National Addiction & HIV Data Archive Program

This study is maintained and distributed by the National Addiction & HIV Data Archive Program (NAHDAP). NAHDAP is supported by the National Institute on Drug Abuse (NIDA), part of the National Institutes of Health (NIH).

National Comorbidity Survey: Reinterview (NCS-2), 2001-2002 [Restricted-Use] (ICPSR 30921)

Alternate Title:  NCS-2, 2001-2002

Principal Investigator(s):


The NCS-2 was a reinterview of people who participated in the Baseline (NCS-1), carried out a decade after the initial baseline survey. The aim was to collect information about changes in mental disorders, substance use disorders, and the predictors and consequences of these changes over the ten years between the two surveys. The collection contains three parts: the main survey, demographic data, and diagnostic data. In the main survey, respondents were asked about general physical and mental health. Questions focused on a variety of health issues, including limitations caused by respondents' health issues, substance use, childhood health, life-threatening illnesses, chronic conditions, medications taken in the past 12 months, level of functioning and symptoms experienced in the past 30 days, and any services used by the respondents since the (NCS-1). Additional questions focused on mental disorders including depression, bipolar disorder, specific and social phobias, generalized anxiety, intermittent explosive disorder, suicidality, post-traumatic stress disorder, neurasthenia, pre-menstrual dysphoric disorder, attention deficit/hyperactivity disorder, oppositional defiant disorder, conduct disorder, and separation anxiety. Respondents were also asked about their lives in general, with topics including employment, finances, marriage, children, their social lives, and stressful life events experienced in the past 12 months. Additionally, two personality assessments were included consisting of respondents' opinions on whether various true/false statements accurately described their personalities. Another focus of the main survey dealt with substance use and abuse, nonmedical use of prescription drugs, and polysubstance use. Part two contains demographic and other background information including age, education, employment, household composition, household income, marital status, and region. Part three of the collection focused on whether respondents met diagnostic criteria for psychological disorders asked about in the main survey. Interview questions in the NCS-2 Main Survey were customized to each respondent based on previous responses in the Baseline (NCS-1).

Series: National Comorbidity Survey (NCS) Series

Access Notes

  • One or more files in this study are not available for download due to special restrictions ; consult the restrictions note to learn more. You can apply online for access to the data. A login is required to apply for access.

    Access to the (NCS-2) is restricted. Users interested in obtaining these data must complete a Restricted Data Use Agreement, which can be accessed via the study home page.

  • These data are available to the general public.


DS0:  Study-Level Files
DS1:  Main Survey Restricted-Use
No downloadable data files available.
DS2:  Demographic Data Restricted-Use
No downloadable data files available.
DS3:  Diagnostic Data Restricted-Use
No downloadable data files available.

Study Description


Kessler, Ronald. National Comorbidity Survey: Reinterview (NCS-2), 2001-2002 [Restricted-Use]. ICPSR30921-v1. Ann Arbor, MI: Inter-university Consortium for Political and Social Research [distributor], 2013-04-03.

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Scope of Study

Subject Terms:   alcohol, alcohol consumption, anxiety, childhood, children, chronic disabilities, chronic illnesses, depression (psychology), disabilities, drug abuse, drug treatment, drug use, drugs, emotional disorders, employment, fatigue, finance, financial assets, hallucinogens, health problems, health status, heroin, inhalants, life events, marijuana, marriage, medications, mental disorders, mental health, mental health services, personality assessment, post-traumatic stress disorder, prescription drugs, psychiatric services, psychological effects, psychological wellbeing, psychosocial assessment, sedatives, self medication, smoking, social attitudes, social behavior, social history, social life, stimulants, substance abuse, suicide, tobacco products, tobacco use, tranquilizers

Smallest Geographic Unit:   region

Geographic Coverage:   United States

Time Period:  

  • 2001-02

Date of Collection:  

  • 2001-02

Unit of Observation:   individual

Universe:   The population for NCS-1 included persons aged 15 to 54 years in the noninstitutionalized civilian population in the 48 contiguous United States. NCS-2 is a reinterview of that population, ten years after the NCS-1 survey.

Data Types:   survey data

Data Collection Notes:

Please refer to these related National Comorbidity Survey data collections: ICPSR 6693, National Comorbidity Survey: Baseline (NCS-1), 1990-1992; ICPSR 28581, National Comorbidity Survey: Adolescent Supplement (NCS-A), 2001-2004; ICPSR 25381, National Comorbidity Survey: Baseline (NCS-1), 1990-1992 (Restricted Version).

For more information on the National Comorbidity Survey, please visit the NCS Web site.


Time Method:   Cross-sectional ad-hoc follow-up

Weight:   The data are not weighted. Dataset 2 contains the weight variable NCS2WEIGHT, which should be used in analysis. No additional weight information was provided.

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

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:

  • Created variable labels and/or value labels.
  • Checked for undocumented or out-of-range codes.


Original ICPSR Release:  

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