Approximately 11% of children 4-17 years of age (6.4 million) have been diagnosed with ADHD as of 2011 and the percentage of children with an ADHD diagnosis continues to increase, from 7.8% in 2003 to 9.5% in 2007 and to 11.0% in 2011 (Centers for Disease Control and Prevention).
Interestingly enough, there are some states that have a higher rate of people diagnosed with ADHD. For instance, Louisiana, North Carolina, Alabama, and Delaware lead The States with a rate of 14 percent to 15.9 percent. The states with lower rates include much of the Southwest (From California to Texas).
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Source: cdc.gov; inquisitr.com