In September 2015, researchers with the United States Department of Veterans Affairs and Boston University announced that they had identified CTE in 96 percent of National Football League players that they had examined and in 79 percent of all football players.
I september 2016, annoncerede forskere fra Department of Veterans Affairs og Boston University at de havde identificeret CTE i 96 af de NFL-spillere de havde undersøgt, og i 79 procent af alle footballspillere.