In high school sports, girls more likely to experience concussion

In high school sports played by both girls and boys, girls are about 50 percent more likely to get a concussion.
That's according to a study by the University of North Carolina at Chapel Hill.
The reasons may have to do with physical or equipment differences and that girls may be more likely to report concussions. 
Among girls, the biggest cause of concussion was contact with equipment.
Also, past research on girls' soccer suggested the bigger ratio between the size of the ball and girls' necks, compared to boys' necks, might explain their greater likelihood of concussion when heading a soccer ball.