No abstract

Non-concussed high school athletes scored near the total possible in most domains of the SCAT2 with the exception of concentration testing and balance testing. All athletes were able to complete the double-leg stance at baseline; however, there was significant variability of tandem and single-leg stance. Baseline testing is important when considering balance tests. Concentration testing in high school athletes is unreliable because of high baseline error and is likely to result in a high rate of false positives and false negatives. Return to play decisions should not rely on concentration testing without a baseline test for comparison.

The number of documented concussions more than doubled after the institution of the Lystedt law, which may be attributed to heightened awareness and closer monitoring.

Diagnostic study with poor reference standard, Level IV.