Time loss due to shoulder injury by sport and sex, National High School Sports–Related Injury Surveillance Study, United States, 2005–2006 and 2006–2007 school years. Data are based on weighted national estimates and include competition and practice exposures. a Includes season-ending and career-ending injuries. b Includes injuries with which the athlete continued playing and for which the athlete had surgery after the season or injuries with which the athlete continued playing, but with modified activities to accommodate the injury. c Caution should be used when interpreting national estimates for girls' soccer, because they are based on small case counts and have a relative standard error greater than 30%.