title: Interpreting change on ImPACT following sport concussion.
abstract: The purpose of this study was to examine the psychometric characteristics of Version 2.0 of ImPACT (Immediate Postconcussion Assessment and Cognitive Testing). The focus was on the stability of the test scores and the calculation of reliable change confidence intervals for the test-retest difference scores. A sample of 56 nonconcussed adolescents and young adults completed the test battery on two occasions. Test-retest coefficients, reliable change difference scores, and confidence intervals for measurement error are provided. These reliable change parameters were applied to a second sample of 41 concussed amateur athletes who were tested preseason and within 72 hr of injury. Applying these confidence intervals allows more precise determinations of deterioration, improvement, and recovery in the initial days following concussion.
authors.affiliation: Department of Psychiatry, University of British Columbia & Riverview Hospital, Vancouver, BC, Canada. giverson@interchange.ubc.ca
authors.forename: Grant L
authors.initials: GL
authors.lastname: Iverson
authors.forename: Mark R
authors.initials: MR
authors.lastname: Lovell
authors.forename: Michael W
authors.initials: MW
authors.lastname: Collins
mesh_terms: D000293:Adolescent; D000328:Adult; D001265:Athletic Injuries / Q000503:physiopathology*; D001924:Brain Concussion / Q000503:physiopathology*; D016001:Confidence Intervals; D005260:Female; D006801:Humans; D008297:Male; D008568:Memory / Q000502:physiology; D009483:Neuropsychological Tests / Q000706:statistics & numerical data*; D011340:Problem Solving; D011446:Prospective Studies; D011594:Psychometrics; D011930:Reaction Time / Q000502:physiology; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity