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Evidence for latent classes of IQ in young children with autism spectrum disorder.

Authors
  • Munson, Jeffrey1
  • Dawson, Geraldine
  • Sterling, Lindsey
  • Beauchaine, Theodore
  • Zhou, Andrew
  • Elizabeth, Koehler
  • Lord, Catherine
  • Rogers, Sally
  • Sigman, Marian
  • Estes, Annette
  • Abbott, Robert
  • 1 University of Washington, Psychiatry and Behavioral Sciences, Seattle, WA 98195, USA. [email protected]
Type
Published Article
Journal
American journal of mental retardation : AJMR
Publication Date
Nov 01, 2008
Volume
113
Issue
6
Pages
439–452
Identifiers
DOI: 10.1352/2008.113:439-452
PMID: 19127655
Source
Medline
License
Unknown

Abstract

Autism is currently viewed as a spectrum condition that includes strikingly different severity levels; IQ is consistently described as one of the primary aspects of the heterogeneity in autism. To investigate the possibility of more than one distinct subtype of autism based on IQ both latent class analysis and taxometrics methods were used to classify Mullen IQs in a sample of 456 children with autism spectrum disorder. We found evidence for multiple IQbased subgroups using both methods. Groups differed in level of intellectual functioning and patterns of verbal versus nonverbal ability. Results support the notion of distinct subtypes of autism that differ in severity of intellectual ability, patterns of cognitive strengths and weaknesses, and severity of autism symptoms.

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