Table 3.
Hazard ratios (HR) from univariate analysis of risk factors affecting the restriction period for pig farms infected with Salmonella Cubana. Only significant variables (p < 0.10) included. (HR>1 = shorter restriction period, HR<1 = longer restriction period).
| HR | P-value | |
| No. of pos. samples | 0.3 | 0.00 |
| ≰3 pos. samples at one occasion | 3.9 | 0.00 |
| Empty stable unit | 0.5 | 0.07 |
| Uncomplicated C & D*; feed systems | 1.8 | 0.08 |
| Uncomplicated C & D*; stables | 3.7 | 0.07 |
| Hygiene level: high | 3.8 | 0.07 |
| Farmers' motivation: middle | 3.9 | 0.04 |
| Farmers' motivation: high | 2.6 | 0.07 |
| External factors | 0.52 | 0.06 |
* C & D = cleaning and disinfection