World Mental Health Survey, Nigeria, 2002-2003 Version 1

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. 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 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. 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. Response Rates: The overall response rate for this survey was 79.30%. Presence of Common Scales: Composite International Diagnostic Interview (CIDI) Version 3.0 Datasets: DS0: Study-Level Files DS1: Public-Use Cleaned Nigeria Data DS2: Restricted-Use Cleaned Nigeria Data DS3: Restricted-Use Raw Nigeria Data 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. paper and pencil interview (PAPI)For additional information on The World Mental Health (WMH) Survey Initiative, please visit The World Mental Health Survey Initiative website.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.