the chart also shows that this is % of concussions vs overall injuries in the sport. not the overall number of concussions. and the rates of that are statistically even for girls soccer vs football when you consider the study is based on a sample size and not everyone who plays the sports. in addition, i wonder how the reporting of injuries differs from boys to girls. generally, society expects boys to tolerate physical pain and injury more than girls and boys who play sports are known to try and play through pain to a dangerous degree. not to say female athletes don't play through pain but they may be more likely to tell someone when they are hurting. that has been my experience coaching both boys and girls sports. and, personally, i have chronic lifelong pain and discomfort from a youth sports injury i tried to play through and ended up aggravating to the point of irreparable damage. and, honestly while I wasn't into soccer because in my neighborhood that might be fighting words, when i did try it for a minute I was most turned off by how much it hurt to hit the ball with your head (and even worse when you missed the ball and hit someone else's head).