"The NFL analyzes and shares injury data as a part of ongoing efforts to advance the health and safety of players. The injury data are compiled and analyzed by IQVIA, an independent, third-party company retained by the NFL."

Key information Noted by NFL:

• 2020 had no documented preseason games due to Covid-19.
• 2021 - 2023 had a decrease in preseason games from 4 to 3.
• 2021 - 2023 had an increase in regular season games from 16 to 17.

This data looks at the concussion injuries documented by IQVIA for NFL seasons 2015-2023.
https://www.nfl.com/playerhealthandsafety/health-and-wellness/injury-data/injury-data