Table 1.
Variable | Category | No. | Positive % | Univariate | Multivariate | ||||
---|---|---|---|---|---|---|---|---|---|
ORa | -95 % CI |
+95% CI | ORa | -95 % CI |
+95% CI | ||||
Region | East | 65 | 39 | Ref | |||||
Northwest | 72 | 51 | 1.7 | 0.9 | 3.3 | 2.6 | 1.2 | 5.8 | |
Southwest | 153 | 59 | 2.3 | 1.3 | 4.1 | 3.8 | 1.9 | 7.9 | |
Herd size | Small | 83 | 30 | Ref | |||||
Medium | 87 | 60 | 3.5 | 2.7 | 7.2 | 3.8 | 1.9 | 7.5 | |
Large | 116 | 63 | 3.4 | 1.8 | 6.5 | 5.4 | 2.7 | 11 | |
Production type | Farrow-to-finish | 65 | 31 | Ref | |||||
Wean-to-finish | 38 | 63 | 3.9 | 1.7 | 9.0 | 4.0 | 1.6 | 10 | |
Grow-to-finish | 185 | 58 | 3.1 | 1.7 | 5.6 | 2.0 | 1.0 | 4.0 | |
Purchase of pigs | No purchase | 73 | 36 | Ref | |||||
Purchase from 1-2 sources | 165 | 55 | 2.2 | 1.3 | 3.9 | ||||
Purchase from multiple sources | 49 | 71 | 4.5 | 2.1 | 9.9 | ||||
Animal flow system | Continuous | 90 | 40 | Ref | |||||
AI/AOb with cleanup | 22 | 46 | 1.3 | 0.5 | 3.2 | ||||
AI/AObwith cleanup and disinfection | 154 | 59 | 2.2 | 1.3 | 3.4 | ||||
Flooring | Concrete with bedding | 25 | 16 | Ref | |||||
Partially slatted | 41 | 44 | 7.1 | 2.4 | 21 | ||||
Totally slatted | 219 | 58 | 4.1 | 1.2 | 14 | ||||
Cattle in the farm | Present | 235 | 56 | Ref | |||||
Absent | 55 | 36 | 0.5 | 0.2 | 0.8 | ||||
Use of antimicrobialsc | No | 126 | 42 | Ref | |||||
Yes | 164 | 60 | 2.1 | 1.3 | 3.4 |
Categories with the lowest MRSA prevalence were chosen as references (indicated as Ref).
a p-value < 0.05
b All in/all out
c Reported treatments at group level