Test of the variation in embryonic developmental times and hatching measurements.

Results of the Generalized Estimating Equation (GEE) model procedures on embryonic developmental time to pipping (hours from the start of incubation to the first crack in the egg shell), pipping duration (hours from the first crack in the egg shell to the fully emerged chick), total embryonic developmental time (sum of the two previous times), hatching mass (g), hatching head length (mm) and hatching flipper length (mm) according to egg treatment (control or androgen-treated egg), nest category (AA- or BB-nest), sex (male or female) and egg mass (in g). All non-significant interactions were removed from the model during the backward procedure. df is always equal to 1. Significant P-values are marked in bold.