Skip directly to search Skip directly to A to Z list Skip directly to page options Skip directly to site content
Scientific Data Documentation
Summary File
DSN: CC37.NHIS.Y6981


ABSTRACT

 The National Center for Health Statistics has conducted the Health Interview
 Survey (NHIS) annually beginning in 1957.  It includes a "core" set of
 questions on health-related variables which change little from year-to-year
 and supplements which can vary annually.  More information on the survey in
 general is found in the Current Estimates Series report.  The NHIS is a
 personal interview household survey using a nationwide sample of the
 civilian, noninstitutionalized population of the United States.  The sample
 is chosen in such a way that each person included has a known non-zero
 probability of selection.  These probabilities of selection along with
 adjustments for nonresponse and poststratification are reflected in the
 sample weights which are provided on the Public Use Tape.

USE OF SAMPLE WEIGHTS

 Since NHIS uses a multistage sample designed to represent the civilian
 noninstitutionalized population of the United States, it is necessary to
 utilize the person's basic weight for proper analysis of the data.  In
 addition to the design and ratio adjustments included in the person basic
 weight the person weight is further modified depending on the variable
 selected (e.g., 2-week bed days), the length of the recall period, and the
 period of time for which the estimate is to be made.

 For annual prevalence estimates of chronic conditions reported in response
 to a condition list, the condition list weight should be used instead of the
 person weight.  This weight also adjusts for the subsample of persons that
 were assigned a given condition list.

SAMPLE DESIGN, VARIANCE, ESTIMATION, AND HYPOTHESIS TESTING

 The data collected in the National Health Interview Survey (NHIS) are
 obtained through a complex sample design involving both clustering and
 stratification.  Because of the complex design and the ratio adjustments
 applied to the sample weights (see previous section on use of sample
 weights), the direct application of standard statistical analysis methods
 for variance estimation and hypothesis testing may yield misleading results.

 There are computer programs available which provide the capability of
 variance estimation for complex sample designs.  The balanced repeated
 replication approach1 is utilized in &REPERR-&PSALMS-OSIRIS.IV2 to calculate
 the variance-covariance matrix.  SESUDAAN3 and SURREGR,4 are programs that
 calculate the variance-covariance matrix using the linearization approach5
 (Taylor series expansion).

 In order to provide the user with the capability of estimating the complex
 sample variance in the NHIS data using the above procedures, we have
 provided Pseudo-Strata and Pseudo Primary Sampling Unit (PSU) codes on the
 data tapes.  These variables and the sample weights are necessary for the
 calculation of variances.

 Even though the overall number of persons in this survey is quite large for
 statistical inference purposes, subclass analyses can lead to estimators
 that are unreliable.  Consequently, analyses of subclasses require that the
 user pay particular attention to the coefficient of variation for the
 estimates of means, proportions and totals.  In addition, small sample
 sizes, or a small number of PSU's used in the variance calculations may
 produce unstable estimates of the variances using the above computer
 programs.

 A NCHS Series 2 publication discussing these issues is in publication.
 Detailed information from this publication on calculating variances and the
 use of sample weights is available, upon request, from NCHS.

SELECTION CRITERIA

 (a)  Age greater than or equal to 30 (at the time of interview).

 (b)  Variables of specific substantive interest (e.g., ethnicity).

 (c)  Information on a given variable being available for at least 8 years.

 (d)  Variable selected only once, though parallel entries exist on the input
      files that were merged.

 (e)  Variables that related only to data processing and collection such as
      interview number, etc., were excluded.

 (f)  Conditions that were defined as chronic by NCHS and caused limitation
      of activity either as the primary cause or as a secondary cause.

RECORD LAYOUT

 Personal Information
 Record Positions 1-50

                           RECORD
 NAME OF VARIABLE         POSITION  RANGE     DECODE

 Type of PSU              1         0-6       0 = The 31 Large Self-
                                                  representing SMSA's
                                              1 = SMSA - Self representing
                                              3 = SMSA - Nonself-representing
                                              4 = Non-SMSA - Self-representing
                                              6 = Non-SMSA - Nonself-
                                                  representing
                                              NOTE:  Before 1973 definition
                                                     included only 22
                                                     SMSA's.  (Refer to note
                                                     on SMSA's - Appendix A)

 Region                   2         1-4       1 = Northeast
                                              2 = North Central
                                              3 = South
                                              4 = West

 Geographic               3         1-3       1 = In SMSA; in Central City
   Identification                             2 = In SMSA; not in Central City
                                              3 = Not in SMSA

                                              NOTE:  Refer to note on SMSA
                                                     definition - Appendix A

 Type of Living           4         1-2       1 = Housing Unit
   Quarters                                   2 = Other

 Telephone                5         0-3       0 = Not reported, noninterviews,
                                                  refusal
                                              1 = Yes - phone
                                              2 = No or none
                                              3 = Phone, but no number listed
                                                  or number refused

 Race                     6         1-3       1 = White
                                              2 = Negro
                                              3 = Other

                                              NOTE:  Reported race is the
                                                     race variable used in
                                                     all NHIS reports
                                                     beginning with the 1980
                                                     data year (as opposed to
                                                     race as observed, by the
                                                     interviewer for previous
                                                     years).

 Sex                      7         1-2       1 = Male
                                              2 = Female

 Age                      8-9       30-99     30-98 = Single years
                                              99 = 99+ years

 Marital Status           10        1-5       1 = Married
                                              2 = Widowed
                                              3 = Never married
                                              4 = Divorced
                                              5 = Separated

 Education of Indi-       11-12     02-12     02 = None
   vidual-Completed                           03 = 1-4 years completed
   Years                                      04 = 5-7 years completed
                                              05 = 8 years completed
                                              06 = 9-11 years completed
                                              07 = 12 years completed (high
                                                   school grad.)
                                              08 = 13-14 years completed
                                              09 = 15 years completed
                                              10 = 16 years completed (college
                                                   graduate)
                                              11 = 17+ years completed
                                                   (graduate school)
                                              12 = Unknown

 Education of Family      13-14     01-12     01 = Head is under 17 years of
   Head or Unrelated                               age
   Individual-Detail                          02 = None
                                              03 = 1-4 years completed
                                              04 = 5-7 years completed
                                              05 = 8 years completed
                                              06 = 9-11 years completed
                                              07 = 12 years completed (high
                                                   school grad.)
                                              08 = 13-14 years completed
                                              09 = 15 years completed
                                              10 = 16 years completed (college
                                                   graduate)
                                              11 = 17+ years completed
                                                   (graduate school)
                                              12 = Unknown

 Veteran Status           15        1-9,      Blank = Missing information
                                    Blank     1 = Nonveteran
                                              2 = Peacetime only
                                              3 = World War I
                                              4 = World War II
                                              5 = Korean War
                                              6 = Vietnam Veteran
                                              7 = DK if served in Armed Forces
                                              8 = DK if war veteran
                                              9 = Post Vietnam

                                              NOTE:  a) information not avail-
                                                        able for 1969
                                                     b) Code 9 included after
                                                        1976

 Family Income or         16-17     01-12     01 = Under $1,000
   Income of Unrelated                        02 = $ 1,000-1,999
   Individual                                 03 =   2,000-2,999
                                              04 =   3,000-3,999
                                              05 =   4,000-4,999
                                              06 =   5,000-5,999
                                              07 =   6,000-6,999
                                              08 =   7,000-9,999
                                              09 =  10,000-14,999
                                              10 =  15,000-24,999
                                              11 =  25,000+
                                              12 = Unknown or not reported

