Clinical validity and interpretation of the Gordon Diagnostic System in ADHD assessments

Susan Mayes, Susan Calhoun, Errin W. Crowell

Research output: Contribution to journalArticlepeer-review

44 Scopus citations


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.

Original languageEnglish (US)
Pages (from-to)32-41
Number of pages10
JournalChild Neuropsychology
Issue number1
StatePublished - 2001

All Science Journal Classification (ASJC) codes

  • Neuropsychology and Physiological Psychology
  • Developmental and Educational Psychology
  • Pediatrics, Perinatology, and Child Health


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