BALTIMORE (AP) — The National Athletic Trainers' Association is urging trainers at all levels of youth and school sports to become more involved with creating concussion policies and implementing protocols.

The group also wants policymakers to review what they have in place now and figure out how to improve those measures.

On Thursday, during its national convention in Baltimore, the group acknowledged high school football players suffer three times as many "catastrophic head injuries" as college players and 39 percent of prep football players continue playing with concussion-like symptoms.

It also noted research has shown concussion rates among all high school athletes have increased by 200 percent in the past decade — largely because of better awareness and more reporting of head injuries.

Since 2009, all 50 states have adopted concussion laws.