This picture is from the CDC and Prevention Morbidity and Mortality Weekly Report Oct. 7, 2011, Volume 60, No. 39.
UPDATE 12:00p CST: As noted in the comment section these numbers represent ONLY emergency room/department visits; there are tons of concussions that do not go to an ER for all activities. It may be more poignant in organized team sports with an athletic trainer. Not all concussions need to be sent to an ER. I don’t send concussions to an ER unless there is deterioration or the caregivers are not comfortable with the instructions. The second point I want to make is (brought up on twitter) this is for “non-fatal traumatic brain injuries”, which is a pretty big sampling of brain injury. Here is the deal a concussion IS A BRAIN INJURY and no brain injury is a “good thing” and if this were to drill down to just “concussion” I feel the numbers would show more disparity. Reason being; in cycling there are probably much more TBI’s that rate much higher on the severity scale – especially those going to an ER.