Concussion rates in U.S. high school athletes more than doubled between 2005 and 2012, according to a new national study lead by Ohio State University Master of Public Health student Dr. Joseph Rosenthal. Dr. Rosenthal, who is also a clinical professor of physical medicine and rehabilitation at Ohio State, analyzed data from the High School Reporting Information Online (HS RIO) sports injury surveillance system. The system contains data from a representative sample of 100 U.S. high schools that have at least one certified athletic trainer on staff. This particular study used data on nine different team sports. Overall, the rate increased from .23 to .51 concussions per 1,000 athlete exposures.