• Zachary Y Kerr, Jason P Mihalik, Kevin M Guskiewicz, Wayne D Rosamond, Kelly R Evenson, and Stephen W Marshall.
• Department of Epidemiology, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina, USA Injury Prevention Research Center, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina, USA Matthew A. Gfeller Sport-Related Traumatic Brain Injury Research Center, Department of Exercise and Sport Science, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina, USA Center for the Study of Retired Athletes, Department of Exercise and Sport Science, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina, USA zkerr@datalyscenter.org.
• Am J Sports Med. 2015 Mar 1;43(3):606-13.

BackgroundAthlete-recalled and clinically documented concussion histories have been used in research on former athletes, but both have limitations. Comparisons of these 2 types of concussion histories are needed to improve the accuracy of estimates of concussion history for future research and clinical care.PurposeTo estimate the agreement between athlete-recalled and clinically documented concussion histories during college and to explore reasons for differences.StudyCohort study (diagnosis); Level of evidence, 3.MethodsAthlete-recalled concussion histories were provided by a convenience sample of 130 former collegiate athletes using an online questionnaire, and they were individually linked to previously collected clinical data that tracked medically diagnosed concussions at the host institution from 1996 to 2012. The intraclass correlation coefficient (ICC2,1) was used to assess agreement between athlete-recalled and clinically documented concussion histories. Descriptive analyses were performed to assess reasons for disagreement.ResultsAgreement between athlete-recalled and clinically documented concussion histories was low (ICC2,1 = 0.21; 95% confidence interval, 0.05-0.37), but it was higher for women (ICC2,1 = 0.65; 95% confidence interval, 0.44-0.79) and for athletes playing more recently (2005-2012; ICC2,1 = 0.39; 95% confidence interval, 0.01-0.67). Of the 53 athletes who self-reported college sports-related concussions, 40% believed that they sustained impacts that should have been diagnosed as concussions but were undetected, and 21% admitted nondisclosure of suspected concussions. Common reasons for nondisclosure included the following: did not think injury was serious enough (91%), did not know it was a concussion (73%), and did not want to leave the game/practice (73%).ConclusionGiven the low agreement between athlete-recalled and clinically documented concussion histories, methodologic research is needed to improve the quality of tools used to assess concussion histories in former athletes.© 2015 The Author(s).

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