The Mayo Clinic says it’s performed computerized baseline concussion evaluations on about 40 percent of Arizona high school athletes, in the first year they’ve been offered.

Last year, the state set up new procedures for when high school athletes who’ve been diagnosed with concussions can return to action, and the body that oversees high school athletics in the state has started requiring all high school athletes to pass a test proving they know about the symptoms and causes of concussions before they can play.

KJZZ's Mark Brodie spoke with Dr. David Dodick about concussions among high school athletes. He’s the director of the Concussion Program at Mayo Clinic in Arizona. He’s also the chair of the American Migraine Foundation.