A cluster randomised controlled trial of a manualised cognitive behavioural anger management intervention delivered by supervised lay therapists to people with intellectual disabilities

The intervention was effective at changing anger coping skills and staff-rated anger. Impact on self-rated anger was equivocal. With hindsight there are reasons, from an analysis of factors influencing outcomes, to think that self-rated PI was not a well-chosen primary outcome. Widespread implementation of manualised lay therapist-led but psychologist-supervised anger management CBT for people with mild to moderate intellectual disabilities is recommended.