Whitely and colleagues1 reported that children born in June were more likely to receive treatment for attention deficit/hyperactivity disorder (ADHD) than children born in July. It is unfortunate that they did not measure the year of school intake, and rather made the assumption that all children entered school at the recommended age. The authors concluded that “there are significant concerns about the validity of ADHD as a diagnosis,” which is a large leap not substantiated by the data presented.
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