A new study conducted by FAIR Health found that concussion diagnoses in children and young adults under the age of 22 rose 500 percent between the span of 2000 and 2014.

FAIR Health is a national, independent, nonprofit organization dedicated to bringing transparency to healthcare costs and health insurance information

The study also found September and October are the months with the highest incidence of concussions for individuals under age 22—months that correlate with the start of the football season.

Those in high school years show greater concussion rates than the middle school or college years, and although boys generally have more concussions than girls, the largest disparity in youth concussions between the genders occurs from ages 5 to 10.

In Pennsylvania and Connecticut, where certain girls’ sports (e.g., field hockey, ice hockey, lacrosse and soccer) are popular, girls have nearly as many or more concussions than boys.