assigned to the morning fasting sample (WTPFHSD6 > 0).  For the
     purpose of this calculation, the number of hours fasted was rounded to
     the nearest whole integer.  Consult the Laboratory Procedures Used for
     NHANES III (U.S. DHHS, 1996) for details.


TOP:  Serum toxoplasmosis antibody

     The presence and quantity of antibody to Toxoplasma gondii in the test
     sample were determined by comparing the optical density of the test
     sample to a standard curve.  A standard curve was constructed using
     optical density readings from positive control sera obtained from a
     kit; these readings were calibrated to WHO Toxo 60 serum and read as
     International Units (IU/mL).  Those test samples exhibiting titer
     below 7 IU/mL indicated a non-significant level of antibody according to

     this technique; thus, they were considered to be negative, indicating no
     infection.  Those test samples with results greater than 6 IU/mL were
     considered to be positive, indicating infection at some undetermined
     time.


TRP:  Serum triglycerides

     This value was obtained from the standard battery of biochemical
     assessments.  Use of the laboratory test result from the reference
     method (TGP), rather than the TRP value, is generally recommended.
     For most analyses, the appropriate variable to use is TGP.  The value
     from the biochemistry profile (TRP) should not be used routinely.
     Consult the Laboratory Procedures Used for NHANES III (U.S. DHHS, 1996)
     for details.  Results for TRP were added to the protocol after NHANES
     III began.  This result field was blank-filled for examinees who were
     examined prior to the start of testing.


TTP:  Target cells

     See note for ANP.


TXP:  Toxic granulation

     See note for ANP.


URP:  Urinary creatinine

     Although the laboratory method detection limit for urinary creatinine
     is 1 mg/dL, all values below 10 mg/dL were considered "statistically
     suspect" and were coded as "below level of detection".


VCP:  Serum vitamin C

     For NHANES III, serum concentrations of vitamin C were measured using
     a total vitamin C, fully reduced method using high-performance liquid
     chromatography with electrochemical detection (HPLC-EC) analysis.
     This method differed from the  2,4-dinitrophenyl hydrazine colorimetric
     method used in the NHANES II study.  A comparison study of the two
     methods was carried out.  Linear regression analysis, by an error in
     both variables' technique, was used to compare the results obtained by
     the two methods; values for slope, intercept, and correlation
     coefficient were 0.881, 0.036, and 0.927, respectively, for 138
     singlet analyses.

     Serum concentrations obtained by HPLC-EC were lower than those
     obtained by the 2,4-DNPH method.  This difference was expected due to
     the increased specificity of the HPLC method.  Unlike colorimetric
     methods, HPLC separates uric acid and other potential interferers from
     ascorbate, thereby increasing accuracy and specificity.  The 2,4-DNPH
     method also measured endogenous diketogulonate, the product of the
     irreversible oxidation of dehydroascorbic acid.  This species was not
     measured by most HPLC methods and generally was not included in total
     vitamin C measurements since it has no vitamin C activity.  Because the
     laboratory method differed between NHANES III and NHANES II, the results
     from the two surveys are not comparable.


     Blocks of vitamin C data are missing due to an inadvertent misdilution
     of the ascorbic acid-serum ratio.


VEP:  Serum vitamin E

     The vitamin E value of 9999 was confirmed.


VRP:  Serum varicella antibody

     Varicella antibody data were reported as an optical density index.
     See note RUP for the index calculation.  The equation used was:

     O.D. index = (AG-NS)/Cut-off value

     The cut-off value was 0.1.  An O.D. index equal to or greater than one
     indicates the presence of antibody.


VUP:  Vacuolated cells

     See note for ANP.


WCP:  White blood cell count

     See note for HGP and GRP.


Appendix 1.  Blood and Urine Assessments by Specimen Type and Age Group

                       AGE GROUP

1-3 years              4-5 years          6-11 years
                       Whole blood

CBC (1)(5)             CBC (1) (5)        CBC (1) (5)
Differential smear     Differential       Differential
                        smear              smear
Lead (5)               Lead (5)           Lead (5)
Protoporphyrin (5)     Protoporphyrin (5) Protoporphyrin (5)
                       RBC folate         RBC folate
                       Glycated           Glycated
                       hemoglobin (5)     hemoglobin (5)

