Table 6.
Regression terms for the relationship between piglet birth weight and the log odds of preweaning mortality (PWM) within Litter Size treatment
| Item1,2 | Coefficient3 | Adjustment4 | SE | P-value5 |
|---|---|---|---|---|
| Intercept, log odds PWM | ||||
| Decreased | −2.56 | – | 0.354 | <0.0001 |
| Adjustment for Control | – | 0.32 | 0.418 | 0.45 |
| Adjustment for Increased | – | 0.90 | 0.377 | 0.02 |
| Slope, log odds PWM per kg birth weight | ||||
| Decreased | −1.85 | – | 0.876 | 0.03 |
| Adjustment for Control | – | -0.51 | 1.134 | 0.65 |
| Adjustment for Increased | – | −0.38 | 1.035 | 0.71 |
| Model AUROC6 | 0.71 | – | – | – |
1Using centered birth weight, with a mean of 1.46 kg. The regression model included Litter Size treatment, birth weight, the interaction of birth weight with Litter Size treatment, and the random effect of block.
2Decreased = 2 piglets less than the sow functional teat number; Control = the same number of piglets as the sow functional teat number; Increased = 2 piglets more than the sow functional teat number.
3Intercept and slope for the Decreased treatment.
4Adjustment to intercept or slope for the Control or Increased treatments.
5For the Decreased treatment, P-values indicate whether the intercept or slope are different to 0. P-values for the Control and Increased treatments indicate differences in intercept or slope compared to the Decreased treatment.
6AUROC = Area under the receiver operating characteristic curve, a measure of the percentage of piglet mortality outcomes correctly predicted by the model.