Clinical journal of sport medicine : official journal of the Canadian Academy of Sport Medicine
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Following the Second International Conference on Concussion in Sport in 2005, a summary agreement statement was published that introduced new terminology for sport-related concussions. This new classification system is binary (ie, "simple" versus "complex" concussions). Athletes who are slow to recover (ie, >10 days) are classified as having complex concussions. The purpose of this study was to determine if high school football players, retrospectively classified as having a simple or a complex concussion, could be differentiated in the first 48 after injury on the basis of symptom reporting or neuropsychological testing. ⋯ This study provides evidence that supports and refutes the clinical usefulness of the new simple-complex concussion classification system.