                                              NOTE:  Information for 1969
                                                     Code 10 = $15,000+
                                                     Code 11 = Not used

 Family Relationship

   Type of Family         18-19     0-9,      0 = Primary family
                                    11-12     1-9 = Secondary families
                                              11 = Primary individual
                                              12 = Secondary individual

   Relationship           20        0-7       0 = Head of family or unrelated
                                                  individual not living alone
                                              1 = Wife (husband living at home
                                                  and not in Armed Forces)
                                              2 = Wife (husband living at home
                                                  and is in Armed Forces)

   Relationship                               3 = Child of head of spouse
   (Continued)                                4 = Grandchild of head or spouse
                                              5 = Parent of head or spouse
                                              6 = Other relative
                                              7 = Unrelated individual living
                                                  alone

 Usual Activity           21        1-6       1 = Usually working
                                              2 = Keeping house (female)
                                              3 = Retired (45+ years)
                                              4 = Going to school
                                              5 = Something else
                                              Unknown

 Current Activity         22        1-8       1 = Worked in past 2 weeks
   During Past 2 Weeks                        2 = Did not work, has job, not
                                                  on layoff and not looking
                                                  for work
                                              3 = Did not work, has job,
                                                  looking for work
                                              4 = Did not work, has job, on
                                                  layoff
                                              5 = Did not work, has job, on
                                                  layoff and looking for work
                                              6 = Did not work, has job,
                                                  unknown if looking or on
                                                  layoff
                                              7 = Did not work, no job,
                                                  looking for work or on
                                                  layoff
                                              8 = Not in labor force

                                              NOTE:  Codes 1-3 = Currently
                                                     employed
                                                     Codes 5-7 = Currently
                                                     unemployed

 Class of Worker          23        1-8       1 = Private paid
                                              2 = Federal Government
                                              3 = Other Government
                                              4 = Self-employed
                                              5 = Nonpay
                                              6 = Other (new worker)
                                              7 = Unknown or not reported
                                              8 = Not in Labor Force

 Industry Detail Code     24-26     001-999,  Standard International Classifi-
                                    Blank     cation
                                              For Code Outline Refer to
                                              Appendix B
                                              Blank = Not applicable

 Occupation               27-29     000-999,  Standard Classification
   Detail Code                      Blank     For Code Outline Refer to
                                              Appendix C
                                              Blank = Not applicable

 Respondent               30        1-9       1 = Self entirely
                                              2 = Self partly
                                              3 = Spouse
                                              4 = Mother
                                              5 = Father
                                              6 = Other female family member
                                              7 = Other male family member
                                              8 = Other
                                              9 = Not reported

 Age of Respondent        31        1-6       1 = Under 20 years
                                              2 = 20-54 years
                                              3 = 55-64 years
                                              4 = 65-74 years
                                              5 = 75+ years
                                              6 = Unknown and not reported

 Actual Family Size       32-33     00-27     00 = Unrelated individuals
                                                   living together
                                              01+ = Family size

 Limitation of Activity   34        1-4       1 = Cannot perform usual
   Due to Chronic                                 activity
   Conditions                                 2 = Can perform usual activity
                                                  but limited in amount and
                                                  kind
                                              3 = Can perform usual activity
                                                  but limited in outside
                                                  activities
                                              4 = Not limited (including
                                                  unknown) or not applicable
                                                  (persons with no chronic
                                                  conditions)

 Duration of Limitation
   Activity

   Unit                   35        1-3,      1 = Months
                                    Blank     2 = Years
                                              3 = Unknown
                                              Blank = Not applicable

   Number of Units        36-37000000-99,    00 = Less than 1 month if coded
                                    Blank          1 in unit field
                                              01-97 = Number of months or
                                                   years
                                              99 = Unknown
                                              Blank = Not applicable

 Restricted Activity      38-39     00-14     00 = None
   Days in Past 2 Weeks                       01-14 = Number of days

 Bed Disability Days in   40-41     00-14     00 = None
   Past 2 Weeks                               01-14 = Number of days

 Work Days Lost in        42-43     00-14,    00 = None
   Past 2 Weeks                     Blank     01-14 = Number of days
                                              Blank = Missing information

 Number of Days in        44-45     00-14,    00 = None
   Hospital in Past 2               Blank     01-14 = Number of days
   Weeks (excl. nursing                       Blank = Missing information
   home and hospitals
   not in index service                       NOTE:  Information not available
   codes 93, 94, 95)                                 for 1979-1981

 Dental Visits in         46-47     00-98,    00 = None
   2 Weeks                          Blank     01-98 = Number of visits
                                              Blank = Missing information

                                              NOTE:  Information not available
                                                     for 1980, 1981

 Dental Visits in 12
   Months

   Known/Unknown Code     48        1-2,      1 = Number of visits known
                                    Blank     2 = Number of visits unknown
                                              Blank = Missing information

   Number of Visits       49-50     00-98,    00 = None or unknown number
                                    Blank     01-98 = Number of visits
                                              Blank = Missing information

                                              NOTE:  Information available
                                                     only for 1969-1975

 Record Positions 51-93

                           RECORD
 NAME OF VARIABLE         POSITION  RANGE     DECODE


 Interval Since Last      51        0-8       0 = Never
   Dental Visit                               1 = Visits in 2 weeks
                                              2 = 2 weeks - less than 6 months
                                              3 = 6 months - 12 months
                                              4 = 1 year
                                              5 = 2-4 years
                                              6 = 5-9 years
                                              7 = 10+ years
                                              8 = Unknown

 Total 2-Week Doctor      52-53     00-16,    00 = None
   Visits                           Blank     01+ = Number of visits
                                              Blank = Missing information

                                              NOTE:  Information available
                                                     only for 1979-1981

 Doctor Visits in 12
   Months

   Known/Unknown Code     54        1-2       1 = Number of visits known
                                              2 = Number of visits unknown

   Number of Visits       55-57     000-998   000 = None or unknown
                                              001-998 = Number of visits

 Interval Since Last      58        0-9       0 = Never
   Doctor Visit                               1 = Visit in past 2 weeks
                                              2 = Visit as inpatient in 2
                                                  weeks
                                              3 = 2 weeks to less than 6
                                                  months
                                              4 = 6 months to less than 12
                                                  months
                                              5 = 1 year
                                              6 = 2-4 years
                                              7 = 5-9 years
                                              8 = 10+ years
                                              9 = Unknown

 Number of Short-Stay     59-61     000-365   000 = None
   Hospital Days in                           001-365 = Number of days
   Past 12 Months

 Number of Short-Stay     62-63     00-30     00-30 = Number of Episodes
   Hospital Episodes

 Hospital Ownership for   64        0-3,      0 = No episodes
   SS Episodes                      Blank     1 = All in federal hospitals
                                              2 = All in nonfederal hospitals
                                              3 = Both federal and nonfederal
                                                  hospitals
                                              Blank = Missing information

                                              NOTE:  Information not available
                                                     for 1969

 Health Status            65        1-5,      1 = Excellent
                                    Blank     2 = Good
                                              3 = Fair
                                              4 = Poor
                                              5 = Unknown
                                              Blank = Missing information

                                              NOTE:  Information not available
                                                     for 1969-71

 Income of Head of        66-67     01-13,    01 = Under $1,000
   Family                           Blank     02 = $ 1,000-1,999
                                              03 =   2,000-2,999
                                              04 =   3,000-3,999
                                              05 =   4,000-4,999
                                              06 =   5,000-5,999
                                              07 =   6,000-6,999
                                              08 =   7,000-9,999
                                              09 =  10,000-14,999
                                              10 =  15,000-24,999
                                              11 =  25,000 and over
                                              12 = Unknown
                                              13 = No income received
                                              Blank = Missing information

                                              NOTE:  Information not available
                                                     for 1969-73

 Ethnicity                68-69     00-18,    Blank = Missing information
                                    Blank
                                              NOTE:  This variable has no
                                                     consistency across time,
                                                     refer to Appendix D for
                                                     the definition used in
                                                     any given year.
                                                     Information available
                                                     from 1976-1981.

