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Schizophrenia Bulletin Advance Access originally published online on June 22, 2007
Schizophrenia Bulletin 2008 34(1):193-199; doi:10.1093/schbul/sbm069
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© The Author 2007. Published by Oxford University Press on behalf of the Maryland Psychiatric Research Center. All rights reserved. For permissions, please email: journals.permissions@oxfordjournals.org.

Cumulative Traumas and Psychosis: an Analysis of the National Comorbidity Survey and the British Psychiatric Morbidity Survey

Mark Shevlin1,2, James E. Houston2, Martin J. Dorahy3,4 and Gary Adamson2
2 School of Psychology, University of Ulster at Magee College, Londonderry, Northern Ireland
3 The Trauma Resource Centre, The Belfast HSS Trust
4 School of Psychology, The Queen's University of Belfast

1 To whom correspondence should be addressed; tel.: +44-28-7137561, fax: +44-28-71375493, e-mail: m.shevlin{at}ulster.ac.uk.

Previous research has shown that traumatic life events are associated with a diagnosis of psychosis. Rather than focus on particular events, this study aimed to estimate the effect of cumulative traumatic experiences on psychosis. The study was based on 2 large community samples (The National Comorbidity Survey [NCS], The British Psychiatric Morbidity Survey [BPMS]). All analyses were conducted using hierarchical binary logistic regression, with psychosis diagnosis as the dependent variable. Background demographic variables were included in the first block, in addition to alcohol/drug dependence and depression. A variable indicating the number of traumas experienced was entered in the second block. Experiencing 2 or more trauma types significantly predicted psychosis, and there appeared to be a dose-response type relationship. Particular traumatic experiences have been implicated in the etiology of psychosis. Consistent with previous research, molestation and physical abuse were significant predictors of psychosis using the NCS, whereas for the BPMS, serious injury or assault and violence in the home were statistically significant. This study indicated the added risk of multiple traumatic experiences.

Keywords: psychosis / trauma / community samples


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