Why are USA and Brazil higher than China and Europe? Is something different about Western Hemisphere? Indian curses or something.
I suspect that China underreports the prevalence ("My uncle Xi who lives in a remote village became a bit strange as he got old, but it's OK, there is no need to take him to a doctor in the city..."), but I have no idea why Europe is different from US/Brazil. I think it would be easy to google up more data if you want to explore this further.
Another month, another rationality quotes thread. The rules are: