TABLE 1.
Hazard ratios and 95% confidence intervals obtained from the best performing Cox proportional hazard models testing for the effect of social context, specifically litter size (i), litter sex ratio (ii), collective litter mass (iii), day of litter emergence (iv), local female density (v), density of related (kin) breeding female (vi), local density of unrelated (nonkin) breeding females (vii), and local population density of total breeding and nonbreeding females (viii)
| Selected Models (see Appendix SB3) | Hazard Ratio | 95% Confidence Interval | p‐value a | |
|---|---|---|---|---|
| (i) | Litter size (Continuous) | 0.967 | 0.876, 1.074 | .556 |
| (ii) | Ratio (Continuous) | 0.863 | 0.692, 1.076 | .19 |
| (iii) | Mass (Continuous) | 0.999 | 0.996, 1.003 | .826 |
| (iv) | Emergence (Continuous) | 1 | 0.981, 1.020 | .996 |
| (v) | Breeders (0–1, 2+) | 1 | ||
| Breeders (Continuous) | 1.28 | 0.887, 1.848 | .187 | |
| (vi) | Kin (Continuous) | 1.125 | 0.981, 1.289 | .091 |
| (vii) | Nonkin (Continuous) | 0.998 | 0.876, 1.116 | .851 |
| (viii) | Population (Continuous) | 1.063 | 0.993, 1.138 | .079 |
The p‐value is from a test on the null hypothesis of no difference in the risk of mortality between the reference variable and a given variable; if p‐value < .05, the null hypothesis is rejected and a difference between variables is deemed statistically significant, marginally significant if <0.1
Results were evaluated on a continuous scale ranging from 99 to 615 g.