In December 2007 an article appeared in the Journal of Athletic Training that detailed the incidence of concussion in various youth sports. The chart provides these statistics.
Prevalence of concussion in high school sports
Based upon data presented on the Illinois High School Association website, there are just over 200,000 high school athletes in Illinois participating in the above listed sports. At this level of participation and looking at all of these sports together, concussion is estimated to occur 45 times during each contest or practice session statewide. As would be expected, football is plagued with the highest incidence of concussion and over 200 concussions are suspected among Illinois high school players each year. Perhaps less understood, female soccer and basketball carry relatively high incidence rates, and it is estimated that there are over 100 concussions in female soccer and basketball in Illinois each season.