Developmental trajectories in children with and without autism spectrum disorders: the first 3 years.

Mark McIntosh,'s picture
PubMed URL: 
http://www.ncbi.nlm.nih.gov/pubmed/23110514
Author: 
Faherty A
Author List: 
Landa RJ
Gross AL
Stuart EA
Faherty A
Journal: 
Child Dev
PubMed ID: 
23110514
Pagination: 
429-42
Volume: 
84
Issue: 
2
Abstract: 
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 identified by 14 months, ASD identified after 14 months, and no ASD. Despite groups' initial similar developmental level at 6 months, ASD groups exhibited atypical trajectories thereafter. Impairment from 14 to 24 months was greater in the Early-ASD than the Later-ASD group, but comparable at 36 months. Developmental plateau and regression occurred in some children with ASD, regardless of timing of ASD diagnosis. Findings indicate a preclinical phase of varying duration for ASD.
Published Date: 
March, 2013

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