Applied behaviour analysis by a specialist team plus standard treatment for
adults with intellectual disability displaying challenging behaviour was
reported to be clinically and cost-effective after 6 months. In a 2-year
follow-up of the same trial cohort, participants receiving the specialist
intervention had significantly lower total and subdomain Aberrant Behavior
Checklist scores than those receiving usual care alone. After adjustment for
baseline covariates there was no significant difference in costs between the
trial arms.