This means that even if all those other brains test negative for CTE (which is highly unlikely), a football player's risk for CTE is 9%...
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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Compare away, but 9% isn't statistically valid (& concl that 5% is "stat sig diff" is unsupported) if 111 aren't part of a random sample
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The entire sample is 1400. 110 so far have shown signs. Even if no other brains showed signs, that's still 9%
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