Comparison between diagnostic instruments for identifying high-functioning children with autism.

Two instruments for identifying autism in children and adolescents with intellectual abilities in the normal range were compared. Diagnostic tools consisted of the Autism Behavior Checklist (ABC) and the Autism Diagnostic Interview (ADI). The sample was composed of 18 children who were all diagnosed as having either infantile autism or infantile autism, residual state based on DSM-III criteria by a clinical team using observations, parental interviews, and interactions with the children. Only 4 of the children met diagnostic cutoffs for autism on the current ABC but all met criteria for diagnosis on the ABC using parental recall of the child's behavior at 3-5 years of age. The ADI had somewhat greater specificity in that 3 children did not meet criteria for diagnosis although 2 of these children also received ABC scores based on parental recollection that were in the borderline range.