Table 4 Final model for characteristics of piglets associated with time to swine influenza virus shedding.
Variables and categories | Hazard ratio | Confidence interval (95%) | P value |
|---|---|---|---|
Mean HI titre (log2) of the dam | < 0.001 | ||
7 days after farrowing | |||
Low (≤ 5.9) | 2.4 | 1.8 – 3.3 | |
Moderate (]5.9-6.9]) | 1.6 | 1.2 – 2.3 | |
High (> 6.9) | - | - | |
Number of cross-fostered piglets in the litter | < 0.001 | ||
None | - | - | |
Between 1 and 4 | 0.98 | 0.77 – 1.3 | |
More than 4 | 3.7 | 2.5 – 5.4 | |
Number of stillborn or mummified piglets | 0.01 | ||
0 or 1 | - | - | |
2 or more | 1.4 | 1.1 – 1.7 |