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,

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.

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