World Mental Health Survey, Nigeria, 2002-2003 (ICPSR 39537)

Version Date: Apr 16, 2026

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Principal Investigator(s):
Oye Gureje, University of Ibadan; Olusola Adeyemi, Federal Neuropsychiatric Hospital, Kaduna; Owoidoho Udofia, University of Ibadan; Richard Uwakwe, University of Ibadan; Abba Wakil, University of Ibadan

Series:

https://doi.org/10.3886/ICPSR39537.v1

Version V1

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Summary

The World Mental Health (WMH) Survey Initiative was a coordinated series of general population surveys of mental, substance use, and behavioral disorders conducted in countries across all World Health Organization (WHO) regions. The approach taken by WMH was to conduct rigorous general population surveys in nationally representative samples in many countries throughout the world, to generate data from these surveys on the prevalence, severity, course, and treatment of mental disorders. Data were collected using the WHO Composite International Diagnostic Interview (CIDI) which uses both ICD-10 and DSM-III diagnostic criteria. This survey was conducted in Nigeria and utilized the Efik, Hausa, Igbo, and Yoruba versions of the CIDI.

Citation

Gureje, Oye, Adeyemi, Olusola, Udofia, Owoidoho, Uwakwe, Richard, and Wakil, Abba. World Mental Health Survey, Nigeria, 2002-2003. Inter-university Consortium for Political and Social Research [distributor], 2026-04-16. https://doi.org/10.3886/ICPSR39537.v1

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Funding

GlaxoSmithKline, Bristol-Myers Squibb Company, United States Department of Health and Human Services. National Institutes of Health. National Institute of Mental Health (R01 MH070884), John D. and Catherine T. MacArthur Foundation, Pfizer Foundation, United States. Public Health Service (R13-MH066849; R01-MH069864; R01-DA016558), United States Department of Health and Human Services. National Institutes of Health. Fogarty International Center (R03-TW006481), Pan American Health Organization, Eli Lilly and Company, Ortho-McNeil

Subject Terms

Geographic Coverage

Restrictions

This data collection may not be used for any purpose other than statistical reporting and analysis. Use of these data to learn the identity of any person or establishment is prohibited. To protect respondent privacy, the data file in this collection is restricted from general dissemination. To obtain this restricted file, researchers must agree to the terms and conditions of a Restricted Data Use Agreement.

Distributor(s)

Inter-university Consortium for Political and Social Research
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Time Period(s)

2002 -- 2003

Date of Collection

2002-02-01 -- 2003-05-31

Data Collection Notes

  1. For additional information on The World Mental Health (WMH) Survey Initiative, please visit The World Mental Health Survey Initiative website.

  2. Supporting documentation to distinguish Part I and II of the survey was not included. Users can utilize crosstabs on the weight variables FINALP1WT and FINALP2WT to determine whether variables in Datasets 1 and 2 were derived from Part I or II of the survey:

    • If a participant without valid values for FINALP2WT responded to a variable, that variable is in Part I of the survey.
    • Variables that only have responses from participants with FINALP2WT valid values are in Part II of the survey.

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Study Purpose

The WMH Survey Initiative was designed to fill major gaps in global mental health data. Earlier estimates of the burden of mental and addictive disorders relied largely on literature reviews and isolated studies. WMH surveys provide nationally or regionally representative data to:

  • Estimate the prevalence and distribution of mental, substance use, and behavioral disorders
  • Identify risk and protective factors to inform prevention and intervention strategies
  • Describe patterns of service use, unmet need, and barriers to care
  • Improve estimates of the global burden of disease attributable to mental disorders for public health planning

Study Design

The survey was administered in two parts. Part I was administered to all respondents. Part II was administered to a probability sub-sample of respondents based on responses to the Part I questions. In addition, a probability subsample of other Part I respondents (i.e., those who did not meet criteria for any core disorder) was also selected to complete Part II, while interviews with the remaining non-cases were ended after the completion of the Part I questions.

Time Method

Cross-sectional

Universe

Yoruba, Hausa, Igbo, or Efik speaking adults aged 18 or older living residences in the six geo-political regions (SW, NCent, SE, South-South, NE and NW) of Nigeria, including seasonal residences; representative of the national population.

Unit(s) of Observation

Individual

Data Type(s)

Mode of Data Collection

Response Rates

The overall response rate for this survey was 79.30%.

Presence of Common Scales

Composite International Diagnostic Interview (CIDI) Version 3.0

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Original Release Date

2026-04-16

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Weight

The final analysis weight (FINALP1WT) for each respondent was computed as the product of three weight components: the selection weight factor for the respondent, the nonresponse weight adjustment factor for the respondent, and the post-stratification factor for the respondent. The final analysis weight (FINALP2WT) for each respondent administered Part II was computed similarly to FINALP1WT for that subsample of respondents. As a practical matter for analysts, the following decision rules should be applied when selecting the weight to use. When using only variables from Part I, the FINALP1WT weight variable should be used. For analyses with only Part II or a combination of Part I and Part II variables, the Part II weight or FINALP2WT should be used.

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Notes