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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.
