In a study of career versus replacement NFL athletes, only the long-term players died of neurological disease

Career players in the National Football League aren’t significantly more likely to die over a 30-year period than elite-level replacements who played only a few games, according to new research. Still, though people died for many reasons, seven of the deaths were from neurodegenerative diseases — and that only happened in the career players' brains.

The safety of professional football has been under scrutiny for the past few years, especially with reports about how repeated concussions to the head sustained while playing can cause neurological diseases like dementia. Past studies typically compare the death of NFL players with those of the general public, but that gives us less information about the health risks and benefits of...

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