NUMBER CRUNCHING Head Count The U.S. Centers for Disease Control estimates between 1.6 to 3.8 million concussions occur every year. Concussion management is now a hot topic among sports enthusiasts and health practitioners. 7 to 10 number of recovery days for most concussions 2001 The year the first International Consensus Conference on Concussion in Sport was established 5 to 10 percentage of athletes who will experience a concussion in any given sport season 10 to 15 percentage of concussions that generally develop into persistent post-concussive symptoms