Study: 95% of deceased NFL players had brain disease - KWWL - Eastern Iowa Breaking News, Weather, Closings

Study: 95% of deceased NFL players had brain disease

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BOSTON (KWWL) -

The brains of 87 out of 91 former professional football players tested positive for a degenerative brain disease linked to depression and dementia.

Researchers from Boston University and the Department of Veterans Affairs told the PBS show "Frontline" about the findings.

The disease is chronic traumatic encephalopathy -- or CTE. It's thought to occur after repeated blows and trauma to the head.

Overall -- the labs tested the brain tissue of 165 people who played football in either high school, college or in the NFL.

CTE was detected in 131 players. 40% were offensive or defensive linemen.

The percentage doesn't reflect all football players, because these participants donated their brains to research.

They likely suspected they had the brain disease before their death.

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