• 1.6 to 3.8 million sustain sports- and recreation-related mild TBI occur annually, but as many as 50% of concussions may go unreported.
  • Concussions account for approximately 5–10% of all injuries sustained.
  • Previously concussed athletes are four to six times more likely to experience a second concussion, even if the second blow is relatively mild.
  • Repeated concussions occurring within a short period of time (i.e., hours, days, or weeks) can be catastrophic or fatal.