                       Serum

Iron (5)               Iron (5)           Iron (5)
TIBC (5)               TIBC (5)           TIBC (5)
Ferritin (5)           Ferritin (5)       Ferritin (5)
                       Folate (5)         Folate (5)
                       Apolipoprotein     Apolipoprotein
                        AI(4)(5)           AI(4)(5)
                       Apolipoprotein     Apolipoprotein
                        B(4)(5)            B(4)(5)
                       Cholesterol (5)    Cholesterol (5)
                       HDL/LDL (5)        HDL/LDL (5)
                       Triglycerides (5)  Triglycerides (5)
                       Lp(a)(2)(5)        Lp(a)(2)(5)
                       Cotinine (4)       Cotinine (4)
                       C-reactive         C-reactive
                        protein (5)        protein (5)
                       Vitamin A (5)      Vitamin A (5)
                       Carotenes (5)      Carotenes (5)
                       Retinyl esters (5) Retinyl esters (5)
                       Vitamin E (5)      Vitamin E (5)
                       Vitamin B12 (2)    Vitamin B12 (2)
                                          Helicobacter pylori (4)
                       Tetanus            Tetanus
                                          Vitamin C
                                          Hepatitis A


Appendix 1.  Blood and Urine Assessments by Specimen Type and Age Group
(continued)

                       AGE GROUP

 1-3 years              4-5 years          6-11 years
                        Serum (continued)

                                           Hepatitis B/delta
                                           Hepatitis C
                                           Hepatitis E
                                           Rubella (5)
                                           Varicella (5)

                       Urine

                                           Cadmium
                                           Creatinine
                                           Albumin
                                           Iodine


Appendix 1.  Blood and Urine Assessments by Specimen Type and Age Group
(continued)

                       AGE GROUP

 12-19 years                     20 years and older

                       Whole blood

CBC (1)(5)                       CBC (1)(5)
Differential smear               Differential smear
Lead (5)                         Lead (5)
Protoporphyrin (5)               Protoporphyrin (5)
                                 RBC folate
Glycated hemoglobin (5)          Glycated hemoglobin (5)

                       Serum

Iron (5)                         Iron (5)
TIBC (5)                         TIBC (5)
Ferritin (5)                     Ferritin (5)
Folate (5)                       Folate (5)
Apolipoprotein AI(4)(5)          Apolipoprotein AI(4)(5)
Apolipoprotein B(4)(5)           Apolipoprotein B(4)(5)
Cholesterol (5)                  Cholesterol (5)
HDL/LDL (5)                      HDL/LDL (5)
Triglycerides (5)                Triglycerides (5)
Lp(a)(2)(5)                      Lp(a)(2)(5)
Cotinine (4)                     Cotinine (4)
C-reactive protein (5)           C-reactive protein (5)
                                 Rheumatoid factor (60+)
Vitamin A (5)                    Vitamin A (5)
Carotenes (5)                    Carotenes (5)
Retinyl esters (5)               Retinyl esters (5)
Vitamin E (5)                    Vitamin E (5)
Vitamin B12 (2)                  Vitamin B12 (2)
Helicobacter pylori (4)
Tetanus                          Tetanus
Vitamin C                        Vitamin C
Hepatitis A                      Hepatitis A
Hepatitis B/delta                Hepatitis B/delta
Hepatitis C                      Hepatitis C
Hepatitis E                      Hepatitis E
Rubella (5)                      Rubella (5)
Varicella (5)                    Varicella (5)


Appendix 1.  Blood and Urine Assessments by Specimen Type and Age Group
(continued)

                       AGE GROUP

 12-19 years                     20 years and older

                          Serum

Diphtheria                       Diptheria
Herpes simplex I and II          Herpes simplex I and II
HIV I (ages 18+)(3)(5)           HIV I (ages 18+)(3)(5)
Toxoplasmosis (5)                Toxoplasmosis (5)
Vitamin D (OHD)                  Vitamin D (OHD)
Total/normalized calcium         Total/normalized calcium
Selenium (5)                     Selenium (5)
Thyroxine (T4)                   Thyroxine (T4)
Thyroid-stimulating hormone      Thyroid-stimulating hormone
Antithyroglobulin antibodies     Antithyroglobulin antibodies
Antimicrosomal antibodies        Antimicrosomal antibodies
                                 FSH/LH (females aged 35-60   years)
                                 Insulin (6)
                                 C-peptide (6)
Biochemistry profile (5)         Biochemistry profile (5)
 Bicarbonate                      Bicarbonate
 Blood urea nitrogen              Blood urea nitrogen
 Total bilirubin                  Total bilirubin
 Alkaline phosphatase             Alkaline phosphatase
 Cholesterol                      Cholesterol
 AST                              AST
 ALT                              ALT
 LDH                              LDH
 GGT                              GGT
 Total protein                    Total protein
 Albumin                          Albumin
 Creatinine                       Creatinine
 Glucose                          Glucose
 Calcium                          Calcium
 Chloride                         Chloride
 Uric acid                        Uric acid
 Phosphorus                       Phosphorus
 Sodium                           Sodium
 Potassium                        Potassium
 Triglycerides                    Triglycerides
 Globulin                         Globulin
 Iron                             Iron
 Osmolality                       Osmolality


