Brief Report: Autistic Behaviors among Children with Fragile X or Rett Syndrome: Implications for the Classification of Pervasive Developmental Disorder.

A study of 14 males with fragile X syndrome, 12 females with Rett Syndrome, and 25 individuals with other developmental disorders found that among those with fragile X syndrome, none of the 11 who did not have a diagnosis of autism met the Diagnostic and Statistical Manual of Mental Disorders (DSM) criteria for pervasive developmental disorder. (CR)