National Comorbidity Survey: Adolescent Supplement (NCS-A), 2001-2004 (ICPSR 28581)

Principal Investigator(s): Kessler, Ronald C., Harvard Medical School. Department of Health Care Policy


The National Comorbidity Survey Replication Adolescent Supplement (NCS-A) was designed to estimate the lifetime-to-date and current prevalence, age-of-onset distributions, course, and comorbidity of DSM-IV disorders in the child and adolescent years of life among adolescents in the United States; to identify risk and protective factors for the onset and persistence of these disorders; to describe patterns and correlates of service use for these disorders; and to lay the groundwork for subsequent follow-up studies that can be used to identify early expressions of adult mental disorders.

In addition to interviewing adolescents, information was collected from a parent or a parent surrogate to obtain an additional perspective on the adolescent's mental health and its correlates. Information from parents focused on the five adolescent disorders for which previous methodological research has most consistently shown that parental reports are important for making diagnoses: attention-deficit/hyperactivity disorder, conduct disorder, oppositional defiant disorder, major depressive episode, and dysthymic disorder.

The study contains four data files: (1) data for the adolescent household and school respondents; (2) data for the parents who responded to the long self-administered questionnaire; (3) data for the parents who responded to both the long self-administered questionnaire and the short telephone interview; and (4) diagnostic variables based on information collected from both adolescents and parents.

Demographic information includes age, citizenship status, country of birth, criminal history, ethnicity, grandparents' country of birth, language(s) spoken in the home, parents' country of birth, race, religion, and sex.

Access Notes

  • One or more files in this data collection have special restrictions ; consult the restrictions note to learn more. You can apply online for access to the restricted-use data. A login is required to apply.

    The data files are restricted from general dissemination for reasons of confidentiality. Users interested in obtaining these data must complete an Agreement for the Use of Confidential Data, specify the reasons for the request, and obtain IRB approval or notice of exemption for their research. Apply for access to these data through the ICPSR restricted data contract portal, which can be accessed via the <a href="">study home page</a>.

    Any public-use data files in this collection are available for access by the general public. Access does not require affiliation with an ICPSR member institution.

  • Health and Medical Care Archive

    This study is maintained and distributed by the Health and Medical Care Archive (HMCA). HMCA is the official data archive of the Robert Wood Johnson Foundation.


DS0:  Study-Level Files
DS1:  Adolescent Household and School Respondents - Download All Files (387.688 MB) large file

ASCII + SAS Setup    SPSS Setup    Stata Setup    Other
DS2:  Parent Self-Administered Questionnaire (PSAQ) - Download All Files (90.68 MB)

ASCII + SAS Setup    SPSS Setup    Stata Setup    Other
DS3:  Parent Self-Administered Questionnaire (PSAQ) and Telephone Interview (PIP) - Download All Files (31.082 MB)

ASCII + SAS Setup    SPSS Setup    Stata Setup    Other
DS4:  Diagnostic Variables From Both Adolescents and Parents - Download All Files (18.54 MB)

ASCII + SAS Setup    SPSS Setup    Stata Setup    Other

Study Description


Kessler, Ronald C. National Comorbidity Survey: Adolescent Supplement (NCS-A), 2001-2004. ICPSR28581-v5. Ann Arbor, MI: Inter-university Consortium for Political and Social Research [distributor], 2013-08-28.

Persistent URL:

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This study was funded by:

  • United States Department of Health and Human Services. National Institutes of Health. National Institute of Mental Health (U01-MH60220)
  • United States Department of Health and Human Services. National Institutes of Health. National Institute of Drug Abuse (R01-DA12058-05)
  • United States Department of Health and Human Services. Substance Abuse and Mental Health Services Administration
  • Robert Wood Johnson Foundation (Grant 044780)
  • John W. Alden Trust

Scope of Study

Subject Terms:   adolescents, health services utilization, mental disorders, mental health, mental health services, parents, psychiatric services, young adults

Geographic Coverage:   United States

Time Period:  

Date of Collection:  

Unit of Observation:   individual

Data Types:   survey data

Data Collection Notes:

ICPSR processing notes have been added to the User Guide.

The Codebook for Dataset 1 (Adolescent Household and School Respondents) is provided in two formats: PDF and HTML. The latter is supplied as a series of HTML files in a ZIP archive. In the ZIP archive, the file named Contents.html is the "homepage" with links to the other HTML files.

ICPSR generated the SAS, SPSS, and Stata setups and the ASCII, SPSS, and Stata versions of the data from the original SAS files provided by the principal investigator. The SAS special missing value codes D and R in the SAS files were recoded in the ASCII and SPSS data files: D was recoded to 8, 98, 998, or 9998 depending on the size of the variable, and R was recoded to 9, 99, 999, or 9999. In addition, the SAS missing value code denoted by a single period (.) was recoded to blank field in the ASCII data files and to the SPSS system missing value in the SPSS data files.

Only the SAS data files include value labels for the top and bottom codes (e.g., "20 or more" and "5 and under"). These labels are not included in the SPSS and Stata data files or the SAS, SPSS, and Stata setups.


Sample:   NCS-A was originally designed to obtain the sample of adolescents from those residing in National Comorbidity Survey- Replication (NCS-R) households. However, the number of such youths was too small to generate the target sample of 10,000 respondents. Consequently, the households sample was supplemented by adding a school-based sample, leading to a dual frame design. One sample was recruited from the NCS-R households and the other from a representative sample of schools in the same communities as the NCS-R households. All schools (public and private, schools for gifted children, therapeutic schools, etc.) were included in their true population proportions. A stratified probability sample of students was selected from each school to participate in the survey.

Weight:   The data were weighted for within household probability of selection (only in the household sample) and for residual discrepancies between the sample and population on a wide range of census sociodemographic and geographic variables. Please refer to the user guide to obtain weighting information for each part.

Mode of Data Collection:   computer-assisted personal interview (CAPI), computer-assisted telephone interview (CATI), telephone interview

Response Rates:  

The response rate of adolescents in the household sample was 85.9 percent, yielding 904 interviews, conditional (on adult participation in the NCS-R).

The response rate of adolescents in the school sample was 74.7 percent, yielding 9,244 interviews.

Extent of Processing:  ICPSR data undergo a confidentiality review and are altered when necessary to limit the risk of disclosure. ICPSR also routinely creates ready-to-go data files along with setups in the major statistical software formats as well as standard codebooks to accompany the data. In addition to these procedures, ICPSR performed the following processing steps for this data collection:

  • Performed consistency checks.


Original ICPSR Release:   2011-07-27

Version History:

  • 2016-07-29 (1) A Zip archive with the diagnostic scoring algorithms was added to the data collection. (2) Descriptions of the values for the variable REGION (Census Region) in Dataset 1 (Adolescent Household and School Respondents) were added to the technical documentation and value labels for REGION were added to the setups and SAS, Stata and SPSS data files.
  • 2013-08-28 Variable RESPGENDER (Respondent's Gender) in Dataset 1 (Adolescent Household and School Respondents) has been corrected. The previous version of this variable had incorrect values for 1,034 cases.
  • 2011-10-24 The setup files and documentation were added to the restricted release. Those files were already available through the public release.
  • 2011-10-20 The Stata setup and ready-to-go files and the tab-delimited files were released.
  • 2011-10-12 The HTML codebook was changed to be available for public use. Also, the statistical files were replaced because the previous version of the data contained incorrect decimal corrections across statistical packages. The SAS and Stata files were changed so that the original special missing value coding was not lost.

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