Here's the problem - the study was on brains from people that thought they had CTE. This is called self selection bias.
referencing were football players who have died since the study started. So we know 110 for sure out of 1400ish.
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Ideally, they'd be able to test those brains as well to get the actual numbers. I suspect it's around 15-20%
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Point still remains that it's the same population though (football players who have died), so it's fair to compare.
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