RT Book, Section A1 Fennell, Eileen B. A2 Carney, Paul R. A2 Geyer, James D. SR Print(0) ID 6650830 T1 Chapter 9. Attention-Deficit/Hyperactivity Disorder T2 Pediatric Practice: Neurology YR 2010 FD 2010 PB The McGraw-Hill Companies PP New York, NY SN 978-0-07-148925-6 LK neurology.mhmedical.com/content.aspx?aid=6650830 RD 2024/03/28 AB Attention-deficit/hyperactivity disorder (ADHD) is one of the most frequently encountered disorders in pediatric and adolescent medical practice. ADHD is a complex developmental disorder of brain and behavior that makes its initial appearance in preschool ages, persists into adolescence, and, in some individuals, into adult life.1 In 2007, the CDC summary of health statistics for U.S. children indicated that 4.5 million children (7%) between the ages of 3 and 17 years had been diagnosed with ADHD. The rate for boys (11%) was twice the rate for girls (4%).2 While the degree of persistence of this disorder into adulthood is still unclear, estimates from longitudinal studies suggest between 1% and 6% of the adult population has symptoms of ADHD.3