According to a new government report, nearly one in ten U.S. children ages 4 to 17 has been diagnosed with attention deficit hyperactive disorder (ADHD). Compiled from a 2007 federal survey of parents, the numbers represent a 22 percent leap (about 1 million more kids diagnosed) from a 2003 survey.

“Doctors and other health-care professionals have to be ready for the 1 million more children who will need to be managed,” Centers for Disease Control and Prevention epidemiologist and lead researcher Susan Visser told news agencies.

By management, doctors often mean medication. Two-thirds of kids with a current ADHD diagnosis take a prescribed medicine to treat it. Today’s array of ADHD medications tend to be more effective than in the past; many children and teens find dramatic improvement taking them.