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Related to Childhood disintegrative disorder: pervasive developmental disorder, Rett's Disorder
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Conditions classified as an ASD were: the classical autistic disorder, Asperger disorder, childhood disintegrative disorder, Rett disorder and a pervasive developmental disorder, not otherwise specified.
By definition, childhood disintegrative disorder can only be diagnosed if the symptoms are preceded by at least 2 years of normal development and the onset of decline is prior to age 10.
These three conditions, along with Rett's syndrome and childhood disintegrative disorder, make up the broad diagnostic category of pervasive developmental disorders.

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