The Boston University CTE Center study of 77 dead male ice hockey players showed that the risk for the brain disease jumped by 34% with each year played.

The largest study ever of 77 deceased male ice hockey players by the Boston University CTE Center found that the odds of having chronic traumatic encephalopathy (CTE) increased by 34% each year played,

Eighteen of the 19 NHL players whose brains were studied after death were discovered to have chronic traumatic encephalopathy.