The range of pervasive developmental disorders may be subsumed under the autistic disorder category for DSM-5 because distinctions:

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The range of pervasive developmental disorders includes autistic disorder, Asperger syndrome, and pervasive developmental disorder-not otherwise specified (PDD-NOS). The diagnostic criteria for these disorders have varied over time and across different research and clinical settings. These distinctions are often associated with differences in symptom severity, language level, and intelligence, but they are not consistent or reliable enough to justify separate diagnostic categories. Therefore, DSM-5 subsumed these disorders under the category of autism spectrum disorder (ASD).

The Range of Pervasive Developmental Disorders May Be Subsumed Under