Author Response: Association of Position Played and Career Duration and Chronic Traumatic Encephalopathy at Autopsy in Elite Football and Hockey Players

We have no difference of opinion with Mez et al. regarding the statistical power issues, and their description of the relevant limitations is an accurate recapitulation of our own.1 We did not intend to suggest, with a cohort of this size, that there could not be some small differences in chronic traumatic encephalopathy (CTE) risk based on position; of course, smaller differences might be found with larger sample sizes. Whether differences <50% would have practical relevance for elite collision sport athletes is an open question. With respect to career duration measurement, we also analyzed career duration at the highest level played, but this analysis was removed from the article in response to reviewers' reasonable suggestions that the information was redundant to the age of retirement data. However, a summary line remains in table 1.1

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