According to a new study, about 25 percent of the nearly 900 former N.F.L. players who died between 2016 and 2021 had chronic traumatic encephalopathy.
The former N.F.L. player Jonathan Martin entering an M.R.I. machine for a brain examination that was part of a study to develop treatments for the symptoms and illnesses linked to 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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