The study, conducted by University of Michigan Institute of Social Research covered 1,063 retired players in 2008. It should be taken seriously, especially by those running programs in high schools and colleges where kids often play through injuries and pay a permanent cost for it.
The Times article concludes:
"The league insisted that it was doing so only because the disease “affects many elderly people” well beyond N.F.L. players. And a pamphlet that the league gives every player about concussion risks states, 'Research is currently under way to determine if there are any long-term effects of concussion in N.F.L. athletes.'
'It's time to edit that brochure,' said Kevin Mawae of the Tennessee Titans, the president of the N.F.L. Players Association. 'Now it's in their words and not just other people's.'"