1 in 4 NFL players who died between 2016-2021 had CTE
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Researchers said 215 of the 235 former players who donated their brains to study from 2016-21 had CTE, which can only be diagnosed after death.
Playing football has long been linked to the brain disease known as CTE, but how prevalent it is is still unknown. A new study of former NFL players who died recently found that at least 25% had CTE.