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Clinical validity and interpretation of the Gordon Diagnostic System in ADHD assessments
S Dickerson Mayes1, S L Calhoun, E W Crowell
1Department of Psychiatry, Milton S. Hershey Medical Center, The Pennsylvania State University College of Medicine, 850, Hershey 17033, USA. suedmayes@aol.com
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.