Use of crowdsourced images for determining 2D:4D and relationship to pro-environmental variables.

There was a marginally significant interaction between sex and 2D:4D ratio for the empathy variable, F (1, 524) = 3.78, p = 0.053, η 2 p = 0.01, such that males with higher digit ratios had lower empathy scores than males with lower digit ratios, F (1, 279) = 7.51, p = 0.007, η 2 p = 0.03, whereas females did not differ in empathy as a function of digit ratio, F (1, 244) = 0.01, p = 0.93, η 2 p < 0.001 (see Fig. 3 ).

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