HealthDay News — One in 10 children and teens have been diagnosed with attention-deficit/hyperactivity disorder, and that number has remained constant since 2007, according to government estimates.

To estimate how many children, aged 4 to 17 years, have received a diagnosis of attention-deficit/hyperactivity disorder (ADHD), Patricia N. Pastor, PhD, of the CDC’s National Center for Health Statistics, and colleagues combined results from the 2011, 2012, and 2013 National Health Interview Surveys.

Among all age groups combined, 9.5% of children and teens had ever been diagnosed with ADHD. Only 3% of children, aged 4 to 5 years, had been diagnosed with ADHD, the researchers found, but that number jumped to 9.5% for children aged 6 to 11 years. Among teens aged 12 to 17 years, the researchers found 12% had ever been diagnosed with ADHD.

White children, aged 6 to 11 and 12 to 17, were the most likely to have an ADHD diagnosis. Hispanic children and teens were the least likely to have been diagnosed with ADHD, according to the report.

Children with public insurance were also more likely to have an ADHD diagnosis compared with children with private insurance. In addition, children from lower-income households were more likely to have a diagnosis, compared with those in wealthier households. The number of children diagnosed was lowest among those without health insurance.