9.7% of children aged between 4 and 17 years had at some time been diagnosed with Attention-deficit/hyperactivity disorder (ADHD) in 2007, up from 7.8% in 2003, a 21.8% increase, according to data published today in the CDC's (Center for Disease Control and Prevention) Morbidity and Mortality Weekly Report (MMWR). The authors say their findings reveal the considerable impact of ADHD...