On-Field Predictors of Neuropsychological and Symptom Deficit Following SportsRelated Concussion

Objective: Investigate the relationship between on-field markers of concussion severity and postinjury neuropsycholog-ical and symptom presentation in an athlete-specific population. Design: Case control study. Setting: Multicenter analysis of high school and college athletes. Participants: A total of 78 athletes sustaining sports-related concussion were selected from a larger sample of 139 con-cussed athletes. Assessment of Predictor Variables: On-field presence of disorientation, posttraumatic amnesia, retrograde amnesia, and loss of consciousness. Main Outcome Measures: ImPACT, a computerized neuropsychological test battery, was administered pre-season and, on average, 2 days postinjury. Good postinjury presenta