title: Clinical validity and interpretation of the Gordon Diagnostic System in ADHD assessments.
abstract: Gordon Diagnostic System (GDS) data were analyzed for 165 referred children with ADHD combined type and 46 referred children without ADHD, 6-16 years of age. Results showed significant differences between children with and without ADHD on the GDS standard scores and the IQ-GDS differences scores. Using a GDS composite standard score of 13 points or more below IQ to classify children as having ADHD resulted in the highest diagnostic accuracy (86%), with positive predictive power equal to 91%, and negative predictive power 67%. Results for the GDS compared favorably with those reported for other continuous performance tests. The findings lend support to the GDS as a clinically useful component of an ADHD evaluation.
authors.affiliation: Department of Psychiatry, Milton S. Hershey Medical Center, The Pennsylvania State University College of Medicine, 850, Hershey 17033, USA. suedmayes@aol.com
authors.forename: S
authors.initials: S
authors.lastname: Dickerson Mayes
authors.forename: S L
authors.initials: SL
authors.lastname: Calhoun
authors.forename: E W
authors.initials: EW
authors.lastname: Crowell
mesh_terms: D000293:Adolescent; D001289:Attention Deficit Disorder with Hyperactivity / Q000175:diagnosis*; D016022:Case-Control Studies; D002648:Child; D003937:Diagnosis, Differential; D005260:Female; D006801:Humans; D007360:Intelligence; D007859:Learning Disabilities / Q000175:diagnosis; D008297:Male; D009483:Neuropsychological Tests / Q000592:standards*; D011237:Predictive Value of Tests; D011569:Psychiatric Status Rating Scales; D015203:Reproducibility of Results