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Cannabis use and psychosis: re-visiting the role of childhood trauma

  • J. E. Houston (a1), J. Murphy (a2), M. Shevlin (a2) and G. Adamson (a2)
Abstract
Background

Cannabis consumption continues to be identified as a causal agent in the onset and development of psychosis. However, recent findings have shown that the effect of cannabis on psychosis may be moderated by childhood traumatic experiences.

Method

Using hierarchical multivariate logistic analyses the current study examined both the independent effect of cannabis consumption on psychosis diagnosis and the combined effect of cannabis consumption and childhood sexual abuse on psychosis diagnosis using data from the Adult Psychiatric Morbidity Survey 2007 (n=7403).

Results

Findings suggested that cannabis consumption was predictive of psychosis diagnosis in a bivariate model; however, when estimated within a multivariate model that included childhood sexual abuse, the effect of cannabis use was attenuated and was not statistically significant. The multivariate analysis revealed that those who had experienced non-consensual sex in childhood were over six times [odds ratio (OR) 6.10] more likely to have had a diagnosis of psychosis compared with those who had not experienced this trauma. There was also a significant interaction. Individuals with a history of non-consensual sexual experience and cannabis consumption were over seven times more likely (OR 7.84) to have been diagnosed with psychosis compared with those without these experiences; however, this finding must be interpreted with caution as it emerged within an overall analytical step which was non-significant.

Conclusions

Future studies examining the effect of cannabis consumption on psychosis should adjust analyses for childhood trauma. Childhood trauma may advance existing gene–environment conceptualisations of the cannabis–psychosis link.

Copyright
Corresponding author
*Address for correspondence: J. E. Houston, Ph.D., Division of Psychology, Nottingham Trent University, Burton Street, Nottingham NG1 4BU, UK. (Email: james.houston@ntu.ac.uk)
Linked references
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This list contains references from the content that can be linked to their source. For a full set of references and notes please see the PDF or HTML where available.

DM Fergusson , R Poulton , PF Smith , JM Boden (2006). Cannabis and psychosis. British Medical Journal 332, 172176.

CK Enders (2001). The performance of the full information maximum likelihood estimator in multiple regression models with missing data. Educational and Psychological Measurement 61, 713740.

J Read , A Fraser (1998). Abuse histories of psychiatric inpatients: to ask or not to ask. Psychiatric Services 49, 355359.

J Read , BD Perry , A Moskowitz , J Connolly (2001). The contribution of early traumatic events to schizophrenia in some patients: a traumagenic neurodevelopmental model. Psychiatry 64, 319345.

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Psychological Medicine
  • ISSN: 0033-2917
  • EISSN: 1469-8978
  • URL: /core/journals/psychological-medicine
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