Table 1.
Cox mixed model results for fetus survival (N = 184)
| Predictor | β | z | P value |
|---|---|---|---|
| Rainfall | −0.504 | ||
| Number of adult females | −1.751 | ||
| Maternal dominance rank | 0.336 | ||
| Male immigration | 0.100 | 0.23 | 0.820 |
| Male hierarchy stability | −0.853 | −1.43 | 0.150 |
| Male takeover | −0.498 | −0.64 | 0.520 |
| Intergroup encounter rate | −1.509 | −3.09 | 0.002 |
| Fetal age | −0.027 | −0.07 | 0.940 |
| Rainfall × maternal dominance rank | 1.009 | ||
| Number of adult females × maternal dominance rank | 1.055 | ||
| Number of adult females × rainfall | −0.728 | ||
| Rainfall × number of adult females × maternal dominance rank | 1.036 | 2.36 | 0.018 |
Significant effects are highlighted in boldface. β is the hazard rate coefficient; a positive value indicates an increased risk of dying with increasing value of the predictor. z and P values not shown are uninformative because the respective term is involved in a higher order interaction.