One in six American children now has a developmental disability – a 17% increase over the past decade, driven largely by increases in autism and attention deficit hyperactivity disorder (ADHD), according to government researchers.
While researchers saw increases in a wide range of developmental problems, including stuttering and learning disabilities, the most significant increases were seen with autism and ADHD. Autism rates nearly quadrupled over the study period, from 0.19% of children in 1997-99 to 0.74% in 2006-08. But, overall, ADHD accounted for the greatest number of developmental disability cases; rates rose by 33%, from 5.7% of children in 1997-99 to 7.6% by 2008.
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