title: WISC-IV profiles are associated with differences in symptomatology and outcome in children with ADHD.
abstract: OBJECTIVE
  The current study investigated the Wechsler Intelligence Scale for Children-Fourth Edition (WISC-IV) cluster profiles of children with ADHD to examine the association between IQ profiles and diagnostic frequency, symptomatology, and outcome in this population.
  
  
  METHODS
  Hierarchical cluster analysis was conducted on 189 children with a diagnosis of ADHD-inattentive (ADHD-I) and ADHD-combined (ADHD-C) subtypes. Clusters were then compared across symptom rating scale factor scores, behavioral rating scales, and achievement scores.
  
  
  RESULTS
  A five-cluster solution was extracted. One cluster was identified to have reduced processing speed relative to other WISC-IV indexes and significantly higher ratings of inattention and incidence of ADHD-I diagnosis. A second cluster had impairments in processing speed and working memory and was associated with impaired behavioral functioning.
  
  
  CONCLUSIONS
  Findings support a relationship between reduced processing speed and inattention and provide evidence that WISC-IV profiles may be helpful in predicting symptomatology and outcome in children with ADHD.
authors.affiliation: University of Nevada, Las Vegas, NV 89154-5030, USA. nick.thaler@gmail.com
authors.forename: Nicholas S
authors.initials: NS
authors.lastname: Thaler
authors.forename: Danielle T
authors.initials: DT
authors.lastname: Bello
authors.forename: Lewis M
authors.initials: LM
authors.lastname: Etcoff
mesh_terms: D000124:Achievement; D000293:Adolescent; D001289:Attention Deficit Disorder with Hyperactivity / Q000175:diagnosis* / Q000523:psychology; D002648:Child; D016000:Cluster Analysis; D003071:Cognition / Q000502:physiology*; D003072:Cognition Disorders / Q000175:diagnosis* / Q000523:psychology; D005260:Female; D006801:Humans; D008297:Male; D008570:Memory, Short-Term / Q000502:physiology; D009483:Neuropsychological Tests; D011594:Psychometrics; D014888:Wechsler Scales