At Least 100 Concussions Left Out of N.F.L. Studies

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After the Eagles’ Jimmie Jones, left, and William Thomas, right, sacked Cowboys quarterback Troy Aikman in 1997, he was unable to continue in the game.

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Tom Mihalek/Agence France-Presse — Getty Images

From 1996 to 2001, the N.F.L. gathered data in an effort to study the dangers of concussions. Whenever a concussion was diagnosed, the team physician was to record information like the player’s position, his symptoms and how much time he spent recovering.

As is common in such studies, players’ names and teams were represented only by codes, and the information is believed to have never been seen by more than a few committee members. There were 887 concussions recorded…

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