Figure 3. Concussion Incidence Increases as Dew Point Decreases.

(a) Bar graph shows mean dew point (SEM) for concussion and concussion-free games (p<0.01, **). (b) Bar graph shows mean concussion incidence for games played at different dew point increments. (c) Poisson regression computes the predicted concussion incidence of any given game played at a certain dew point. The environmental factors of temperature, dew point, humidity, and barometric pressure were utilized in the model.