 Bed Days Past 12         70        0-5,      0 = None
   Months                           Blank     1 = 1-7 days
                                              2 = 8-30 days
                                              3 = 31-180 days
                                              4 = 181-365 days
                                              5 = Unknown
                                              Blank = Missing information

                                              NOTE:  Information available
                                                     from 1978-81

 Final Quarterly Weight   71-75     250.-     XXXXX.
   for Personal                     90570.
   Information                                NOTE:  This weight is to be
                                                     used for national
                                                     quarterly estimates

 Special Place            76-77     00-99,    Refer to Appendix E for Codes
                                    Blank

 Number of Unrelated      78-79     00-99
   Individuals in the
   Household

 Number of Persons in     80-81     00-99     NOTE:  Persons below age 30
   the Household                                     years are not included
                                                     in this file but are
                                                     counted in this field.

 Size of Family -         82-83     00-99
   Primary Family

 Size of Family -         84-85     00-99
   Secondary Family
   No. 1

 Size of Family -         86-87     00-99
   Secondary Family
   No. 2

 Size of Family -         88-89     00-99
   Secondary Family
   No. 3

 Head Present - Primary   90        1, 2,     1 = Yes
   Family                           Blank     2 = No head present
                                              Blank = No primary family

 Head Present -           91        1, 2,     1 = Yes
   Secondary Family                 Blank     2 = No head present
   No. 1                                      Blank = No primary family

 Head Present -           92        1, 2,     1 = Yes
   Secondary Family                 Blank     2 = No head present
   No. 2                                      Blank = No primary family

 Head Present -           93        1, 2,     1 = Yes
   Secondary Family                 Blank     2 = No head present
   No. 3                                      Blank = No primary family


 Household Information

                           RECORD
 NAME OF VARIABLE         POSITION  RANGE     DECODE

 Date of Completion of
   Interview

   Month                  94-95     01-12,    01 = January
                                    Blank     02 = February
                                              03 = March
                                              04 = April
                                              05 = May
                                              06 = June
                                              07 = July
                                              08 = August
                                              09 = September
                                              10 = October
                                              11 = November
                                              12 = December
                                              Blank = Not reported

   Day                    96-97     01-32,    01-31 = Days of Month
                                    Blank     Blank = Not reported

 Total Rooms              98        1-9,      1 = 1 Room
                                    0, Blank  2 = 2 Rooms
                                              3 = 3 Rooms
                                              4 = 4 Rooms
                                              5 = 5 Rooms
                                              6 = 6 Rooms
                                              7 = 7 Rooms
                                              8 = 8 Rooms
                                              9 = 9+ Rooms
                                              0 = DK or not reported
                                              Blank = Not a housing unit

 Final Basic Quarterly    99-104    00190.2-  Adjusted by Segment/Special
   Weight for Household             66866.2   HH Sampling Factors (XXXXX.X)
   Information
                                              NOTE:  See NHIS, Series 1, Nos.
                                                     11 and 18 for
                                                     information concerning
                                                     the use of this field.

 Medical conditions Information

                         RECORD
 NAME OF VARIABLE       POSITION  RANGE       DECODE

 Number of Conditions   105-106   0-23        Total number of conditions
                                              reported for the person
                                              including acute conditions and
                                              conditions not causing
                                              limitation of activity

 (Up to 5 conditions are recorded on the following variables in condition
 fields.)

 Condition List         107       1-8         1 = Condition List 1 - Digestive
   Assigned and Asked                         2 = Condition List 2 - Bone &
                                                  Muscle
                                              3 = Condition List 3 - Miscel-
                                                  laneous
                                              4 = Condition List 4 - Impair-
                                                  ments
                                              5 = Condition List 5 - Circula-
                                                  tory
                                              6 = Condition List 6 - Respira-
                                                  tory
                                              7 = Unknown
                                              8 = Not assigned and asked

                                              NOTE:  Years in which codes are
                                                     used
                                                     1  1975, 1978-81
                                                     2  1969, 1976, 1978-81
                                                     3  1973, 1978-81
                                                     4  1971, 1977, 1978-81
                                                     5  1972, 1978-81
                                                     6  1970, 1978-81
                                                     7  1978-81
                                                     8  1974

                                                     Refer to Appendix F

 Final Annual           108-115   000000.00-  XXXXXX.XX
   Condition List                 098591.76
   Weight
                                              NOTE:  This weight is to be
                                                     used for national
                                                     estimates by year for
                                                     the six separate
                                                     subsamples generated
                                                     using the condition list
                                                     assigned and asked
                                                     categories 1 through 6.
                                                     See NHIS, Series 1, Nos.
                                                     11 and 18 for further
                                                     information.  Also refer
                                                     to Appendix F.

 Number of Conditions   116       0-5         Of the first 5 conditions
   Recorded                                   reported by the individual,
                                              those that were classified as
                                              "chronic" and caused limitation
                                              of activity either as a primary
                                              or secondary cause were
                                              recorded.  Refer to Appendix G
                                              for definitions.

 Onset                            1-5,        1 = Last week
   1)                   117       Blank       2 = Week before
   2)                   144                   3 = 2 weeks to 3 months
   3)                   171                   4 = 3-12 months
   4)                   198                   5 = 12+ months
   5)                   225                   Blank = Not applicable

 HCondition Diagnostic                         ICD Rubric.  Refer to Appendix
         Code                                  Blank = Not applicable
   1)                   118-121
   2)                   145-148
   3)                   172-175
   4)                   199-202
   5)                   226-229

 Restricted Activity              00-14,      00 = None
   in Past 2 Weeks                Blank       1-14 = Number of days
   1)                   122-123               Blank = Not applicable
   2)                   149-150
   3)                   176-177
   4)                   203-204
   5)                   230-231

 Bed Days in Past                 00-14,      00 = None
   2 Weeks                        Blank       1-14 = Number of days
   1)                   124-125               Blank = Not applicable
   2)                   151-152
   3)                   178-179
   4)                   205-206
   5)                   232-233

 Work Days Lost in                00-14,      00-14 = Number of days
   Last 2 Weeks                   Blank       Blank = Not applicable
   1)                   126-127
   2)                   153-154
   3)                   180-181
   4)                   207-208
   5)                   234-235

 Cause of Limitation              1-2,        1 = Main cause
   Activity                       Blank       2 = Secondary cause
   1)                   128                   Blank = Not applicable
   2)                   155
   3)                   182
   4)                   209
   5)                   236

 Doctor Seen                      1-2,        1 = Yes
   1)                   129       Blank       2 = No
   2)                   156                   Blank = Not applicable
   3)                   183
   4)                   210
   5)                   237

 Responses to Probe Questions

 NOTES:  Not used in 1974.  Refer to Appendices F and I.

