Two studies published recently suggest there could be something wrong with the way ADHD is diagnosed in young children in the US, one found that nearly 1 million kids are potentially misdiagnosed just because they are the youngest in their kindergarten year, with the youngest in class twice as likely to be on stimulant medication, while the other study confirmed that whether children were born just before or just after the kindergarten cutoff date significantly affected their chances of being diagnosed with ADHD.
Papers on both studies by US researchers are in press, to be published in the Journal of Health Economics, the first being a corrected proof that was first available online in June, and the other appeared online on 4 August.
In the first paper, Dr Todd Elder, assistant professor of economics at Michigan State University, looked at a sample of nearly 12,000 children from the Early Childhood Longitudinal Study Kindergarten Cohort, which is funded by the National Center for Education Statistics. He analysed the difference in ADHD diagnosis and medication rates between the youngest and the oldest children in a kindergarten grade.
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