Vue lecture

Major Study Finds at Least 1 in 4 NFL Players Gets CTE

The actual prevalence, researchers said, may be much higher.

© Zack Wittman for The New York Times

The biggest predictor of C.T.E. is the cumulative force of hits to a head over a lifetime.
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How Many N.F.L. Players Will Have C.T.E.?

New research finds that at least one in four N.F.L. players who died in a six-year period had C.T.E., a degenerative brain disease caused by repeated impacts to the head. Our reporter John Branch unpacks the data and its implications for the sport.
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