                         RECORD
 NAME OF VARIABLE       POSITION  RANGE       DECODE

 Condition Past AA                1-3,        1 = Doctor seen
   1)                   130       Blank       2 = Doctor not seen
   2)                   157                   3 = Condition not past AA
   3)                   184                   Blank = Not applicable
   4)                   211
   5)                   238

 Take Medication or               1-4,        1 = Yes
   Treatment Now                  Blank       2 = No
   1)                   131                   3 = DK or not reported
   2)                   158                   4 = Doctor not seen
   3)                   185                   Blank = Not applicable
   4)                   212
   5)                   239

 Medicine or                      1-4,        1 = Yes
   Treatment                      Blank       2 = No
   1)                   132                   3 = DK or not reported
   2)                   159                   4 = Doctor not seen
   3)                   186                   Blank = Not applicable
   4)                   213
   5)                   240

 Surgical Treatment               1-4,        1 = Yes
   1)                   133       Blank       2 = No
   2)                   160                   3 = DK or not reported
   3)                   187                   4 = Not applicable (Doctor not
   4)                   214                       seen)
   5)                   241                   Blank = Not applicable

 Hospitalization                  1-4,        1 = Yes
   1)                   134       Blank       2 = no
   2)                   161                   3 = DK or not reported
   3)                   188                   4 = Not applicable (Doctor not
   4)                   215                       seen)
   5)                   242                   Blank = Not applicable

 Doctor Visits in
   Past 12 Months

   Information Status             1-3,        1 = None and known number of
   1)                   135       Blank           visits
   2)                   162                   2 = Unknown/not reported
   3)                   189                   3 = Doctor not seen
   4)                   216                   Blank = Not applicable
   5)                   243

   Number of Visits               000-998     000-998 = Number of visits if 1
   1)                   136-138                         on previous variable
   2)                   163-165               000 = Unknown/not reported/not
   3)                   190-192                     applicable if 2 or 3 on
   4)                   217-219                     previous variable
   5)                   244-246               Blank = Not applicable

 Bed Days in Past 12
   Months

   Information Status             1-2,        1 = Known
   1)                   139       Blank       2 = Unknown/not reported
   2)                   166                   Blank = Not applicable
   3)                   193
   4)                   220
   5)                   247

   Number of Days                 000-365,    000-365 = Number of days
   1)                   140-142   Blank       Blank = Not applicable
   2)                   167-169
   3)                   194-196
   4)                   221-223
   5)                   248-250

 Injury Information

                         RECORD
 NAME OF VARIABLE       POSITION  RANGE       DECODE

 Injury - Place of                1-9,        1 = At home - inside
   Accident                                   2 = At home - outside
   1)                   143                   3 = Street and highway
   2)                   170                   4 = Farm
   3)                   197                   5 = Industrial place
   4)                   224                   6 = School
   5)                   251                   7 = Place of recreation
                                              8 = Other
                                              9 = DK, not reported/not
                                                  applicable

 Processing Information

                         RECORD
 NAME OF VARIABLE       POSITION  RANGE       DECODE

 Year                   252-253   69-81       Year of processing

 Pseudo-Stratum         254-256   0-149       Computed as Integer (PPSU/2+0.5)

 Pseudo-PSU (PPSU)      257-259   0-298       NOTE:  Pseudo-Strata and
                                                     Pseudo-PSU's are to be
                                                     used for calculating
                                                     standard errors

 Processing Quarter     260       1-4         1 = Quarter 1
   Code                                       2 = Quarter 2
                                              3 = Quarter 3
                                              4 = Quarter 4

 Random Recode of PSU   261-263   0-999       For person and household
                                              identification

 Week - Census Code     264-265   0-93        For person and household
                                              identification

 Segment Number         266-267   0-99        NOTE:  Week plus segment number
                                                     identifies the segment

 Household Number       268-269   99099       NOTE:  Year x Quarter x PSU x
                                                     Week x Segment x
                                                     Household Number
                                                     identifies household

 Person Number          270-271   00-99       Person number within household
                                              identifies person

 Demographic Center Recodes

                         RECORD
 NAME OF VARIABLE       POSITION  RANGE       DECODE

 Computed Year of       272-273   00-99       Year of birth relative to
   Birth                                      reference year 1860.  Computed
                                              by the formula:

                                                  YOB = YEAR - AGE + 40

 Cohort Number          274-275   1-17        17 = Born 1950-1954
                                              16 = Born 1945-1949
                                              15 = Born 1940-1944
                                              14 = Born 1935-1939
                                              13 = Born 1930-1934
                                              12 = Born 1925-1929
                                              11 = Born 1920-1924
                                              10 = Born 1915-1919
                                               9 = Born 1910-1914
                                               8 = Born 1905-1909
                                               7 = Born 1900-1904
                                               6 = Born 1895-1899
                                               5 = Born 1890-1894
                                               4 = Born 1885-1889
                                               4 = Born 1880-1884
                                               2 = Born 1875-1879
                                               1 = Born before 1875

  Large Self-Representing SMSA's

 34 = Boston
 35 = New York*
 36 = Philadelphia
 37 = Pittsburgh
 38 = Detroit
 39 = Chicago**
 40 = Cincinnati
 41 = Los Angeles-Long Beach
 42 = San Francico-Oakland
 43 = Baltimore
 44 = Atlanta
 45 = Buffalo
 46 = Cleveland
 47 = Minneapolis-St. Paul
 48 = Milwaukee
 49 = Kansas City
 50 = St. Louis
 51 = Houston
 52 = Dallas
 53 = Washington, D.C.
 54 = Seattle-Everett
 55 = San Diego
 56 = Anaheim-Santa Ana-Garden Grove
 57 = Miami
 58 = Denver
 59 = San Bernardino-Riverside-Ontario
 60 = Indianapolis
 61 = San Jose
 62 = New Orleans
 63 = Tampa-St. Petersburg
 64 = Portland, Oregon

 Blank ... Nonself-representing sections and self-representing SMSA's other
 than 34-64.

  * Northeastern New Jersey Consolidated Area
 ** Northwestern Indiana Consolidated Area

 NOTE:  Codes 56-64 included in the definition of large self-representing
 SMSA's after 1972.



APPENDIX B - INDUSTRY RECODES OUTLINE

 Industry Recodes Outline

 Recodes 1-29

     Recodes         Detail
  No. 1    No. 2      Code               INDUSTRY TITLE            SIC Code*

    1        01     017-019   AGRICULTURE                          01, 07,
                                                                    ex 0713

    2        02     027-028   FORESTRY AND FISHERIES               08, 09

   10        03     047-049   MINING                               10-14
                      057

   20        04     067-069   CONSTRUCTION                         15-17
                      077

 Recodes 30-43 Manufacturing

     Recodes         Detail
  No. 1    No. 2      Code               INDUSTRY TITLE            SIC Code*

 (30-43)     (05)              MANUFACTURING:

   30        05     268-298   Food and Kindred Products            20,0713

   31        05     307-318   Textile Mill Products                   22

   32        05     319,327   Apparel and other finished              23
                              products made from fabrics and
                              similar materials

   33        05     107-109   Lumber and wood products,               24
                              except furnitures

   34        05       118     Furniture and fixtures                  25

   35        05     338,339   Printing, publishing, and               27
                              allied industries

   36        05     347-369   Chemicals and allied products           28

   37        05     119-138   Stone, clay, and glass products         32

   38        05     139-149   Primary metal industries                33

   39        05     157-169   Fabricated metal products,              34
                              except ordnance, machinery
                              and transportation equipment

