Study’s Alarming Finding: At Least 1 in 4 N.F.L. Players Gets Brain Disease

The actual prevalence, researchers said, may be much higher. By John Branch, The New York Times Since the degenerative brain disease known as C.T.E. was first scientifically linked to football about 20 years ago, and as hundreds of former professional football players have been diagnosed with the disease after their deaths, a haunting question has lingered: Just how many N.F.L. players will end up with C.T.E.? New data provides a sobering indication: At least one in four of all the people wh