Here's the problem - the study was on brains from people that thought they had CTE. This is called self selection bias.
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HOWEVER, in the study, they acknowledge this, and also state they have 1400 additional brains to test, that were not self selected.
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Or put another way: 99% of a pool that were already concerned/saw warning signs.
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the CNN headline is much better- "CTE found in 99% of studied brains from deceased NFL players"
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The rest of those brains are from people who played football. It's not a different group, they just did the self selectors first.
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