BOSTON, June 11 (UPI) -- Children without a prior concussion took 12 days on average to recover, but those with several previous concussions took longer, U.S. researchers say.
Study author Matthew Eisenberg, a physician at Boston Children's Hospital, and colleagues said children and young adults ages 11-22 who came to a hospital emergency room with a repeat concussion -- either within a year, or multiple times over a lifetime -- took longer to recover than those with a first concussion, USA Today reported.