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J Autism Dev Disord. 2007 Aug;37(7):1361-74. Epub 2006 Dec 5.

Follow-up of children diagnosed with pervasive developmental disorders: stability and change during the preschool years.

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Division of Autism and Communication Disorders, State Diagnostic and Counseling Center, Digranesvegur 5, 200, Kópavogur, Iceland.


Forty-one children with pervasive developmental disorders (PDDs) receiving eclectic services were assessed twice during their preschool years. Measures were compared over time for the whole group and for diagnostic subgroups: Childhood autism (CA group) and Other PDDs group. The mean intelligence quotient/developmental quotient (IQ/DQ) of the whole group was stable (P = 0.209) and scores on the Childhood Autism Rating Scale (CARS) decreased (P = 0.001). At time 2, the CA group was more impaired than the other PDDs group: autistic symptoms were more severe (P = 0.01), adaptive behavior scores were lower (P = 0.014), and a trend for lower IQ/DQs (P = 0.06). Children in this study seemed to fare better than reported in previous follow-up studies on children with autism.

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