A new study out of Boston University estimates that nearly 75% of former NFL players who died between 2008 and 2023 had chronic traumatic encephalopathy, or CTE, CBS News reported.

Marina Dunbar reported for The Guardian that the study was published on Wednesday in JAMA Network Open and was conducted by a Boston-based team. The outlet described CTE as a brain disease. The research examined the estimated prevalence of CTE among 2,362 players who died during the 2008 to 2023 period, a span of 15 years, and estimated that about 75% of them had evidence of the disease.

The two reports differ somewhat in wording and detail. CBS News described the figure as nearly 75%, while The Guardian described it as about 75%. The CBS News summary does not give the number of players studied, while The Guardian reports that the research covered 2,362 players.

Both outlets attribute the estimate to the new study. Both reports also describe the estimate as applying to former NFL players who died during the 2008 to 2023 period. Neither report reviewed for this story gives further detail on how the estimate was calculated, so that information is not reported here.

Readers seeking the full findings may consult the original reports, which contain more information than the summaries reviewed for this story.

Sources: CBS News: Nearly 75% of ex-NFL players who died from 2008-2023 had CTE, study finds; The Guardian: New study estimates 75% of deceased ex-NFL players had brain disease CTE.