The British Journal of Psychiatry (2006) 188: 465-471. doi: 10.1192/bjp.188.5.465
© 2006 The Royal College of Psychiatrists
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Lifetime and 12-month prevalence of mental disorders in the Nigerian Survey of Mental Health and Well-Being

OYE GUREJE, MBBS, PhD, DSc, FRCPsych and VICTOR O. LASEBIKAN, MBBS, MPH, FWACP

Department of Psychiatry, University of Ibadan

LOLA KOLA, MSc, MSW

Department of Medical Social Services

VICTOR A. MAKANJUOLA, MBBS

Department of Psychiatry, University College Hospital, Ibadan, Nigeria

Correspondence: Professor Oye Gureje, Department of Psychiatry, University College Hospital, PMB 5116, Ibadan, Nigeria. Tel: +234 2 2410 146; e-mail: ogureje{at}comui.edu.ng

Declaration of interest None. Funding detailed in Acknowledgements.

Background Large-scale community studies of the prevalence of mental disorders using standardised assessment tools are rare in sub-Saharan Africa.

Aims To conduct such a study.

Method Multistage stratified clustered sampling of households in the Yoruba-speaking parts of Nigeria. Face-to-face interviews used the World Mental Health version of the Composite International Diagnostic Interview (WMH–CIDI).

Results Of the 4984 people interviewed (response rate 79.9%), 12.1% had a lifetime rate of at least one DSM–IV disorder and 5.8% had 12-month disorders. Anxiety disorders were the most common (5.7% lifetime, 4.1% 12-month rates) but virtually no generalised anxiety or post-traumatic stress disorder were identified. Of the 23% who had seriously disabling disorders, only about 8% had received treatment in the preceding 12 months. Treatment was mostly provided by general medical practitioners; only a few were treated by alternative practitioners such as traditional healers.

Conclusions The observed low rates seem to reflect demographic and ascertainment factors. There was a large burden of unmet need for care among people with serious disorders.


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