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Odds ratios for possible risk factors for detecting Salmonella Cubana on farms in the outbreak in pig farms in Sweden 2003. |
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| Odds ratio (90% confidence interval) |
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| Farm positive in feed and/or faeces (n = 49) |
Farm positive in faeces (n = 31) |
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| Type of production: |
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| Integrated vs piglet |
3.14 (1.09 – 9.02) |
1.78 (0.61 – 5.15) |
| Fattening vs piglet |
3.38 (1.11 – 10.28) |
1.25 (0.41 – 3.83) |
| Herd size: |
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| No. of pigs (OR per extra 100 pigs) |
1.05 (1.00 – 1.10) |
1.03 (1.00 – 1.06) |
| No. of stable units: |
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| 1–5 stable units vs ≥ 11 |
0.21 (0.05 – 0.85) |
0.26 (0.08 – 0.83) |
| 6–10 stable units vs ≥ 11 |
0.28 (0.06 – 1.29) |
0.39 (0.11 – 1.42) |
| Herd size (divided on type of production): |
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| Piglet producing |
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| big vs small (<500 pigs) |
17.50 (1.88 – 163.22) |
9.33 (1.08 – 81.0) |
| Fattening |
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| big vs small (<950 pigs) |
0.33 (0.07 – 1.57) |
0.30 (0.08 – 1.21) |
| Integrated |
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| big vs small (<1250 pigs) |
1.56 (0.46 – 5.34) |
1.76 (0.54 – 5.74) |
| Type of feed: |
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| soy vs other types |
18.32 (3.20 – 104.90) |
1.62 (0.68 – 3.85) |
| Feeding system: |
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| dry vs wet (H2O) |
0.92 (0.34 – 2.51) |
0.60 (0.21 – 1.69) |
| wet (whey) vs wet (H2O) |
2.50 (0.94 – 6.62) |
0.93 (0.37 – 2.33) |
| wet (whey) vs dry |
2.73 (1.02 – 7.29) |
1.56 (0.60 – 4.07) |
| Feed delivery week: |
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| (farms with only one delivery, n = 46) |
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| 18 vs 23 |
0.08 (0.01 – 1.22) |
N.a. |
| 19 vs 23 |
0.50 (0.06 – 4.03) |
0.06 (0.01 – 0.45) |
| 20 vs 23 |
0.21 (0.03 – 1.69) |
0.08 (0.01 – 0.70) |
| 21 vs 23 |
0.28 (0.03 – 2.37) |
0.06 (0.01 – 0.52) |
| 22 vs 23 |
0.22 (0.03 – 1.96) |
0.13 (0.01 – 1.10) |
| No. of feed deliveries: |
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| one vs three or more |
1.13 (0.31 – 4.15) |
0.35 (0.10 – 1.29) |
| two vs three or more |
0.80 (0.20 – 3.25) |
0.45 (0.11 – 1.83) |
| Amount of feed: (OR per extra ton) |
1.04 (1.00 – 1.08) |
1.02 (0.99 – 1.04) |
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Reference variables (baseline) in italics. Odds ratios with p < 0.10 in bold. N.a. = not applicable, due to too few observations in one group. | ||
Österberg et al. Acta Veterinaria Scandinavica 2006 47:13 doi:10.1186/1751-0147-47-13 |
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