Characteristics and re-offending rates amongst individuals found Not Guilty by reason of Mental Illness (NGMI): a comparison of men and women in a 25-year Australian cohort

Kimberlie Dean*, Sara Singh, Richard Kemp, Anina Johnson, Olav Nielssen

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)

Abstract

In a 25-year Australian cohort of men and women found Not Guilty by reason of Mental Illness (NGMI forensic patients; N = 477), we aimed to: establish the sociodemographic, clinical and forensic characteristics of the sample, comparing men and women; to establish rates of post-release reoffending, including for men and women separately; and to test associations between individual characteristics and post-release re-offending in the full sample. Post-release re-offending was considered in terms of officially-recorded charges, proven offenses, violent offenses, and any offending within the first 12 months of release. Women (13.8%) were found to differ significantly from men on a number of key characteristics but, although women had a higher rate of proven offending in the early post-release period, sex was not a predictor of post-release offending overall. Post-release re-offending rates were low (6.3% committed proven offenses in the first 12 months following release) and the only independent predictor of re-offending was a clinically-recorded diagnosis of co-morbid personality disorder (i.e. co-morbid with a primary psychosis diagnosis). The differences identified between male and female NGMI forensic patients, including the differences in re-offending in the early post-release period, have implications for the development of forensic services and interventions, in both inpatient and community settings.

Original languageEnglish
Pages (from-to)17-30
Number of pages14
JournalInternational Journal of Forensic Mental Health
Volume20
Issue number1
Early online date20 Jul 2020
DOIs
Publication statusPublished - 2021

Keywords

  • criminal responsibility
  • Forensic
  • gender
  • insanity acquittees
  • NCRMD
  • NGMI
  • NGRI
  • offending
  • violence

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