Scientific Data DocumentationSummary FileDSN: 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
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