Parasites and politics: why cross-cultural studies must control for relatedness, proximity and covariation.

These results confirm that our dataset of 50 states is representative of the published literature because we get the same correlations between cultural traits and parasite load as previously reported (with the exception of attractiveness for which the original study had only 29 states included [ 55 ]). When we take relatedness and spatial proximity into account ( figure 3 .1b), the relationship between parasite load (P1 and P2) and sociosexuality (SEX), authoritarianism (AUT), attractiveness (ATT) are either non-significant or marginally significant ( table 2 ).

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