Here non-O blood groups were associated with more anxiety. In office, I have noticed that types A seem more relaxed and unconcerned compared to types O and B.
While these authors treat their findings as example of how any genetic stratification that is seen on a large enough scale can yield differences in behavior (?) the ABO difference seems related to the NPA system in that type A seems less likely to have any of the A NPA types if looked at on a global scale (habitancy theory) since the nations with predominance of type A ABO group tend to be countries like Sweden, Denmark, Switzerland, Germany, Etc.
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