Appendix 1.  Blood and Urine Assessments by Specimen Type and Age Group
                                 (continued)

                       AGE GROUP

 12-19 years                     20 years and older

                       Plasma

                                 Glucose (examinees aged 20-39
                                  years and 75 years and older)
                                 OGTT (examinees aged 40-74
                                  years)
                                 Fibrinogen (examinees aged 40
                                  years and older)(5)

                       Urine

Cadmium                          Cadmium
Creatinine                       Creatinine
Albumin                          Albumin
Iodine                           Iodine
Urine drug (ages 18              Urine drug (examinees aged 18
 years and over)(2)(3)            years and over)(2)(3)
 Cocaine                          Cocaine
 Opiates                          Opiates
 Phencyclidine                    Phencyclidine
 Amphetamines                     Amphetamines
 Marijuana                        Marijuana
                                  Pregnancy test (females aged
                                   20-59 years)

                       White Cells

Storage/banking (5)              Storage/banking (5)

(1)  Includes hematocrit, hemoglobin, red, white and platelet cell counts,
mean cell volume, mean cell hemoglobin, mean cell hemoglobin concentration,
red cell distribution width, platelet distribution width, mean platelet
volume, and 3-cell differential
(2)  Phase 2 only
(3)  Anonymous
(4)  Phase 1 only
(5)  Home examination also
(6)  In phase 2, also from second venipuncture for examinees aged 40-74 years


Appendix 2.  Laboratory Test Detection Limits

Test                                  Detection limit

Albumin (urine)                       0.5 ug/mL
Alpha carotene                        0 ug/dL
Antimicrosomal antibody (AMA)         0.5 U/mL
Antithyroglobulin antibody (ATA)      1.0 U/mL
Beta carotene                         0.67 ug/dL
Beta cryptoxanthin                    0 ug/dL
C-peptide                             0.03 pmol/mL
C-reactive protein                    0.3 mg/dL
Cadmium (urine)                       0.01 ng/mL
Cotinine                              0.05 ng/mL
Creatinine (urine)                    1 mg/dL
Erythrocyte protoporphyrin            2.5 ug/dL RBC
Ferritin                              3 ng/mL
Folate (serum)                        0.2 ng/mL
Follicle stimulating hormone (FSH)    0.15 IU/L
Glucose                               2 mg/dL
Glycated hemoglobin                   0 %
Hematology parameters
 Granulocyte                          0 %
 Granulocyte (1)                      0 number
 Hematocrit                           0 %
 Hemoglobin                           0 g/dL
 Lymphocyte                           0 %
 Lymphocyte (1)                       0 number
 Mean cell hemoglobin                 0 pg
 Mean cell hemoglobin
  concentration                       0 g/dL
 Monocyte                             0 %
 Monocyte    (1)                      0 number
 Platelet count (1)                   0
 Platelet distribution width          0 %
 Red blood cell count (RBC) (1)       0
 Red blood cell distribution width    0 %
 White blood cell count (WBC) (1)     0
Hepatitis profile                     Qualitative tests
Herpes                                Qualitative tests
High density lipoprotein (HDL)        10 mg/dL
Human immunodeficiency virus (HIV)    Qualitative tests
Insulin                               2.5 uU/mL
Iodine (urine)                        0.2 ug/dL
Iron                                  3.0 ug/dL
Lead                                  1 ug/dL
Lipoprotein(a)                        0 mg/dL
Lutein/zeaxanthin                     0.43 ug/dL


Appendix 2.  Laboratory Test Detection Limits (continued)

