" Barkley’s comment that ADD is more impairing than any syndrome in all mental health that is treated on an outpatient basis. More impairing than anxiety, more impairing than depression, more impairing than substance abuse. The “morbidity” of untreated ADD is profound. "

― Edward M. Hallowell , Driven to Distraction: Recognizing and Coping with Attention Deficit Disorder from Childhood Through Adulthood