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Cannabis use and misuse prevalence among people with psychosis

Community Forensic Mental Health Service, Brisbane

ROSS YOUNG

School of Psychology and Counselling, Faculty of Health, Queensland of University of Technology, Carseldine

DAVID KAVANAGH, PhD

Department of Psychiatry, Central Clinical Division, University of Queensland, Brisbane, Australia

Correspondence: Bob Green, Community Forensic Mental Health Service, 42 Albert Street, Brisbane 4001, Australia.Tel: +61 (0)7 7 3221 2511; fax: +61 (0)7 7 3221 6060; e-mail: bob_green{at}health.qld.gov.au

Declaration of interest None.

Background Increasing attention has been given by researchers to cannabis use in individuals with psychosis. As psychoses are relatively low-prevalence disorders, research has been mostly been restricted to small-scale studies of treatment samples. The reported prevalence estimates obtained from these studies vary widely.

Aims To provide prevalence estimates based on larger samples and to examine sources of variability in prevalence estimates across studies.

Method Data from 53 studies of treatment samples and 5 epidemiological studies were analysed.

Results Based on treatment sample data, prevalence estimates were calculated for current use (23.0%), current misuse (11.3%), 12-month use (29.2%), 12-month misuse (18.8%), lifetime use (42.1%) and lifetime misuse (22.5%). Epidemiological studies consistently reported higher cannabis use and misuse prevalence in people with psychosis.

Conclusions The factor most consistently associated with increased odds of cannabis prevalence was specificity of diagnosis. Factors such as consumption patterns and study design merit further consideration.

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