According to a new study, teen drivers suffering from attention-deficit hyperactivity disorder (ADHD) are more likely to engage in risky driving behaviors, particularly after receiving their driver’s license for the first time. Researchers conducted a longitudinal study comprised of 14,936 teen drivers who received their license between January 2004 and December 2014. These drivers were patients at several Children’s Hospital of Philadelphia practices. Of the 14,936 teenagers, 12 percent of the participants suffered from ADHD since childhood.