I'd be very curious to see the data and the points of origin of the data on this one... I think it's pretty generally recognized that the US medical community is much quicker to diagnose mental "disorders" or the like than those of many countries. Is this a difference in actual incidence or a difference of diagnostic criteria?
I recall some discussions of ADD/ADHD in an International School setting... among the Western parents these are common household terms; among the Japanese, Taiwanese, and Korean parents there was mystification: they had never even heard of them. Is this a genetic difference or a difference between the emphasis different cultures place on training in self-control and discipline in the home? It wouldn't surprise me to discover that many who are diagnosed as hyperactive in the US might in another culture simply be considered a bit difficult.
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