For example:
https://ufhealth.org/news/2021/headgear-significantly-reduce...
Female high school lacrosse players are significantly less likely to sustain concussions and other injuries if they wear headgear, a landmark study led by University of Florida Health researchers has found.
Girls who play the sport in states that don’t require headgear had a 59% higher concussion rate than players in Florida, the only state with a headgear mandate. The researchers also found lacrosse games were more hazardous than practices: Concussions were 74% higher during competition among players in states without headgear requirements when compared with Florida players.
Those details emerged from data collected during 357,225 games and practices in Florida and other states during three seasons from 2018 to 2021. The findings were presented today at the American Academy of Pediatrics national conference