title: Structural Validity of the WISC-IV for Students With ADHD.
abstract: OBJECTIVE
  To evaluate the structural validity of the Wechsler Intelligence Scale for Children-Fourth Edition (WISC-IV).
  
  
  METHODS
  Confirmatory factor analyses were applied to a sample of 233 students diagnosed with ADHD by school multidisciplinary evaluation teams to evaluate the relative fit of the following competing models: (a) one factor, (b) two oblique verbal and nonverbal factors, (c) three oblique verbal, perceptual, and combined working memory/processing speed factors, (d) four oblique verbal, perceptual, working memory, and processing speed factors, (e) a higher-order model with four first-order factors, and (f) a bifactor model with four domain-specific factors.
  
  
  RESULTS
  A higher-order four-factor model fit the data best, which was composed of a general intelligence factor and four domain-specific factors that matched the four factors specified in the WISC-IV technical and interpretive manual. Moreover, the general intelligence factor explained more than two times the total variance contributed by all four domain-specific factors combined.
  
  
  CONCLUSIONS
  Results substantiate previous research on the WISC-IV, indicating that the general intelligence factor contributes the most reliable information. Consequently, it is recommended that interpretation of the WISC-IV remain at the Full-Scale IQ score level.
authors.affiliation: 1 University of Texas at San Antonio, TX, USA.
authors.forename: Kara M
authors.initials: KM
authors.lastname: Styck
authors.affiliation: 2 Baylor University, Waco, TX, USA.
authors.forename: Marley W
authors.initials: MW
authors.lastname: Watkins
mesh_terms: D000293:Adolescent; D001289:Attention Deficit Disorder with Hyperactivity / Q000175:diagnosis* / Q000523:psychology; D002648:Child; D005163:Factor Analysis, Statistical; D005260:Female; D006801:Humans; D007360:Intelligence / Q000502:physiology; D008297:Male; D008570:Memory, Short-Term / Q000502:physiology; D011594:Psychometrics; D012574:Schools; D015206:Southwestern United States; D013334:Students / Q000523:psychology; D014888:Wechsler Scales / Q000592:standards*
keywords: ADHD; WISC-IV; factor analysis; intelligence; validity