Table 2.
Farm-level Salmonella risk factors associated with being a Platinum (low-prevalence) farm identified through multivariable analysis of 57 pig farms
| Variable | Level | Platinum farms | Control farms | Odds Ratio | 95% confidence intervals | P-value |
|---|---|---|---|---|---|---|
| Feed type most commonly used | Pelleted | 2 | 27 | 1.00 | – | – |
| Meal | 8 | 7 | 19.88 | 2.19–180.85 | 0.008 | |
| Liquid | 9 | 4 | 27.11 | 3.03–242.32 | 0.003 | |
| Feed lorries ever enter the farm perimeter | Yes | 7 | 32 | 1.00 | – | – |
| No | 12 | 6 | 10.93 | 1.78–67.00 | 0.010 | |
| Antibiotics regularly added to feed/water | Yes | 5 | 26 | 1.00 | – | – |
| No | 14 | 12 | 4.84 | 0.92–25.40 | 0.062 |