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

Alternate Title:   NCS-2, 2001-2002

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


The NCS-2 was a re-interview of 5,001 individuals who participated in the Baseline (NCS-1). The study was conducted 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 major sections: 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. Interview questions in the NCS-2 Main Survey were customized to each respondent based on previous responses in the Baseline (NCS-1).

The second part contains demographic and other background information including age, education, employment, household composition, household income, marital status, and region.

The third part focuses on whether respondents met diagnostic criteria for psychological disorders asked about in the main survey.

Series: National Comorbidity Survey (NCS) Series

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.

    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.

    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.


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

Study Description


Kessler, Ronald. National Comorbidity Survey: Reinterview (NCS-2), 2001-2002 [Restricted-Use]. ICPSR30921-v2. Ann Arbor, MI: Inter-university Consortium for Political and Social Research [distributor], 2016-07-29.

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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--2002

Date of Collection:   

  • 2001--2002

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 Type(s):    survey data

Data Collection Notes:

The variable RESPID, which is a unique respondent identification number, corresponds to the same identification number assigned in the NCS-1 Baseline file under the variable name CASEID. When merging the two datasets together please rename CASEID to RESPID in the Baseline file prior to the merge occurring.

Users should be aware that when merging the NCS-2 data to the NCS-1 baseline data, the Demographic and Diagnostic sections use some of the same variable names. These variables in one of the files (NCS-1 or NCS-2) will need to be renamed before merging in order for the merged file to retain these variables from each dataset.

The data file for the Main Survey (DS0001) does not contain value labels or missing value assignments at this time. These will be added at a later time. Note the data do contain user-assigned missing values. Please reference the questionnaire to obtain labels for the values of individual variables. Because of the lack of labels the codebook for the Main Survey does not contain any frequency tables at this time.

The Demographic (DS0002) and Diagnostic (DS0003) data files do contain value labels and missing values assignments. Therefore, the codebooks for these two parts do contain frequency tables.

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


Time Method:    Longitudinal: Panel

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)


Original ICPSR Release:   2013-04-03

Version History:

  • 2016-07-29 Codebooks and questionnaires were released and made available for download.

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