title: IQ in children with autism spectrum disorders: data from the Special Needs and Autism Project (SNAP).
abstract: BACKGROUND
  Autism spectrum disorder (ASD) was once considered to be highly associated with intellectual disability and to show a characteristic IQ profile, with strengths in performance over verbal abilities and a distinctive pattern of 'peaks' and 'troughs' at the subtest level. However, there are few data from epidemiological studies.
  
  
  METHODS
  Comprehensive clinical assessments were conducted with 156 children aged 10-14 years [mean (s.d.)=11.7 (0.9)], seen as part of an epidemiological study (81 childhood autism, 75 other ASD). A sample weighting procedure enabled us to estimate characteristics of the total ASD population.
  
  
  RESULTS
  Of the 75 children with ASD, 55% had an intellectual disability (IQ<70) but only 16% had moderate to severe intellectual disability (IQ<50); 28% had average intelligence (115>IQ>85) but only 3% were of above average intelligence (IQ>115). There was some evidence for a clinically significant Performance/Verbal IQ (PIQ/VIQ) discrepancy but discrepant verbal versus performance skills were not associated with a particular pattern of symptoms, as has been reported previously. There was mixed evidence of a characteristic subtest profile: whereas some previously reported patterns were supported (e.g. poor Comprehension), others were not (e.g. no 'peak' in Block Design). Adaptive skills were significantly lower than IQ and were associated with severity of early social impairment and also IQ.
  
  
  CONCLUSIONS
  In this epidemiological sample, ASD was less strongly associated with intellectual disability than traditionally held and there was only limited evidence of a distinctive IQ profile. Adaptive outcome was significantly impaired even for those children of average intelligence.
authors.affiliation: Centre for Research in Autism and Education, Department of Psychology and Human Development, Institute of Education, London, UK. t.charman@ioe.ac.uk
authors.forename: T
authors.initials: T
authors.lastname: Charman
authors.forename: A
authors.initials: A
authors.lastname: Pickles
authors.forename: E
authors.initials: E
authors.lastname: Simonoff
authors.forename: S
authors.initials: S
authors.lastname: Chandler
authors.forename: T
authors.initials: T
authors.lastname: Loucas
authors.forename: G
authors.initials: G
authors.lastname: Baird
mesh_terms: D000223:Adaptation, Psychological; D000293:Adolescent; D001321:Autistic Disorder / Q000523:psychology; D002648:Child; D002659:Child Development Disorders, Pervasive / Q000523:psychology*; D005260:Female; D006801:Humans; D008607:Intellectual Disability / Q000175:diagnosis / Q000523:psychology; D007360:Intelligence; D007361:Intelligence Tests; D008297:Male; D006113:United Kingdom; D014888:Wechsler Scales