"Each year, between 1.6 and 3.8 million concussions occur in the United States as a result of sports or recreational activities." [That's not very precise. As I have said, I don't know, or know of, a single person from my playing days, or thereafter, who has CTE or significant brain issues now from football. Not one.]
athletes in offensive and defensive skill positions, including running backs, linebackers, defensive backs, wide receivers, and quarterbacks, experience fewer, but often higher-magnitude, impacts resulting from activities such as full-speed open-field tackling.
Among American males, football has the highest participation rate of all sports, with 3 million youth, 1.1 million high school, and nearly 80,000 college football players participating in organized competitive leagues during the 2012 season.
The relative risk of concussion among the different levels of football is unclear; some studies report a greater rate of concussions in collegiate athletes, compared to high school athletes, whereas others report the opposite.
athletes in offensive and defensive skill positions, including running backs, linebackers, defensive backs, wide receivers, and quarterbacks, experience fewer, but often higher-magnitude, impacts resulting from activities such as full-speed open-field tackling.]
[This was mostly a self-report study from a dozen years ago.]
[I agree with comments that posting on the internet and egriz is more dangerous to brains of some of trolls.]