because it's generating discussion, [url=http://ftp.iza.org/dp1882.pdf]I went and found us a paper about athletes in regular professions[/url]. They do between 1.5-9% better, on average. The model used tries to reduce the impact of competitive, motivated people choosing to play sports, and make it more of a random-selection, 'if any single person just randomly got thrown into a sports program, would they do better' type of equation.