The prevalence of attention-deficit/hyperactivity disorder (ADHD) among children in the United States has doubled since the 1970s.1 Possible reasons include changes in diagnostic criteria and epidemiological methods, shifts in national policy regarding disability and special education, marketing of ADHD medications by the pharmaceutical industry, and secular trends such as the effect of electronic media.
Brosco JP, Bona A. Changes in Academic Demands and Attention-Deficit/Hyperactivity Disorder in Young Children. JAMA Pediatr. 2016;170(4):396-397. doi:10.1001/jamapediatrics.2015.4132