A community survey establishing the prevalence rate of autistic disorder in adults with learning disability

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Abstract
AIMS AND METHOD: Most studies into autistic disorder have concentrated on children. This study aims to establish a prevalence rate of autistic disorders in an adult population with learning disabilities. Adults accessing learning disability services were diagnosed as having an autistic disorder by a two-stage process. The first stage was screening using the Pervasive Developmental Disorder – Mental Retardation Scale and then those identified by screening were diagnosed clinically.RESULTS: An overall population rate of 7.7/10 000 for autistic disorder was obtained, which is a prevalence rate of 30% in those with learning disability. The prevalence rate was higher in intensive service settings.CLINICAL IMPLICATIONS: Specific funding and interventions need to be targeted for the treatment of autistic disorders.