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In one prospective cohort study of 2905 college football players, 1 in 15 players with concussion had additional concussions in the same season, most occurring 7 to 10 days after the first concussion. With each concussion, the risk of future concussions increased. Individuals with three concussions had a three times greater risk of future concussions.
Cumulative effects associated with recurrent concussion in collegiate football players: the NCAA Concussion Study.
JAMA. 2003 Nov 19;290(19):2549-55.
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