The rise of attention deficit hyperactivity disorder (ADHD) supports the idea that rates of diagnosis can depend on all sorts of things that may have little to do with what is going on inside a child’s head. Nearly one in six boys in America under the age of ten has been diagnosed with ADHD, and a majority of these children take medication for it. Though in its current incarnation it is an American invention, it has since spread throughout the developed world, where around one child in 20 is now diagnosed with the condition.
- Youthful folly, Economist, July 9, 2015

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