5 Takeaways on the Fallout From an Alarming C.T.E. Study

The study found that at least one in four deceased N.F.L. players had chronic traumatic encephalopathy, a degenerative brain condition linked to repeated head impacts. The research examined brain tissue from former players and identified the disease at higher rates than previously documented in the general population. The study did not specify what policy or safety changes, if any, the N.F.L. plans to implement in response.

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