Test                                  Detection limit

Luteinizing hormone (LH)              0.15 IU/L
Lycopene                              0.63 ug/dL
Normalized calcium                    0.5 mmol/L
RBC folate                            4.4 ng/mL
Retinyl esters                        0 ug/dL
Rheumatoid factor                     Qualitative tests
Rubella                               0 IU
Selenium                              8 ng/mL
Tetanus                               0 U/mL
Thyroid stimulating hormone (TSH)     0.01 mU/mL
Thyroxine (T4)                        1.0 ug/dL
Total iron binding capacity (TIBC)    9 ug/dL
Total cholesterol                     10 mg/dL
Total calcium                         1.5 mmol/L
Toxoplasmosis                         0 IU
Triglycerides                         10 mg/dL
Varicella                             0
Vitamin B12                           20 pg/mL
Vitamin E                             20 ug/dL
Vitamin C                             0 mg/dL
Vitamin A                             0.5 ug/dL
Vitamin D                             5.0 ng/mL

(1)  Units for white blood cell count, red blood cell count, platelet
count, lymphocyte number, granulocyte number, and mononuclear number are
referenced in the Manual for Medical Technicians p. 5-1 (U.S. DHHS, 1996).

Note: Lower detection limits for analytes included in the general
"biochemistry profile" are found in the Laboratory Procedures Used for
NHANES III (U.S. DHHS, 1996).


Appendix 3.  NHANES III SI Table

                    NHANES  NHANES    Conversion   SI     SI
Test (1)             Unit    Format     Factor     Unit  Format

Alanine
 aminotransferase(2) N/A     N/A       N/A        U/L     XXX
Albumin (serum) (2)  g/dL    X.X       10         g/L     XX
Albumin (urine)      ug/mL   XXXXX.XX  N/A        N/A     N/A
Alkaline
 phosphatase (2)     N/A     N/A       N/A        U/L     XXX
Alpha carotene       ug/dL   XXX       0.01863    umol/L  X.XX
Antimicrosomal
 antibody            N/A     N/A       N/A        N/A     N/A
Antithyroglobulin
 antibody            N/A     N/A       N/A        N/A     N/A
Apolipoprotein AI    mg/dL   XXX       0.01       g/L     X.XX
Apolipoprotein B     mg/dL   XXX       0.01       g/L     X.XX
Aspartate amino-
 transferase (2)     N/A     N/A       N/A        U/L     XXX
Beta carotene        ug/dL   XXX       0.01863    umol/L  XX.XX
Beta cryptoxanthin   ug/dL   XXX       0.01809    umol/L  X.XX
Bicarbonate (2)      N/A     N/A       N/A        mmol/L  XX
Bilirubin (total)(2) mg/dL   XX.X      17.1       umol/L  XXX.XX
Blood urea
 nitrogen (2)        mg/dL   XXX       0.357      mmol/L  XX.XX
C-peptide            pmol/mL XX.XXX    1          nmol/L  XX.XXX
C-reactive protein   N/A     N/A       N/A        N/A     N/A
Cadmium (urine)      ng/mL   XX.XX     8.897      nmol/L  XXX.XX
Calcium (total)      N/A     N/A       N/A        mmol/L  X.XX
Calcium (normalized) N/A     N/A       N/A        mmol/L  X.XX
Calcium (2)          mg/dL   XX.X      0.25       mmol/L  X.XXX
Chloride (2)         N/A     N/A       N/A        mmol/L  XXX.X
Cholesterol          mg/dL   XXX       0.02586    mmol/L  XX.XX
Cholesterol (HDL)    mg/dL   XXX       0.02586    mmol/L  X.XX
Cholesterol (LDL)    mg/dL   XXX       0.02586    mmol/L  X.XX
Cholesterol (2)      mg/dL   XXX       0.02586    mmol/L  XX.XXX
Cotinine             ng/mL   XXXX.XXX  N/A        N/A     N/A
Creatinine (2)       mg/dL   XX.X      88.4       umol/L  XXXX.X
Creatinine (urine)   mg/dL   XXX.X     0.0884     mmol/L  XX.X
Diphtheria           N/A     N/A       N/A        N/A     N/A
Ferritin             ng/mL   XXXX      1          ug/L    XXXX
Fibrinogen           mg/dL   XXX       0.01       g/L     X.XX
Folate               ng/mL   XXX.X     2.266      nmol/L  XXX.X
Folate (RBC)         ng/mL   XXXX      2.266      nmol/L  XXXX.X
Follicle-stimulating
 hormone             N/A     N/A       N/A        IU/L    XXX.X
GGT (2)              N/A     N/A       N/A        U/L     XXXX


