Lol, to be honest I also noticed this that europeans and spanish players are more likely to bluff! Also that US are most likely to be on tilt than others haha just my observation!
from what I remember the swedish and norwegians tend to be very aggressive/bluffy
this is bluff....I know Dutch people are in generally supertight like me
my personal experience is that russians are absolutely crazy in bluffing.. but I dont know if its bluffing or just donk betting and call stations they play like they absolutely dont care, and just clicking on buttons And romanians are little bit more crazy as normal I guess... so eastern countries?