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DSM- IV Diagnostic Criteria- PDD- NOS
The DSM-IV stands for the Diagnostic and Statistical Manual of Mental Disorders. It is published by the American Psychiatric Association (APA) and includes all mental health disorders that are currently recognized for both children and adults.
Diagnostic Criteria for 299.80 Pervasive Developmental Disorder Not Otherwise Specified (Including Atypical Autism) 1
This category should be used when there is a severe and pervasive impairment in the development of reciprocal social interaction associated with impairment in either verbal or nonverbal communication skills or with the presence of stereotyped behavior, interests, and activities, but the criteria are not met for a specific Pervasive Developmental Disorder, Schizophrenia, Schizotypal Personality Disorder, or Avoidant Personality Disorder. For example, this category includes "atypical autism" - presentations that do not meet the criteria for Autistic Disorder because of late age at onset, atypical symptomatology, or subthreshold symptomatology, or all of these.
1 American Psychiatric Association. (2000). Pervasive developmental disorders. In Diagnostic and statistical manual of mental disorders (Fourth edition---text revision (DSM-IV-TR). Washington, DC: American Psychiatric Association, 69-70.