   40        05     177-198   Machinery, except electrical            35

   41        05     199-209   Electrical machinery, equipment,        36
                              and supplies

   42        05     219-238   Transportation Equipment                37

   43        05     239-259   All other and unspecified            21,26,
                    299                                            29-31,
                    328-337                                        38,39,
                    377-398                                        19

 Recodes 50-51 Transportation

     Recodes         Detail
  No. 1    No. 2      Code               INDUSTRY TITLE            SIC Code*

 (50-60)     (06)              TRANSPORTATION

   50        06       407     Railroad transportation                 40

   51        06     408-429   All other transportation             41,42
                                                                   44-47

 Recode 52 Communication

     Recodes         Detail
  No. 1    No. 2      Code               INDUSTRY TITLE            SIC Code*

   52        06     447-449   COMMUNICATION                           48

 Recode 53 Electric,Gas, and Sanitary Services

     Recodes         Detail
  No. 1    No. 2      Code               INDUSTRY TITLE            SIC Code*

   53        06     467-479   ELECTRIC, GAS, AND SANITARY             49
                              SERVICES

 Recode 60 Wholesale Trade

     Recodes         Detail
  No. 1    No. 2      Code               INDUSTRY TITLE            SIC Code*

   60        07     507-588   WHOLESALE TRADE                         50

 Recodes 61-62 Retail Trade

     Recodes         Detail
  No. 1    No. 2      Code               INDUSTRY TITLE            SIC Code*

 (61-62)     (07)              RETAIL TRADE:

   61        07       669     Eating and drinking places              58

   62        07     607-668   Other retail trade                   52-57,
                    677-698                                           59

 Recode 70 Finance, Insurance, and Real Estate

     Recodes         Detail
  No. 1    No. 2      Code               INDUSTRY TITLE            SIC Code*

   70        08     707-718   FINANCE, INSURANCE, AND REAL         60-67
                              ESTATE

 Recodes 80-87 Services

     Recodes         Detail
  No. 1    No. 2      Code               INDUSTRY TITLE            SIC Code*

 (80-87)     (09)              SERVICES:

   80        09     779-798   Personal services (except private       72
                              households

   81        09     727-748   Miscellaneous business services         73

   82        09     749-759   Repair services                      75,76

   83        09     807-809   Amusement and recreation services    78,79

   84        09     828-848   Medical and other health services       80

   85        09     857-869   Educational services                 82,84

   86        09       769     Private households                      88

   87        09     777,778,  Other miscellaneous services         70,81
                    849,877-                                       86,89
                      897

 Recodes 90-92 Government

     Recodes         Detail
  No. 1    No. 2      Code               INDUSTRY TITLE            SIC Code*

 (90-92)     (10)              GOVERNMENT

   90        10     907,917   Federal government, including        91,94
                              international

   91        10       927     State government                        92

   92        10       937     Local government                        93

 Recode 93-95 Unknown Industry

     Recodes         Detail
  No. 1    No. 2      Code               INDUSTRY TITLE            SIC Code*

   93        11     997,999   UNKNOWN INDUSTRY                        -
                    and all
                    other
                    codes

   94        11       996     New Worker                              99

   95        12     Not       Codes 0 and 8 in current activity
                    Appli-    recode (Loc. 75) (Under 17 or 17+
                    cable     and not in Labor Force)

 *Standard International Classification


 Industry Recode No. 2 - Titles
                                                                Recode No. 1
     Code                        TITLES                          Inclusions


      01           Agriculture                                       01

      02           Forestry and Fisheries                            02

      03           Mining                                            10

      04           Construction                                      20

      05           Manufacturing                                    30-43

      06           Transportation and Public Utilities              50-53

      07           Wholesale and Retail Trade                       60-62

      08           Finance, Insurance and Real Estate                70

      09           Services and Miscellaneous                       80-87

      10           Public Administration                            90-92

      11           Unknown                                          93,94

      12           Not in Labor Force                                95



APPENDIX C - OCCUPATION RECODE OUTLINE

 Occupation Recode Outline

 Recodes 1-10 Professional, Technical, Sales, and Kindred Workers

     Recodes             Detail
  No. 1      No. 2        Code                     INDUSTRY TITLE

 (01-06)                                PROFESSIONAL, TECHNICAL, AND KINDRED
                                       WORKERS

   01          01        002,006-      Engineers and architects
                         023

   02          01        034-054,      Scientists
                         091-096

   03          01        061-085       Health workers

   04          01        102-145       Teachers, including college

   05          01        150-162       Engineering and science technicians

   06          01        All other     All other professional, technical, and
                         codes         kindred workers
                         0--,1--

   07          02        201-245       Managers and administrators, except
                                       farm

   10          03        260-285       Sales workers

 Recodes 11-15 Clerical and Kindred Workers

     Recodes         Detail
  No. 1    No. 2      Code               INDUSTRY TITLE            SIC Code*

 (11-15)                                CLERICAL AND KINDRED WORKERS

   11          04          305         Bookkeepers

   12          04        341-355       Office machine operators

   13          04        331,332,      Mail handlers, postal clerks, and
                         361,383       telegraph messengers

   14          04        364-372       Secretaries, stenographers, typists,
                         376,391       and receptionists

   15          04        All other     All other clerical workers
                         codes 3--

 Recodes 20-24 Craftsmen and Kindred Worders

     Recodes         Detail
  No. 1    No. 2      Code               INDUSTRY TITLE            SIC Code*

 (20-24)                                CRAFTSMEN AND KINDRED WORKERS

   20          05        415,416       Carpenters

   21          05        410-412,421,  Other construction craftsmen
                         430,431,436,
                         440,510-512,
                         520-523,
                         534,550,
                         560

   22          05        470-495       Mechanics and repairmen

   23          05        403,404,      Metal craftsmen, except
                         442,446,        mechanics
                         454,461
                         462,502-504,
                         514,533
                         535-540,
                         561,562

   24          05        All other     All other craftsmen
                         codes 4--,
                         5--

 Recodes 30-51 Operatives, Transport, Laborers, Farmers, Foremen

     Recodes         Detail
  No. 1    No. 2      Code               INDUSTRY TITLE            SIC Code*

   30          06        601-696       Operatives, except transport

   31          07        701-715       Transport equipment operatives

   40          08        740-785       Laborers, except farm

   50          09        801,802       Farmers and farm managers

   51          10        821-824       Farm laborers and farm foremen

 Recodes 60-63 Service Workers Except Private Household

     Recodes         Detail
  No. 1    No. 2      Code               INDUSTRY TITLE            SIC Code*

 (60-63)                               SERVICE WORKERS, EXCEPT PRIVATE
                                       HOUSEHOLD

   60          11        901-903       Cleaning service

   61          11        910-916       Food service

   62          11        921-954       Health and personal service

   63          11        960-965       Protective service

 Recodes 64-90 Private Household, Unknown, and New Workers

     Recodes         Detail
  No. 1    No. 2      Code               INDUSTRY TITLE            SIC Code*

   64          12        980-984       Private household workers

   70          13          995         Occupation not reported, or unknown

   80          13          990         New workers

   90          14        Not           Codes 0 and 8 in current activity
                         Applicable    recode (Loc. 75).


