| http://www.w3.org/ns/prov#value | - The study by Edgeworth Economics, based on information collected by the league, also shows that players with concussions missed an average of 16 days last season, up from only four days in 2005, while the length of time out for other types of injuries has been steadier.Severe injuries are increasing in frequency, Jesse David, the economist overseeing the study, said in a telephone interview from
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