Table 7.
Cox regression model output of the relation between the serostatus for respiratory pathogens at arrival on time to diagnosis of bovine respiratory disease in a cohort of 148 rosé veal calves originating from 3 different batches.
| Variable | Level | Calves (n) | BRD positive (%) | HR | 95% CI | P-value |
|---|---|---|---|---|---|---|
| Arrival batch | NL1 | 24 | 62.5 | Ref. | ||
| NL2 | 27 | 74.1 | 1.0 | 0.5–1.9 | 0.96 | |
| GER | 97 | 57.7 | 0.8 | 0.4–1.4 | 0.38 | |
| BRSV-serostatus | Positive | 133 | 59.4 | Ref. | ||
| Negative | 15 | 86.7 | 2.0 | 1.0–3.9 | <0.05 | |
| BCV-serostatus | Positive | 111 | 55.9 | Ref. | ||
| Negative | 37 | 81.1 | 1.7 | 1.0–2.8 | <0.05 |
HR = hazard ratio; ref. = referent category; NL = the Netherlands; GER = Germany; BRSV = bovine respiratory syncytial virus; BCV = bovine coronavirus; BRD = bovine respiratory disease.