[misev]

The study was only done on members of American Mensa, I wonder if there would be any difference across countries.

I'm from a poor European country; in high school (~15 years ago) I measured 156 in a Mensa IQ test, a friend had 168, and a third friend 172. We were top students in the generation, going to programming and math competitions. Definitely not in the popular kids club, but otherwise perfectly normal as far as I can tell. In the couple of Mensa meetings I've been to back then I have not really seen any of the mental or physical disorders considered in the study either.