Fig. 2From: Are high school girls’ lacrosse players at increased risk of concussion because they are not allowed to wear the same helmet boys’ lacrosse players are required to wear?a Boys’ Lacrosse Concussion Rates Over Time by Injury Mechanism, The National High School Sports-Related Injury Surveillance Study, 2008–09 Through 2018–19. p-value level of significance, p < 0.05. p-values for trends over time: Contact with Stick or Ball, p = 0.51; Athlete-Athlete Contact, p = 0.26; Overall p = 0.92. b Girls’ Lacrosse Concussion Rates Over Time by Injury Mechanism, The National High School Sports-Related Injury Surveillance Study, 2008–09 Through 2018–19. p-value level of significance, p < 0.05. p-values for trends over time: Contact with Stick or Ball, p = 0.09; Athlete-Athlete Contact, p = 0.26; Overall p = 0.37Back to article page