Appendix 3.  NHANES III SI Table

                    NHANES  NHANES   Conversion   SI      SI
Test (1)             Unit   Format     Factor     Unit   Format

Globulin (2)         g/dL   X.X        10         g/L     XX
Glucose (2)          mg/dL  XXX        0.05551    mmol/L  XX.XX
Glucose (plasma)     mg/dL  XXX.X      0.05551    mmol/L  XX.XXX
Glycated
 hemoglobin          %      XX.X       N/A        N/A     N/A
Helicobacter pylori  N/A    N/A        N/A        N/A     N/A
Hematocrit           %      XX.XX      0.01       L/L=1   0.XXX
Hemoglobin           g/dL   XX.XX      10         g/L     XXX.X
Hepatitis A virus    N/A    N/A        N/A        N/A     N/A
Hepatitis B core
 antibody (anti-HBc) N/A    N/A        N/A        N/A     N/A
Hepatitis B surface
 antigen (HbsAg)     N/A    N/A        N/A        N/A     N/A
Hepatitis C virus    N/A    N/A        N/A        N/A     N/A
Hepatitis D virus    N/A    N/A        N/A        N/A     N/A
Hepatitis B surface
 antibody (anti-HBs) N/A    N/A        N/A        N/A     N/A
Herpes I & II        N/A    N/A        N/A        N/A     N/A
Homocysteine         N/A    N/A        N/A        umol/L  XX.X
Human immuno-
 deficiency virus    N/A    N/A        N/A        N/A     N/A
Insulin              uU/mL  XXX.XX     6.0        pmol/L  XXX.XX
Iodine (urine)       ug/dL  XXX.X      N/A        N/A     N/A
Iron                 ug/dL  XXX        0.1791     umol/L  XX.XX
Iron (2)             ug/dL  XXX        0.1791     umol/L  XX.X
LDH (2)              N/A    N/A        N/A        U/L     XXX
Latex antibody       IU/mL  XXXX.XX    N/A        N/A     N/A
Lead                 ug/dL  XX.X       0.04826    umol/L  X.XXX
Lipoprotein(a)       mg/dL  XXX        0.01       g/L     X.XX
Lutein/zeaxanthin    ug/dL  XXX        0.01758    umol/L  X.XX
Luteinizing hormone  N/A    N/A        N/A        IU/L    XX.X
Lycopene             ug/dL  XXX        0.01863    umol/L  X.XX
Mean cell
 hemoglobin          N/A    N/A        N/A        pg      XX.XX
Mean cell
 volume              N/A    N/A        N/A        fL      XXX.XX
Mean cell
 hemoglobin
 concentration       g/dL   XX.XX      10         g/L     XXX.X
Mean platelet
 volume              N/A    N/A        N/A        fL      XX.XX
Methylmalonic acid   ug/dL  N/A        0.085      umol/L  N/A


Appendix 3.  NHANES III SI Table (continued)

                    NHANES  NHANES  Conversion  SI       SI
Test (1)             Unit    Format   Factor    Unit    Format

