In this Nov. 9, 2013, file photo, former Pittsburgh and NFL Hall of Fame running back Tony Dorsett stands on the sideline before the start of an NCAA football game between Pittsburgh and Notre Dame in Pittsburgh. Dorsett is one of more than 4,500 former players that have filed suit, some accusing the NFL football league of fraud for its handling of concussions. (AP Photo/Keith Srakocic, File)PHILADELPHIA (AP) — The NFL believes that nearly three in 10 former players will develop debilitating brain conditions, and that they will be stricken earlier and twice as often as the general population.The disclosure Friday comes in data the league prepared for its proposed $765 million settlement of thousands of concussion lawsuits.Both the league and players’ lawyers estimate that 28 percent of the retirees will develop Alzheimer’s disease, moderate dementia or more serious neurological problems.That would represent nearly 6,000 of the 19,000 living former players. Dozens of them could develop Lou Gehrig’s or Parkinson’s disease.A federal judge in Philadelphia has granted preliminary approval of a settlement plan that offers awards reaching $5 million. However, most men would get far less.The retirees must decide next month whether to participate.