Thus, "ADHD is not just a school-day disorder; it is an all-day disorder," Harold Koplewicz, M.D., a child psychiatrist and director of the New York University Child Study Center, said in a statement released with the study results. "In addition to its proven impact on academic performance, ADHD also affects how children get along with family and friends, complete homework assignments, and participate in after-school activities. Successful management of this condition needs to address all aspects of a young person’s daily life."