title: The Gordon Diagnostic System and WISC-III Freedom from Distractibility Index: validity in identifying clinic-referred children with and without ADHD.
abstract: Gordon Diagnostic System and WISC-III scores for clinic-referred 6- to 16-yr.-olds (184 with ADHD Combined Type and 46 without ADHD) were analyzed to evaluate the combination of scores and cutpoints that maximized diagnostic accuracy. Using an "ADHD cutpoint" of IQ minus the GDS Composite score > or = 13, 87.8% of the children were correctly identified as having or not having ADHD. IQ minus Freedom from Distractibility > 0 yielded 73.5% accuracy. When the two meaures were combined to create new criteria (IQ minus GDS Composite > or = 13 or IQ minus Freedom from Distractibility > or = 11), diagnostic accuracy increased to 90.9% and negative predictive power improved substantially. Diagnostic agreement between the Gordon Diagnostic System and Freedom from Distractibility was 70%, suggesting that the two tests measure both similar and unique traits.
authors.affiliation: Department of Psychiatry, The Pennsylvania State University College of Medicine, USA. SueDMayes@aol.com
authors.forename: Susan Dickerson
authors.initials: SD
authors.lastname: Mayes
authors.forename: Susan L
authors.initials: SL
authors.lastname: Calhoun
mesh_terms: D000293:Adolescent; D000554:Ambulatory Care Facilities; D001289:Attention Deficit Disorder with Hyperactivity / Q000175:diagnosis*; D002648:Child; D005260:Female; D006801:Humans; D008297:Male; D012017:Referral and Consultation; D015203:Reproducibility of Results; D014888:Wechsler Scales