 Occupation Recode No. 2 - Titles

                                                                Recode No. 1
     Code                        TITLES                          Inclusions


      01         Professional, technical, and kindred workers       01-06

      02         Managers and administrators, except farm            07

      03         Sales workers                                       10

      04         Clerical and kindred workers                       11-15

      05         Craftsmen and kindred workers                      20-24

      06         Operatives, except transport                        30

      07         Transport equipment operatives                      31

      08         Laborers, except farm                               40

      09         Farmers and farm managers                           50

      10         Farm laborers and farm foremen                      51

      11         Service workers, except private household          60-63

      12         Private household workers                           64

      13         Unknown                                            70,80

      14         Not in Labor Force                                  90



APPENDIX D - RACE DEFINITIONS

 1976 Definition

    00 = American
    02 = Central or South American
    03 = Chicano
    04 = Mexican
    05 = Mexicano
    06 = Mexican-American
    07 = Puerto Rican
    08 = Other Spanish
    09 = Other European
    10 = Black
    11 = American Indian
    12 = Asian or Pacific Islander
    13 = Another group not listed
    14 = Multiple
    15 = Russian
    16 = Canadian
    17 = Two origins, Unknown which is main
    18 = Unknown, Refused or Not reported

 1977 Definition

    00 = American
    02 = Central or South American
    03 = Chicano
    04 = Mexican
    05 = Mexicano
    06 = Mexican-American
    07 = Puerto Rican
    08 = Other Spanish
    09 = Other European
    10 = Black
    12 = Asian or Pacific Islander
    17 = All Other (includes American Indian*, another group not listed,
         multiple; two origins - don't know which is main, and unknown,
         refused, or not reported).

         *Due to response errors, the category "American Indian" was
         confounded in 1977 and thereafter has been combined here with the
         "All Other Category."  Persons wishing to undertake
         methodologically oriented analyses of this problem may consult the
         1976 HIS Public Use Person Record, which has shown the components
         of this "All Other" category separately.

 1978-1981 Definition

    01 = Puerto Rican
    02 = Cuban
    03 = Mexican
    04 = Mexicano
    05 = Mexican American
    06 = Chicano
    07 = Other Latin American
    08 = Other Spanish
    09 = Spanish - DK type
    10 = No - Not Spanish origin
    11 = Unknown


APPENDIX E - CODES FOR TYPES OF SPECIAL DWELLING PLACES

 Correctional Institutions

 CODES                               TYPES

  11     State and Federal penitentiaries, prisons, and reformatories

  11     State and Federal prison farms and camps

  11     County and City jails, workhouses, penitentiaries

  11     County and City prison farms and camps

  11     Federal detention headquarters

  12     State and Federal training or industrial schools

  12     County and municipal training or industrial schools

  12     Private schools for delinquents, such as "House of the Good
         Shepherd," "Boys Town," etc.

 Mental Institutions

 CODES                               TYPES

  21     Homes and training schools for mental defectives

  21     Homes, training schools, colonies, and villages for epileptics

  21     State, Federal, County, and City hospitals for mental diseases

  21     Private hospitals and sanitariums for mental disease

  22     Hospitals for the treatment of alcoholics and drug addicts

  23     Veterans Administration mental hospitals

 Homes for the Aged, Infirm. and Needy

 CODES                               TYPES

  31     Orphan Asylums

  31     Children's homes

  32     County homes, almshouses, poor farms, etc.

  33     Fraternal or religious homes for the aged

  34     Commercial boarding house for the aged

  35     Homes and schools for the blind

  36     Homes and schools for the deaf

  37     Hospital or resident schools, orthopedic hospitals, and homes for
         the crippled

  38     Soldiers' and sailors' homes

  39     Veterans Administration homes (domiciliary care)

  40     Nursing, Convalescent and Rest Homes

 Other Hospitals and Homes Providing Specialized Care

 CODES                               TYPES

  51     Tuberculosis sanitariums

  52     Veterans Administration tuberculosis hospitals

  53     Homes for incurables

  54     Chronic and Cancer hospitals

  55     Maternity homes for unmarried mothers

  56     Detention and receiving homes

 Other Special Dwelling Places

  61     Veterans Administration General, Medical and Surgical Hospitals

  62     Facilities for the Treatment of the Physically Ill

         This type of facility treats physical disorders and is one in which
         the patient stays for a relatively short period of time.  Examples
         of this type of special dwelling place are:

              1.  General or emergency hospitals; children's hospital;
                  maternity hospital
              2.  Infirmary

  71     Hotels, Transient-type

  72     YMCA, Transient-type

  73     YWCA, Transient-type

  74     YMEA, Transient-type

  75     Private residential clubs (those that meet the special dwelling
         place definition)

  76     Tourist homes (those that meet the special dwelling place
         definition)

  77     Motel, Transient-type

  78     Tourist camp or court, Transient-type

  79     Groups of 5 or more vacation cabins under single management,
         Transient-type

  80     Combinations tourist-trailer court, Transient-type

 Facilities for Housing Students

  81     School Dormitory

  82     Fraternity

  83     Sorority

  84     Schools with resident students (other than for the needy or infirm
         and other than resident schools with separate codes 93 and 94 --
         see below)

  93     Schools with resident students and with predominantly non-salaried
         faculty such as nuns or priests.

  94     Schools with resident students and operated primarily for religious
         training (other than those with predominantly non-salaried faculty)
         such as Bible Institutes

 Facilities for Housing Workers

  85     Dormitory for workers

  86     Bunkhouse (provided that it has or is expected to have quarters for
         5 or more farm or ranch hands)

  87     Labor Camp

  88     Logging Camp

  89     Migratory workers' camp

 Additional Other Places

  91     Convents

  92     Monasteries

  93     See Facilities for Housing Students

  94     See Facilities for Housing Students

  00     Nurses' Homes

  01     Flophouses

  02     Missions

  03     Recreational and Religious Camps (Adults or Family)

  04     Recreational and Religious Camps (Children's)

  05     Trailer Camps

  06     Tent Camps

  07     Armed Forces Installations

  08     Armed Forces Hospitals

  09     Non-transient Hotel (when instructed to treat as a special dwelling
         place)

  00     Not applicable


APPENDIX F - CONDITION LISTS

 Condition Lists

 Methodological studies, which had been conducted since the beginning of
 the survey, showed that chronic conditions are generally under-reported in
 interviews.  They also indicated that the expansion of a checklist of
 chronic conditions to include as many descriptive titles as possible will
 increase the probability of a person reporting a condition, assuming that he
 is aware of its existence.  These findings led to the decision to restrict
 the collection of prevalence data on chronic conditions to specific types of
 conditions during a given collection year.

     Concentrating on a group of chronic conditions involving a specific
 system of the body (e.g., those affecting the digestive system) rather than
 on the entire spectrum of chronic conditions not only improve the quality of
 response but also permits the collection of more detailed diagnostic
 information related to that body system.  See Appendix I.  The survey plan
 calls for the collection of different types of conditions each year, so that
 within 5 or 6 years after the initiation of this plan, information on the
 prevalence of virtually all chronic conditions will have been obtained.

     For purposes of making prevalence estimates of chronic conditions, a
 list of conditions is read to the respondent.  For each condition reported,
 detailed questions are asked.  From 1968-77 the following six lists of
 conditions were used (one per year except in 1974 when no list was used):

     *  Conditions of the musculoskeletal system and skin:  1969, 1976.

     *  Conditions of the respiratory system:  1970.

     *  Impairments:  1971, 1977.

     *  Conditions of the cardiovascular system:  1972.

