Variable | d. f. | Parameter estimate | SE | Hazard ratio | p-value |
Stillbirth vs. live calf | 1 | 0.36 | 0.07 | 1.37 | <0.001 |
Multiparous vs. primiparous | 1 | 0.70 | 0.04 | 2.00 | <0.001 |
Assisted vs. unassisted | 1 | 0.18 | 0.08 | 1.14 | <0.04 |