What does late age at onset, atypical symptomatology, or subthreshold symptomatology, or all of these mean in Pervasive Developmental Disorder Not Otherwise Specified (Including Atypical Autism)?
It's confusing, because Pervasive Developmental Disorder Not Otherwise Specified (Including Atypical Autism) is a form of Autism and Autism is a developmental disorder, It is now known as ASD Level 1.