In supplementary analyses, we also tested whether child sex moderated results shown in Table 1. That is, we modified Equation 16 to include the effect of Sex in a fashion analogous to that for Equation 19. Relative to females, males had a slightly lower estimated cross-over point, Ĉs = −0.12 (SE = 0.24), and a somewhat lower level of social skills at the cross-over point, Â0s = −1.17 (SE = 1.84). Also, males were slightly less affected than females by child care in both the low-malleability, B̂1s = −2.37 (SE = 5.77), and high-malleability groups, B̂1s = −13.27 (SE = 11.10). But, none of these effects was statistically significant, as t-values ranged between |0.41| and |1.20| (all ps > .20). Although accepting the null hypothesis can be a risky gambit, the present data provide no evidence that results differed significantly by child sex.
