Impact of substance use and other risk factor exposures on conviction rates by people with a psychotic illness and other mental disorders

Purpose To examine the impact of substance use and other risk factors on conviction rates in people with a psychotic illness (PI) and other mental disorders (OMD) compared to those with no mental illness (NMI). Methods This research is part of a longitudinal record-linked whole-population study of 4...

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Bibliographic Details
Published in:Social Psychiatry and Psychiatric Epidemiology 2020-04, Vol.55 (4), p.517-525
Main Authors: Valuri, Giulietta M., Morgan, Frank, Jablensky, Assen, Ambrosi, Taryn L., Morgan, Vera A.
Format: Article
Language:English
Subjects:
Demographics
Drug use
Epidemiology
Medical research
Medicine
Medicine & Public Health
Medicine, Experimental
Mental disorders
Mentally ill
Original Paper
Psychiatry
Psychosis
Risk analysis
Risk factors
Substance abuse
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Summary:Purpose To examine the impact of substance use and other risk factors on conviction rates in people with a psychotic illness (PI) and other mental disorders (OMD) compared to those with no mental illness (NMI). Methods This research is part of a longitudinal record-linked whole-population study of 467,945 children born in Western Australia (WA) between 1980 and 2001. This cohort was identified through linkages between the WA psychiatric case register, WA corrective services data and other state-wide registers. We assessed 184,147 individuals born during 1983–1991 to explore the impact of exposure to a variety of risk factors on conviction rates. Results People with PI and OMD had higher conviction rates than those with NMI, with unadjusted incidence rate ratios (IRR) of 3.98 (95% CI 3.67–4.32) for PI and 3.18 (95% CI 3.03–3.34) for OMD. Adjusting for substance use reduced the rates by 60% in PI and 30% in OMD: IRRs 1.59 (95% CI 1.45–1.74) and 2.24 (2.12–2.37), respectively. Minimal change was seen when adjusting for other potential risk factors (including socio-demographics, victimisation and parental offending), with adjusted IRRs 1.58 (95% CI 1.43–1.74) for PI and 1.90 (95% CI 1.80–2.02) for OMD. Conclusions Our analysis shows people with a mental illness have higher rates of conviction than those with NMI. Substance use has a major impact on this rate. Results suggest the need for a greater investment in programs addressing the issue of comorbid substance use with a view to reduce the rate of convictions in this population.
ISSN:0933-7954
1433-9285
DOI:10.1007/s00127-019-01751-5