Comparing the Test-Retest Reliability of Impact Relative to a New Concussion Assessment Battery (SportGait): Significant Differences and Order Effects Emerged.

Participants completed two concussion assessment batteries twice in counterbalanced order with 7-13 days in between each assessment to calculate test-retest reliability. Findings indicate that ImPACT is marked by significant problems with the stability of scores even within two weeks, and more established measures appear to provide a better alternative.