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BMJ. 2001 Dec 8;323(7325):1336-8.

Incidence of schizophrenia in ethnic minorities in London: ecological study into interactions with environment.

Author information

1
Division of Psychiological Medicine, Institute of Psychiatry, Denmark Hill, London, UK. j.kelly@iop.kcl.ac.uk

Abstract

OBJECTIVE:

To determine whether the incidence of schizophrenia among people from non-white ethnic minorities is greater in neighbourhoods where they constitute a smaller proportion of the total population.

DESIGN:

Ecological design including retrospective study of case records to calculate the incidence of schizophrenia in the ethnic minority population across electoral wards and multi-level analysis to examine interaction between individuals and environment.

SETTING:

15 electoral wards in Camberwell, South London.

PARTICIPANTS:

All people aged 16 years and over who had contact with psychiatric services during 1988-97.

MAIN OUTCOME MEASURE:

Incidence rates of schizophrenia according to Research Diagnostic Criteria.

RESULTS:

The incidence of schizophrenia in non-white ethnic minorities increased significantly as the proportion of such minorities in the local population fell. The incidence rate ratio varied in a dose-response fashion from 2.38 (95% confidence interval 1.49 to 3.79) in the third of wards where non-white ethnic minorities formed the largest proportion (28-57%) of the local population to 4.4 (2.49 to 7.75) in the third of wards where they formed the smallest proportion (8-22%).

CONCLUSION:

The incidence of schizophrenia in non-white ethnic minorities in London is greater when they comprise a smaller proportion of the local population.

PMID:
11739218
PMCID:
PMC60671
[Indexed for MEDLINE]
Free PMC Article
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