Osmolality (2)       N/A    N/A       N/A      mmol/kg  XXX
Phosphorus (2)       mg/dL  XX.X      0.3229   mmol/L   X.XXX
Platelet count (3)   N/A    XXX.X     1        N/A      XXX.X
Potassium (2)        N/A    N/A       N/A      mmol/L   X.XX
Protein (total)(2)   g/dL   XX.X      10       g/L      XXX
Protoporphyrin       ug/dL  XXXX      0.0178   umol/L   XX.XX
Red blood cell
 distribution width  %      XX.XX     0.01     fraction X.XXXX
Red blood cell
 count (3)           N/A    X.XX      1        N/A      X.XX
Retinyl esters       ug/dL  XXX       0.03491  umol/L   X.XX
Rheumatoid factor    N/A    N/A       N/A      N/A      N/A
Rubella              N/A    N/A       N/A      N/A      N/A
Selenium             ng/mL  XXX       0.0127   nmol/L   X.XX
Sodium (2)           N/A    N/A       N/A      mmol/L   XXX.X
Tetanus              U/mL   N/A       N/A      N/A      N/A
Thyroid stimulating
 hormone             uU/mL  XXX.XX    1        mU/L     XXX.XX
Thyroxine            ug/dL  XX.X      12.87    nmol/L   XXX.X
Total iron binding
 capacity            ug/dL  XXX       0.1791   umol/L   XXX.XX
Toxoplasmosis        N/A    N/A       N/A      N/A      N/A
Triglycerides        mg/dL  XXXX      0.01129  mmol/L   XX.XX
Triglycerides (2)    mg/dL  XXXX      0.01129  mmol/L   XX.XXX
Uric acid (2)        mg/dL  XX.X      59.48    umol/L   XXX.X
Varicella            N/A    N/A       N/A      N/A      N/A
Vitamin A            ug/dL  XXX       0.03491  umol/L   X.XX
Vitamin B12          pg/mL  XXXXX     0.7378   pmol/L   XXXXX.XX
Vitamin C            mg/dL  X.XX      56.78    mmol/L   XXX.XX
Vitamin D            ng/mL  XXX.X     2.496    nmol/L   XXX.X
Vitamin E            ug/dL  XXXX      0.02322  umol/L   XXX.XX
White blood cell
 count (3)           N/A    XX.XX     1        N/A      XX.XX

(1)  Results are based on a serum sample unless otherwise noted.
(2)  Biochemistry profile
(3)  Units for white blood cell count, red blood cell count, platelet
count, lymphocyte number, granulocyte number, and mononuclear number are
referenced in the Manual for Medical Technicians p. 5-1 (U.S. DHHS, 1996).


References


 1. Albers JJ, Marcovina SM.  Standardization of apolipoprotein B and A1
    measurements.  Clin Chem 35:1357-61.  1989.

 2. Bachorik PS, Lovejoy K, Carroll MD, Johnson CL, Albers JL, Marcovina SM.
    Measurement of apolipoprotein A1 and B during the Health and Nutrition
    Examination Survey (NHANES III).  Clin Chem 40(110):1915-1920.  1994.

 3. Bull BS, Rittenbach JD.  A proposed reference hematocrit derived from
    multiple MCHC determinations via haemoglobin measurements.  Clin Lab
    Haematol 12 (suppl 1):43-53.  1990.

 4. Lewis SA, Hardison NW, Veillon C.  Comparison of isotope dilution mass
    spectrometry and graphite furnace atomic absorption spectrometry with
    Zeeman background correction for determination of plasma selenium.
    Analytical Chemistry 58:1272-82.  1986.

 5. Marcovina SM, Albers JJ, Dati F, Ledue TB, Richie RF.  International
    Federation of Clinical Chemistry standardization project for measurements
    of apolipoprotein a1 and b.  Clin Chem 37:1676-82.  1991.

 6. National Center for Health Statistics.  Plan and operation of the Third
    National Health and Nutrition Examination Survey, 1988-94.  Vital Health
    Stat 1(32).  Hyattsville, Md.:  NCHS.  1994.

 7. National Committee for Clinical Laboratory Standards.  Procedure for
    determining packed cell volume by the microhematocrit method -- second
    edition:  approved standard.  NCCLS document H7-32.  Wayne, PA:  NCCLS.
    1993.

 8. U.S. Department of Health and Human Services (DHHS).  National Center for
    Health Statistics.  NHANES III reference manuals and reports (CD-ROM).
    Hyattsville, Md.:  Centers for Disease Control and Prevention, 1996.
    Available from National Technical Information Service (NTIS), Springfield,
    Va.  (Acrobat .PDF format; includes access software:  Adobe Systems Inc.
    Acrobat Reader 2.1).

 9. World Health Organization.  Diabetes Mellitus:  Report of a WHO study
    group, WHO Technical Report Series 727.  Geneva, Switzerland:  WHO.  1995.




This page last reviewed: Friday, July 25, 2014
This information is provided as technical reference material. Please contact us at cwus@cdc.gov to request a simple text version of this document.
  Home | Policies and Regulations | Disclaimer | e-Government | FOIA | Contact Us
 Safer, Healthier People
Centers for Disease Control and Prevention, 1600 Clifton Rd, Atlanta, GA 30333, U.S.A.
800-CDC-INFO (800-232-4636) TTY: (888) 232-6348
24 Hours/Every Day - Contact CDC-INFO
 USA.gov HomeDepartment of Health and Human Services Department of Health
and Human Services