- Qualified participants are those who have received a formal diagnosis of autism from a physician or psychologist using DSM-IV, DSM-IV-TR or ICD-9-CM diagnostic criteria. Parents and/or legal guardian must supply proof of autism diagnosis. Autism (DSM-IV, DSM-IV-R or ICD-9-CM 299.0) must be diagnosed - any other diagnosis such as Pervasive Developmental Disorder (PDD), Pervasive Developmental Disorder Not Otherwise Specified (PDD-NOS) or Asperger Syndrome is not sufficient for inclusion in this study.