3x is the total number of youth participants in soccer vs total youth participants in tackle football. I didn't see that your study was high school and college

3x is the total number of youth participants in soccer vs total youth participants in tackle football. I didn't see that your study was high school and college only. It seems that girls suffer much higher rates of concussions in all sports likely do to less developed neck muscles according to this [1]. So you'd have to compare concussion rate in football vs boys soccer to get a real comparison. [1] https://www.washingtonpost.com/news/recruiting-insider/wp/2017/03/27/girls-soccer-has-highest-concussion-rate-of-high-school-sports-study-finds/?utm_term=.91d80778cb4c https://www.washingtonpost.com/news/recruiting-insider/wp/20...