I don't know how you would even approach that due to the huge selection bias. Any kind of relevant metric, such as future injury of health, academic success in

I don't know how you would even approach that due to the huge selection bias. Any kind of relevant metric, such as future injury of health, academic success in a non-sports-scolarship program, future propensity to crime etc etc. are strongly influenced if you simply are the kind of person that is likely to enroll into sports.