ABSTRACT
Attention deficit hyperactivity disorder (ADHD) is estimated to affect literally millions of
children throughout the world (i.e., between 3% and 5% of the childhood population, or
approximately one child in every classroom). It accounts for an estimated 30% to 60% of
clinical caseloads in child psychiatry and mental health outpatient clinics in the United
States. Currently, there is no known cure. As a result, ADHD is considered one of the
most serious and perplexing clinical disorders of childhood.
