Table 4.
Results of multivariable Cox regression analysis revealing risk factors significantly associated with mortality of layer chickens.
| Variable | Category | HR | P value | 95% CI |
|---|---|---|---|---|
| Farm experience | ≥3 yrs. | 0.007 | 0.000 | 0.003, 0.012 |
| <3 yrs. | ||||
| Breed | Bovans brown | 0.279 | 0.000 | 0.161, 0.483 |
| Sasso | ||||
| Availability of veterinary services | In adequate | 21.667 | 0.000 | 5.635, 83.306 |
| Adequate | ||||
| Regular vaccination | Yes | 0.016 | 0.000 | 0.004, 0 .085 |
| No | ||||
| Farm ownership type | Private | 2.508 | 0.002 | 1.403, 4.482 |
| Government | ||||
| Housing system | deep litter | 4.102 | 0.000 | 2.300, 7.315 |
| cage system | ||||
| Age category | 4–5 month | 0.269 | 0.010 | 0.099, 0.732 |
| >5 month |