Data from a new CDC report, which was analyzed by “The New York Times,”shows 11% of all school-age children have received an attention deficit hyperactivity disorder diagnosis at some point in their lives – a 16% increase since 2007.

Nearly one in five boys in high school has been diagnosed with ADHD, and nearly two-thirds of children with a current diagnosis of ADHD are taking medication for it, like Ritalin or Adderall.

In this segment with Wolf Blitzer, Dr. Sanjay Gupta explains that the self-reported survey may not accurately indicate the number of children with ADHD.

The crux of the issue is that medical records weren’t used and no patients were directly examined. The method was to call parents and ask them questions about their children, which can be an unreliable way to gather scientific data.