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Examining interactions between risk factors for psychosis

Zammit, Stanley, Lewis, Glyn, Dalman, Christina and Allebeck, Peter 2010. Examining interactions between risk factors for psychosis. British Journal of Psychiatry 197 (3) , pp. 207-211. 10.1192/bjp.bp.109.070904

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Background For complex multifactorial diseases it seems likely that co-exposure to two risk factors will show a greater than additive relationship on disease risk. Aims To test whether greater than additive relationships occur between risk factors for psychosis. Method A cohort study of 50 053 Swedish conscripts. Data on IQ, cannabis use, psychiatric diagnoses, disturbed behaviour and social relations assessed at age 18 were linked to admissions with any non-affective psychoses over a 27-year follow-up period. Statistical interactions between risk factors were examined under both additive and multiplicative models. Results There was some evidence of interaction for eight of the ten combinations of risk factors under additive models, but for only one combination under multiplicative models. Conclusions Multiplicative models describe the joint effect of risk factors more adequately than additive ones do. However, the implications of finding interactions as observed here, or for most interactions reported to date, remain very limited.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Medicine
MRC Centre for Neuropsychiatric Genetics and Genomics (CNGG)
Subjects: R Medicine > RC Internal medicine > RC0321 Neuroscience. Biological psychiatry. Neuropsychiatry
Publisher: Royal College of Psychiatrists
ISSN: 0007-1250
Last Modified: 04 Jun 2017 03:54

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