American football is studied, while the others havr loss money and in turn less studies. The correct answer is good question but we don't really know.

Even these studies are heavily weighted to those with suspected injuries and so not a good sample.

Ice hockey may actually be higher than NFL:

> They found 96% (27 of 28) of professional players had CTE pathology (18 of 19 NHL, 9 of 9 non-NHL professionals), 46% of college, juniors and semi-professional players (13 of 28) and 10% (2 of 21) youth and high school players.

https://www.bumc.bu.edu/camed/news-events/articles/2024/larg...