People with psychotic illness are over-represented among those who commit violent offences resulting in significant injury, confirming the presence of an association between psychosis and severe non-lethal violence. Earlier treatment of first episode psychosis, improving the adherence to treatment of known patients and treatment of co-morbid substance abuse could reduce the incidence of severe violence committed by patients with psychosis.

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Objective: The prevalence of mental illness among those in prison is much higher than in the community; however, very few studies have examined whether rates have changed over time, in line with increasing self-reported rates in the community. Methods: This study compares the prevalence of self-reported mental illness, self-harm and suicidal thoughts/behaviours, and drug and alcohol use across three waves (2001, 2009 and 2015) of health surveys involving men and women in New South Wales prisons and compared these rates with published community-level findings. Results: The prevalence of those reporting any mental health diagnosis increased significantly across the three surveys, even after adjustment for socio-demographic and criminal justice variables that also changed over time. Individuals surveyed in 2015 were more likely to report a mental health diagnosis than those surveyed in 2001 (adjusted odds ratio = 2.66, 95% confidence interval = [2.16, 3.27]). The prevalence of self-harm and suicidal thoughts and behaviours remained stable across the three surveys, while self-reported regular drug use decreased over the period. Women experienced a far greater burden of mental illness than men across all three surveys and experienced more growth in the prevalence of most psychiatric disorders. Conclusion: These findings have important implications for public and prison health systems given the poor social, health and criminal justice outcomes of those imprisoned with mental illness, both in custody and post-release.

The likelihood of returning to custody of sentenced violent offenders with psychotic illness or cognitive disorder is higher than that of released forensic patients in New South Wales followed up for a similar period. The results suggest an opportunity to improve the outcome of offenders with psychosis by better treatment and rehabilitation.