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ERIC Number: EJ992312
Record Type: Journal
Publication Date: 2012-Jun
Pages: 13
Abstractor: As Provided
Reference Count: 57
ISSN: ISSN-0022-006X
Patterns of Developmental Trajectories in Toddlers with Autism Spectrum Disorder
Lord, Catherine; Luyster, Rhiannon; Guthrie, Whitney; Pickles, Andrew
Journal of Consulting and Clinical Psychology, v80 n3 p477-489 Jun 2012
Objective: Our objective was to follow toddlers referred for risk of autism, using standardized observational measures administered frequently from age 18 months to age 36 months. Method: Sixty-five children who were consecutive referrals and 13 children from other research projects were seen approximately every 2 months, from age 18 months to age 36 months, for standardized assessments and clinical judgments by the same examiner and every 6 months by an examiner blind to previous scores. Results: Thirty children never received an autism spectrum disorder (ASD) diagnosis; 48 children (all referrals) received at least 1 diagnosis of ASD. The best trajectory typology, using Autism Diagnostic Observation Schedule (ADOS) scores, revealed 4 trajectory classes with high probabilities for fit to the most likely class: severe persistent (21%), worsening (21%), improving (19%), and nonspectrum (40%). Classes differed by trajectories in verbal and nonverbal mental ages; never-ever ASD groups differed on Autism Diagnostic Interview-Revised (ADI-R) domain scores and clinician judgments, but improving-worsening trajectory groups did not. Conclusions: The results replicated the findings from studies of infants whose siblings have autism and infants whose siblings do not have autism, suggesting variability in early trajectories and supporting the need for early identification, regular monitoring, and standardized assessments of young children suspected of having ASD. (Contains 4 tables and 5 figures.)
American Psychological Association. Journals Department, 750 First Street NE, Washington, DC 20002-4242. Tel: 800-374-2721; Tel: 202-336-5510; Fax: 202-336-5502; e-mail:; Web site:
Publication Type: Journal Articles; Reports - Research
Education Level: N/A
Audience: N/A
Language: English
Sponsor: N/A
Authoring Institution: N/A
Identifiers - Location: Michigan
Identifiers - Assessments and Surveys: Mullen Scales of Early Learning; Autism Diagnostic Observation Schedule