What exactly is the ADI-R? According to the Autism Genetic Research Exchange website (AGRE):
- The interview contains 93 items and focuses on behaviors in three content areas or domains: quality of social interaction (e.g., emotional sharing, offering and seeking comfort, social smiling and responding to other children); communication and language (e.g., stereotyped utterances, pronoun reversal, social usage of language); and repetitive, restricted and stereotyped interests and behavior (e.g., unusual preoccupations, hand and finger mannerisms, unusual sensory interests). The measure also includes other items relevant for treatment planning, such as self-injury and over-activity.
- A classification of autism is given when scores in all three content areas of communication, social interaction, and patterns of behavior meet or exceed the specified cutoffs, and onset of the disorder is evident by 36 months of age. ... The total cutoff score for the communication and language domain is 8 for verbal subjects and 7 for nonverbal subjects. For all subjects, the cutoff for the social interaction domain is 10, and the cutoff for restricted and repetitive behaviors is 3.
S. Ozonoff, S., B. L. Goodlin-Jones, et al. "Evidence-based assessment of autism spectrum disorders in children and adolescents." Journal of Clinical Child and Adolescent Psychology 34(3): 523-540, 2005.
Anne Le Couteur, Catherine Lord, Michael Rutter. Autism Diagnostic Interview-Revised (ADI-R), Western Psychological Services, 2003