Teenage athletes with attention-deficit/hyperactivity disorder (ADHD) are more likely than their peers to report concussion-like symptoms during preseason baseline tests, a new study suggests. "This may lead us to refine the ways we use baseline concussion tests. Right now it's a one-size-fits-all test," said study investigator Donna Huang, MD, a resident at the Spaulding Rehabilitation Network in Boston, Massachusetts.