Statistical Results.

UG responders' minimum acceptable offers are regressed on DRD4 exon3 (2/2 & 2/4 genotype  = 0, 4/4 genotype  = 1), SoB (winter born  = 0; non-winter born  = 1), and gender (male  = 0, female  = 1), and their interaction terms. The first model contains only DRD4; the second model contains DRD4, SoB and gender; the third model contains DRD4, SoB and gender as well as their interaction terms. The number is the estimated regression coefficients and the one in the bracket is the robust standard errors. The individual coefficient is statistically significant either at the ***0.1% level, at the **1% level, or at the *5% level, using two-sided t-tests.