Girls showed a sharp rise in ADHD diagnosis during eight-year study period George Washington University Milken Institute School of Public Health WASHINGTON, DC (December 8, 2015)–Twelve percent of U.S. children and teens had a diagnosis of Attention Deficit/Hyperactivity Disorder (ADHD) in 2011, a number that has jumped by 43 percent since 2003, according to a large national study based on …