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    Immaturity Mistaken for ADHD?

    Youngest Kids in Class More Likely to Get ADHD Diagnosis; Some Researchers Fear Misdiagnosis

    Is It Really ADHD? Another Look

    In a similar study, Melinda Morrill, PhD, a research assistant professor of economics at North Carolina State University in Raleigh, and her colleagues looked at data from two national health surveys and a national private health insurance claims database to evaluate ADHD diagnosis and treatment in children. The time period studied was from 1996 to 2006.

    "The basic idea is, we compared children born just a few days apart," she tells WebMD, including older kids who made the kindergarten cutoff and younger kids who did not. "We found very different rates of diagnosis and treatment."

    ''Children born before the cutoff have a 25% higher rate of ADHD diagnosis than children born after the cutoff for kindergarten eligibility," she says. "That's huge."

    In her national sample, she says, the average diagnosis rate of ADHD is 8%. Children born before the cutoff had a rate of 9.7%, she says, and children born after (the older kids in a class) had a rate of 7.6%.

    She can't say why, as that's beyond the study's scope. "All we show is that we have this pattern," she says.

    She agrees with Elder: ''Immaturity could be mistaken for ADHD."

    Is It Really ADHD? Second Opinions

    James Perrin, MD, a spokesman for the American Academy of Pediatrics and head of the division of general pediatrics at Massachusetts General Hospital for Children, Boston, is skeptical that a million children may be misdiagnosed.

    ''It's not an easy diagnosis to make," he says of ADHD. "There is subjectivity."

    Parents should get two opinions, he says. "We do recommend there be an independent verification," says Perrin, who has consulted for pharmaceutical companies that make medications for ADHD.

    If the diagnosis is ADHD, environmental changes as well as medication are recommended, Perrin says, not medication alone. "It may be the child is in the wrong environment."

    Another expert, George Kapalka, PhD, of Monmouth University in Long Branch, N.J., who has researched ADHD, doesn't dispute there are misdiagnoses. "We should strive to diminish those," he tells WebMD.

    But, he adds, criteria for diagnosing ADHD ''clearly indicate impairment must be present in at least two settings, so the diagnosis should never be made based on school problems alone."

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