marginally non-significantP = 0.066
In fact, a linear model disclosed a significant effect of the sex by pheomelanin concentration interaction on θ values (F 1,41 = 4.15, P = 0.048) and a marginally non-significant effect on φ values (F 1,41 = 3.58, P = 0.066), suggesting that the relationship between throat coloration and pheomelanin concentration differed between the sexes.