     *  Conditions affecting the nervous system, glandular disorders, and
        conditions of the genitourinary system:  1973.

     *  Conditions of the digestive system:  1968, 1975.

 Starting in 1978 and continuing through 1983 a major change in interview
 procedures was made in which all six of the lists of conditions were
 included on the questionnaire.  However, any specific household was asked
 only one list.


APPENDIX G - DEFINITIONS OF CERTAIN TERMS USED IN NHIS

 Terms Relating to Conditions

  Definitions Of Certain Terms Used In The Health Interview Survey

     Condition.  A morbidity condition, or simply a condition, is any entry
 on the questionnaire that describes a departure from a state of physical or
 mental well-being.  It results from a positive response to one of a series
 of "medical-disability impact" or "illness-recall" questions.  In the coding
 and tabulating process conditions are selected or classified according to a
 number of different criteria such as whether they were medically attended,
 whether they resulted in disability, or whether they were acute or chronic;
 or according to the type of disease, injury, impairment, or symptom
 reported.  For the purposes of each published report or set of tables, only
 those conditions recorded on the questionnaire that satisfy certain stated
 criteria are included.

     Conditions except impairments are classified by type according to the
 Eighth and Ninth Revision of the International Classification of Diseases,
 Adapted for Use in the United States, with certain modifications adopted to
 make the code more suitable for a household interview survey.

     Acute Condition.  An acute condition is defined as a condition that has
 lasted less than 3 months and that has involved either medical attention or
 restricted activity.  Because of the procedures used to estimate incidence,
 the acute conditions included in this report are the conditions that had
 their onset during the 2 weeks prior to the interview week and that involved
 either medical attention or restricted activity during that 2-week period.
 However, certain conditions are always classified as chronic regardless of
 onset (see list under the definition of chronic condition).

     Acute Condition Groups.  In this report all tables that have data
 classified by types of condition employ a five-category regrouping plus
 several selected subgroups.

     Chronic Condition.  A condition is considered chronic if (1) the
 condition is described by the respondent as having been first noticed more
 than 3 months before the week of the interview of (2) it is one of the
 conditions listed below that are always considered chronic regardless of the
 date of onset.

     Allergy, any
     Arthritis or rheumatism
     Asthma
     Cancer
     Cleft Palate
     Club foot
     Condition present since birth
     Deafness or serious trouble with hearing
     Diabetes
     Epilepsy
     Hardening of the arteries
     Hay fever
     Heart trouble
     Hemorrhoids or piles
     Hernia or rupture
     High blood pressure
     Kidney stones
     Mental illness
     Missing fingers, hand, or arm-toes, foot, or leg
     Palsy
     Paralysis of any kind
     Permanent stiffness or deformity of the foot, leg, fingers, arm, or back
     Prostate trouble
     Repeated trouble with back or spine
     Rheumatic fever
     Serious trouble with seeing, even when wearing glasses
     Sinus trouble, repeated attacks of
     Speech defect, any
     Stomach ulcer
     Stroke
     Thyroid trouble or goiter
     Tuberculosis
     Tumor, cyst, or growth
     Varicose veins, trouble with

     Prevalence of Conditions.  In general, prevalence of conditions is the
 estimated number of conditions of a specified type existing at a specific
 time or the average number existing during a specified internal of time.
 The prevalence of chronic conditions is defined as the number of chronic
 cases reported to be present or assumed to be present at the time of the
 interview.  Those assumed to be present at the time of the interview are
 cases described by the respondent in terms of one of the diseases on the
 list of conditions always considered chronic (see definition of chronic
 condition above) and reported to have been present at some time during the
 12-month period prior to the interview.

     Incidence of Conditions.  The incidence of conditions is the estimated
 number of conditions having their onset in a specified time period.  As
 previously mentioned, minor acute conditions involving neither restricted
 activity nor medical attention are excluded from the statistics.  The
 incidence data shown in some reports are further limited to various
 subclasses of conditions, such as "incidence of conditions involving bed
 disability."

     Onset of Condition.  A condition is considered to have had its onset
 when it was first noticed.  This could be the time the person first felt
 sick or became injured, or it could be the time when the person or his
 family was first told by a physician that he had a condition of which he was
 previously unaware.

     Persons With Chronic Conditions.  The estiated number of persons with
 chronic conditions is based on the number of persons who at the time of the
 interview were reported to have one or more chronic conditions.

     Activity-Restricting Condition.  An activity-restricting condition is
 one that had its onset in the past 2 weeks and that caused at least 1 day of
 restricted activity during the 2 calendar weeks before the interview week.
 (See "Restricted-activity day" under "Terms Relating to Disability.")

     Bed-Disabling Condition.  A condition with onset in the past 2 weeks
 involving at least 1 day of bed disability is called a bed-disabling
 condition.  (See "Bed-disability day" under "Terms Relating to Disability.")

     Medically Attended Condition.  A condition with onset in the past 2
 weeks is considered medically attended if a physician has been consulted
 about it either at its onset or at any time thereafter.  However, when the
 first medical attention for a condition does not occur until after the end
 of the 2-week period, the case is treated as though there was not medical
 attention.  Medical attention includes consultation either in person or by
 telephone for treatment or advice.  Advice from the physician transmitted to
 the patient through the nurse is counted as well as visits to physicians in
 clinics or hospitals.  If during the course of a single visit the physician
 is consulted about more than one condition for each of several patients,
 each condition of each patient is counted as medically attended.

     Discussions of a child's condition by the physician and a responsible
 member of the household are considered as medical attention even if the
 child was not seen at that time.

     For the purpose of this definition, the term "physician" includes
 doctors of medicine and osteopathic physicians.

Terms Relating to Disability

     Disability.  Disability is the general term used to describe any
 temporary or long-term reduction of a person's activity as a result of an
 acute or chronic condition.

     Disability Day.  Short-term disability days are classified according to
 whether they are days of restricted activity, bed days, hospital days,
 work-loss days, or school-loss days.  All hospital days are, by definition,
 days of bed disability; all days of bed disability are, by definition, days
 of restricted activity.  The converse form of these statements is, of
 course, not true.  Days lost from work and days lost from school are special
 terms that apply to the working and school-age populations only, but these
 too are days of restricted activity.  Hence, "days of restricted activity"
 is the most inclusive term used to describe disability days.

     Restricted-Activity Day.  A day of restricted activity is one on which a
 person cuts down on his usual activities for the whole of that day because
 of an illness or an injury.  The term "usual activities" for any day means
 the things that the person would ordinarily do on that day.  For children
 under school age, usual activities depend on whatever the usual pattern is
 for the child's day, which will in turn be affected by the age of the child,
 weather conditions, and so forth.  For retired or elderly persons, usual
 activities might consist of almost no activity, but cutting down on even a
 small amount for as much as a day would consititute restricted activity.  On
 Sundays or holidays, usual activities are the things the person usually does
 on such days--going to church, playing golf, visiting friends or relatives,
 or staying at home and listening to the radio, reading, watching television,
 and so forth.  Persons who have permanently reduced their usual activities
 because of a chronic condition might not report any restricted--activity
 days during a 2-week period.  Therefore, absence of restricted-activity days
 does not imply normal health.

     Restricted activity does not imply complete inactivity, but it does imly
 only the minimum of usual activities.  A special nap for an hour after lunch
 does not constitute cutting down on usual activities, nor does the
 elimination of a heavy chore such as cleaning ashes out of the furnace or
 hanging out the wash.  If a farmer or housewife carried on only the minimum
 of the day's chores, however, this is a day of restricted activity.

