Historical and clinical items of the HCR-20 as predictors of risk within an intellectual disability population

Purpose – The use of violence risk assessment measures within intellectual disabilities (ID) services is now the norm and a growing target for research. The purpose of this paper is to examine the clinical utility of the historical and clinical factors of the HCR-20 in predicting violence. Design/methodology/approach – The study took place within a national low secure service for adults with ID examining all completed admissions over a six-year period, (N=22). Clinical records covering the first three months of admission were examined along with historical reports and incident data recorded at three, six, nine and 12 months admission using the Modified Overt Aggression Scale (MOAS). Findings – Significant positive relationship between Historical score and total number of incidents was established. Patients with challenging behaviour less likely to have a previous history of violence, and more likely to be older at first violent incident than patients without challenging behaviour. Incidents involving pati...