National Comorbidity Survey: Baseline (NCS-1), 1990-1992 (Restricted Version) (ICPSR 25381)

Version Date: Mar 30, 2016 View help for published

Principal Investigator(s): View help for Principal Investigator(s)
Ronald C. Kessler, University of Michigan. Institute for Social Research. Survey Research Center


Version V3

The National Comorbidity Survey: Baseline (NCS-1) is a collaborative epidemiologic investigation designed to study the prevalence and patterns of disorders in the third and revised edition of the Diagnostic and Statistical Manual of Mental Disorders (DSM III-R) as well as correlates of service utilization for these disorders. The NCS-1 was the first survey to administer a structured psychiatric interview to a nationally representative sample and was carried out in the early 1990s with a household sample of over 8,000 respondents. Diagnoses were based on a modified version of the Composite International Diagnostic Interview (the UM-CIDI), which was developed at the University of Michigan for the NCS-1. This restricted-use data collection contains the following geographic variables that can be linked to the public-use version of the data using the CASEID variable: Census State FIPS codes, Census County FIPS codes, and Census 5-Digit County-State FIPS codes. However, in order to help preserve the confidentiality of the data the frequency tables in the codebook have been suppressed.

Kessler, Ronald C. National Comorbidity Survey: Baseline (NCS-1), 1990-1992 (Restricted Version). Ann Arbor, MI: Inter-university Consortium for Political and Social Research [distributor], 2016-03-30.

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United States Department of Health and Human Services. National Institutes of Health. National Institute of Mental Health (R01 MH/DA46376, R01 MH49098 (NIMH)), United States Department of Health and Human Services. National Institutes of Health. National Institute on Drug Abuse (supplement to R01 MH/DA46376 (NIDA)), William T. Grant Foundation (90135190 (W.T. Grant Foundation))

This is a restricted-use version of the National Comorbidity Survey: Baseline (NCS-1), 1990-1992 (ICPSR 6693). Interested users can apply for access to these data through the ICPSR Data Access Request System (IDARS). For more information about accessing restricted-use data, please visit ICPSR's Restricted-Use Data Management page.

The file contains 4 variables, CASEID (to link with the public-use data files), and the state/county level geographic variables. Users must refer to ICPSR 6693 for the public-use files.

Inter-university Consortium for Political and Social Research
1990 -- 1992
1990-09-14 -- 1992-02-06
  1. The public-use version of NCS-1 can be accessed by visiting the public-use NCS-1 study home page (ICPSR 6693).

  2. Users are reminded that NCS-1 Part I, Part II, and Tobacco Use Supplement variables are all contained in Dataset 1, the public-use NCS-1 Main Data file (ICPSR 6693). The DSM-III-R diagnosis and demographic variables are contained in Dataset 2, the NCS-1 Diagnosis/Demographic Data file (ICPSR 6693).

  3. For more information about the National Comorbidity Surveys (NCS), please visit the NCS Web site.


Stratified, multistage area probability sample. The inclusion of respondents as young as 15 years, compared with the 18-year-old lower age limit found in most general population surveys, was based on an interest in minimizing recall bias of early-onset disorders. The exclusion of respondents aged older than 54 years was based on evidence from the Epidemiologic Catchment Area Study that active comorbidity between substance use disorders and nonsubstance psychiatric disorders is much lower among persons older than 54 years than among those aged 54 years and younger. The Part II NCS-1 survey was administered to a subsample of 5,877 respondents. The Tobacco Use Supplement was completed by a subsample of 4,414 respondents. The NCS-1 also includes a supplemental sample of students living in campus group housing and a nonrespondent survey.

Persons aged 15 to 54 years in the noninstitutionalized civilian population in the 48 continuous United States.


The response rate was 82.6 percent.



2018-02-15 The citation of this study may have changed due to the new version control system that has been implemented. The previous citation was:
  • Kessler, Ronald C. National Comorbidity Survey: Baseline (NCS-1), 1990-1992 (Restricted Version). ICPSR25381-v3. Ann Arbor, MI: Inter-university Consortium for Political and Social Research [distributor], 2016-03-25.

2016-03-30 The codebook has been updated with suppressed frequency tables to preserve confidentiality.

2016-03-25 This collection has been updated to include SPSS, SAS, and Stata data and setup files, a tab-delimited data file, an R data file, and a PDF codebook. The metadata has also been updated to reflect the contents of the data files included in this version of the collection.


The data are not weighted.



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  • One or more files in this data collection have special restrictions. Restricted data files are not available for direct download from the website; click on the Restricted Data button to learn more.