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[Comment] Attention deficit hyperactivity disorder and premature death

In The Lancet, Søren Dalsgaard and colleagues1 provide strong evidence that attention deficit hyperactivity disorder (ADHD) is a risk factor for premature death. Although no single study can be definitive, this one comes close. The data come from the medical registers of Denmark, where diagnoses of ADHD are conservative. The sample was large—1·92 million people, of whom 32 061 had ADHD—and the follow-up was long, with little missing data. Most importantly, the authors adjusted for potential confounders.