     A day spend in bed or a day home from work or school because of illness
 or injury is, of course, a restricted-activity day.

     Bed-Disability Day.  A day of bed disability is one on which a person
 stays in bed for all or most of the day because of a specific illness or
 injury.  All or most of the day is defined as more than half of the daylight
 hours.  All hospital days for inpatients are considered to be days of bed
 disability even if the patient was not actually in bed at the hospital.

     Work-Loss Day.  A day lost from work is a day on which a person did not
 work at his job or business for at least half of his normal workday because
 of a specific illness or injury.  The number of days lost from work is
 determined only for persons 17 years of age and over who reported that at
 any time during the 2-week period covered by the interview they either
 worked at or had a job or business.  (See "Currently employed persons" under
 "Demographic Terms.")

     School-Loss Day.  A day lost from school is a normal school day on which
 a child did not attend school because of a specific illness or injury.  The
 number of days lost from school is determined only for children 6-16 years
 of age.

     Person-Day.  Person-days of restricted activity, bed disability, and so
 forth are days of the various forms of disability experienced by any one
 person.  The sum of days for all persons in a group represents an
 unduplicated count of all days of disability for the group.

     Condition-Day.  Condition-days of restricted activity, bed disability,
 and so forth are days of the various forms of disability associated with any
 one condition.  Since any particular day of disability may be associated
 with more than one condition, the sum of days for conditions may add to more
 than the total number of person-days.

 Chronic Activity Limitation

 Persons are classified into four categories according to the extent to which
 their activities are limited at present as a result of chronic conditions.
 Since the usual activities of preschool children, school-age children,
 housewives, and workers and other persons differ, a different set of criteria
 is used for each group.  There is a general similarity between them, however,
 as will be seen in the following descriptions of the four categories:

 1.  Persons unable to carry on major activity for their group (major
     activity refers to ability to work, keep house, or engage in school or
     preschool activities).
     Preschool children:
        Inability to take part in ordinary play with other children.
     School age children:
        Inability to go to school.
     Housewives:
        Inability to do any housework.
     Workers and all other persons:
        Inability to work at a job or business.

 2.  Persons limited in amount or kind of major activity performed (major
     activity refers to ability to work, keep house, or engage in school or
     preschool activities).
     Preschool children:
        Limited in amount or kind of play with other children, e.g., need
        special rest periods, cannot play strenuous games, or cannot play for
        long periods at a time.
     School-age children:
        Limited to certain types of schools or in school attendance, e.g.,
        need special schools or special teaching or cannot go to school
        full-time or for long periods at a time.

     Housewives:
        Limited in amount or kind of housework, e.g., cannot lift children,
        wash or iron, or do housework for long periods at a time.
     Workers and all other persons:
        Limited in amount or kind of work, e.g., need special working aids or
        special rest periods at work, cannot work full-time or for long
        periods at a time, or cannot do strenuous work.

 3.  Persons not limited to major activity but otherwise limited (major
     activity refers to ability to work, keep house, or engage in school or
     preschool activities).
     Preschool children:
        Not classified in this category.
     School-age children:
        Not limited in going to school but limited in participation in
        athletics or other extracurricular activities.
     Housewives:
        Not limited in housework but limited in other activities such as
        church, clubs, hobbies, civic projects, or shopping.
     Workers and all other persons:
        Not limited in regular work activities but limited in other
        activities such as church, clubs, hobbies, civic projects, sports, or
        games.

 4.  Persons not limited in activities (includes persons whose activities are
     not limited in any of the ways described above).

 Chronic Mobility Limitation

 Persons are classified into the following five categories according to the
 extent to which their mobility is limited at present as a result of chronic
 conditions:

 1.  Stays in bed.  Must stay in bed all or most of the time.

 2.  Stays in the house.  Must stay in the house, but not in bed, all or most
     of the time.

 3.  Needs help getting around.  Able to go outside but needs the help of
     another person or of a special aid such as a cane or wheelchair in
     getting around.

 4.  Has trouble getting around freely.  Does not need the help of another
     person or special aid but has trouble in getting around freely.

 5.  Is not limited in mobility.  Not limited in any of the ways described
     above.


APPENDIX H - NOTE RE CHANGE IN ICD CODES

     A major change made in 1979 affects the comparison of 1979, 1980, and
 1981 illness data with data from earlier years.  Beginning in 1979,
 illnesses and injuries were coded using the ninth revision of the
 International Classification of Diseases rather than the eighth revision
 used in 1978 and earlier years mentioned in the report.  Caution should
 therefore be used when comparing data in specific disease categories.
 Detailed information on the old and new disease category classification is
 available from the Interview and Examination Statistics Program of the
 National Center for Health Statistics.


APPENDIX I - Changes in questions regarding limitations

      With the introduction of restricting the collection of information on
 chronic conditions to those affecting a specific system (beginning in July
 1967), it was felt that the amount of data relating to the history,
 treatment, and development of such conditions should be increased.  Since
 the new "person approach" called for the collection of information on
 activity and mobility limitation on a person basis, the questions relating
 to limitation were transferred to another area on the questionnaire, and
 detailed information on specific chronic conditions was obtained by adding a
 section identified as AA to each condition page.  Section AA was revised to
 some extent during the trial period (July 1967 - December 1968) and has
 remained as an integral part of the condition page through calendar year
 1981 (see below).

 AA   Continue for conditions listed or reported in probe question 31,
      otherwise go to A5.  For missing extremities or organs, go to A5.

              Doctor seen (12)              Doctor not seen (11)


 11.   During the past 12 months what did -- do or take for his ...?  (Write
       in)

       Anything else?
 (18)


 12.   After -- first noticed something was wrong, about how long was it
       before he talked to a doctor about it?
       (Probe:  Was it a matter of days, weeks, or months?)

       000     Discovered by doctor (14a)       3          Weeks

       100     Less than one day                4          Months

         2     Days                             5          Years


 13.   BEFORE -- talked to a doctor about his ..., did he do or take anything
       for it?

       1   Y          2   N


 14a.  Does -- NOW take any medicine or treatment for his ...?

       1   Y          2   N

   b.  Was any of this medicine or treatment recommended by a doctor?

       1   Y          2   N


 15.   Has he ever had surgery for this condition?

       1   Y          2   N


 16.   Was he ever hospitalized for this condition?

       1   Y          2   N


 17.   During the past 12 months, about how many times has -- seen or talked
       to a doctor about his ...?
       (Do not count visits while a patient in a hospital.)

           Times      000     None


 18.   About how many days during the past 12 months has this condition kept
       him in bed all or most of the day?

           Times      000     None


 19a.  How often does his ... bother him - all of the time, often, once in a
       while, or never?

       1     All the time        2     Often            3     Once in a while

       0     Never (19c)         4     Other - Specify


   b.  When it does bother him, is he bothered a great deal, some, or very
       little?

       1     Great deal          2     Some             3     Very little

       4     Other - Specify

           All the time in 19a (A5)

   c.  Does -- still have this condition?

       a  Y (A5)          N


   d.  Is this condition completely cured or is it under control?

       2     Cured               3     Under control (A5)

       4     Other - Specify


   e.  About how long did -- have this condition before it was cured?

       0     Less than one month            Months            Years




This page last reviewed: Thursday, January 28, 2016
This information is provided as technical reference material. Please contact us at cwus@cdc.gov to request a simple text version of this document.
TOP