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Table 1
Seropositivity percentage and univariate analysis results across individual level variables.
| Variable | Level | N | Positive | Percentage | 95% CI | OR (95% CI) | p value |
|---|---|---|---|---|---|---|---|
| Type | Heifers | 33 | 1 | 3.03% | (0.00–8.14%) | Ref. | |
| Cows | 851 | 21 | 2.47% | (1.53–3.42%) | 0.81 (0.16–14.7) | 0.8 | |
| Missing | 17 | 0 | |||||
| Pregnant | No | 527 | 16 | 3.04% | (1.90–4.53%) | Ref. | |
| Yes | 352 | 6 | 1.70% | (0.57–2.86%) | 0.55 (0.2–1.36) | 0.2 | |
| Missing | 22 | 0 | |||||
| Cow status | Dry | 78 | 1 | 1.28% | (0.00–3.45%) | Ref. | |
| Milking | 773 | 20 | 2.59% | (1.68–3.71%) | 2.05 (0.42–37.0) | 0.5 | |
| Missing | 50 | 1 | |||||
| Parity | 1 | 306 | 8 | 2.61% | (1.31–4.43%) | Ref. | |
| 2 | 194 | 4 | 2.06% | (0.52–3.82%) | 0.78 (0.21–2.53) | 0.7 | |
| 3 | 137 | 4 | 2.92% | (0.73–5.40%) | 1.12 (0.29–0.34) | 0.9 | |
| ≥4 | 169 | 5 | 2.96% | (1.18–5.52%) | 1.14 (0.34–3.46) | 0.8 | |
| Missing | 95 | 1 | |||||
| Stay on farm | Stay | 650 | 19 | 2.92% | (1.85–4.20%) | Ref. | 0.3 |
| No | 91 | 1 | 1.10% | (0.00–2.95%) | 0.37 (0.02–1.81) | ||
| Missing | 160 | 2 | |||||
| Abortion history | No | 828 | 21 | 2.54% | (1.57–3.51%) | Ref. | |
| Yes | 73 | 1 | 1.37% | (0.00–3.68%) | 0.53 (0.03–2.61) | 0.5 | |
| Repeat breeder history | No | 339 | 9 | 2.65% | (1.18–4.17%) | Ref | |
| Yes | 198 | 3 | 1.52% | (0.51–3.26%) | 0.56 (0.12–1.92) | 0.4 | |
| Missing | 364 | 10 |
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