Diagnoses of ADHD rise in older children

Some experts are calling the CDC finding surprising because most childhood diagnoses of ADHD occur by age 11.

Some experts say the increase may reflect that doctors are increasingly considering the possibility of ADHD in older children who have concentration problems.

It's a trend critics say coincides with the marketing of ADHD medications to teens and adults. ADHD is characterized by impulsiveness, hyperactivity and inability to focus attention.

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