Risk factor | Value | Odds-ratio (95Â % CI) | P-value |
---|---|---|---|
Age class | <1 month – suckling piglets | 1 |  |
1–2 months – weaned piglets | 1.9 (1.0–3.2) | 0.04 | |
2–3 months – young fattening pigs | 2.0 (1.3–3.2) | 0.002 | |
>3 months – fattening pigs | ns | 0.29 | |
Herd size (number of sows on a logarithmic scale) | Increase from the 25 % (139 sows) to the 75 % percentile (251 sows) of the observed distribution | 0.87 (0.8–0.9) | 0.04 |
Presence of dairy cattle | No | 1 | Â |
Yes | ns | 0.24 | |
Presence of a Danish entry facility | No | 1 | Â |
Yes | 0.58 (0.3–0.9) | 0.04 | |
Use of specialised clothes inside production units | No | 1 | Â |
Yes | ns | 0.77 | |
Feed distribution method | Automatic feeder | 1 | Â |
Manual distribution | ns | 0.38 |