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Landa, Rebecca J.; Gross, Alden L.; Stuart, Elizabeth A.; Faherty, Ashley – Child Development, 2013
Retrospective studies indicate 2 major classes of autism spectrum disorder (ASD) onset: early and later, after a period of relatively healthy development. This prospective, longitudinal study examined social, language, and motor trajectories in 235 children with and without a sibling with autism, ages 6-36 months. Children were grouped as: ASD…
Descriptors: Pervasive Developmental Disorders, Autism, Comparative Analysis, Longitudinal Studies