Figure 2.

Babysitting contributions of (a) daughters and (b) sons from mothers treated with cortisol during pregnancy increased with age at a faster rate than those from control (females: z = −2.89, p = 0.0039; males: z = −1.92, p = 0.055), but not untreated (none) litters (females: z = 1.88, p = 0.06; males: z = −0.03, p = 0.97, table 4). Data are relative babysitting contributions from offspring from cortisol-treated (females: n = 15 estimates; males: n = 24), control (females: n = 15; males: n = 10) and untreated litters (females: n = 49; males: n = 69). Raw data and regression lines are shown (full results in table 4).