Table 4. Multivariate GLMM analysis of potential risk factors for stillbirth of 568 piglets born from 45 Landrace × Yorkshire sows on a farm in Vietnam.
| Covariates | CI; 95% CI; P |
|---|---|
| CFD < 90 min | 1 |
| CFD = 90−240 min | 2.47; 1.25−4.89; 0.009 |
| CFD > 240 min | 3.84; 1.36−10.84; 0.011 |
| BI < 30 min | 1 |
| BI > 30 min | 3.08; 1.41−6.73; 0.005 |
| CRL = 25−29 cm | 1 |
| CRL > 29 cm | 2.19; 0.91−5.30; 0.081 |
| CRL < 25 cm | 3.48; 1.27−9.54; 0.015 |
| BW = 1.0−1.8 kg | 1 |
| BW > 1.8 kg | 2.05; 0.88−4.79; 0.096 |
| BW < 1.0 kg | 3.05; 1.25−7.45; 0.014 |
| PI < 50 | 1 |
| PI > 50 | 0.25; 0.02−0.53; <0.001 |
| GL = 114−116 days | 1 |
| GL = 117−118 days | 0.86; 0.20−3.57; 0.830 |
| GL = 112−113 days | 3.68; 1.49−9.08; 0.005 |
| LS = 5−13 | 1 |
| LS = 14−20 | 3.79; 1.46−9.82; 0.006 |
| P = 2−4 | 1 |
| P = 1 | 1.51; 0.57−3.95; 0.401 |
| P = 5−8 | 6.37; 2.30−17.63; <0.001 |
P: Parity, GL: Gestation length, LS: Litter size, CRL: Crown-rump length, BW: Birth weight, PI: Ponderal index, BI: Birth interval, CFD: Cumulative farrowing duration. CI: Confidence interval.
Marginal R2 = 43.6%; Conditional R2 = 50.1%. Hosmer–Lemeshow test had a p-value of 0.640.