Important research on sex differences in sport between girls and boys.
I know there's current research on dementia in female and male football and rugby players, as a result of head impacts and injuries, with women having more risk for this.
Research was done in the US interestingly and makes a stronge case for sex differences to be taken note of, and focus on impact rather than collisions.
Girls were less likely to be taken off pitch.
Teen girl footballers have double concussion risk of boys www.bbc.co.uk/news/health-56894240