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Considerable variation has been reported in the prevalence and correlates of challenging behaviour (CB) in adults with intellectual disabilities (ID). To provide a robust estimate of prevalence, we identified the entire administrative population of adults with ID in a defined geographical area and used a behaviour assessment tool with good psychometric properties.

Data from 265 adults who were known to services were collected using a demographic survey tool and the Behavior Problems Inventory – Short Form. The prevalence of selfinjurious, aggressive/destructive, stereotyped, and overall CB was evaluated. We explored the potential of developing cumulative risk indices (CRI) to inform longitudinal research and clinical practice.

The prevalence of overall CB was 18.1% (95% CI: 13.94–23.19%). The prevalence of selfinjurious behaviour was 7.5% (95% CI: 4.94–11.37 …