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.
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.