Variable name | Value | N(%) | OR | 95% CI | p-value* |
---|---|---|---|---|---|
PRRS vaccine | none | 74 (63.3) | 1.0 | Â | Â |
 | killed | 6 (5.1) | 0.5 | 0.1-5.6 | 0.55 |
 | live | 37 (31.6) | 7.5 | 2.5-22.8 | <0.01 |
Dead pigs disposal | incineration | 38 (32.5) | 1.0 | Â | Â |
 | collection | 79 (67.5) | 5.6 | 1.7-18.3 | <0.01 |
Pig density (in 10 km radius) | <15000 | 80 (68.4) | 1.0 | Â | Â |
 | ≥15000 | 37 (31.6) | 2.9 | 1.0-8.3 | 0.04 |
Age at weaning in days | 21-27 | 57 (48.7) | 1.0 | Â | Â |
 | ≥28 | 60 (51.3) | 0.2 | 0.1-0.7 | <0.01 |