Table 4.
Multivariable logistic regression model of risk factors for Brucella seropositivity in cattle at individual (n = 1623) and herd (n = 134) levels using village as the cluster variable
| Variable | level | Odds Ratio | 95% CI | P-value |
|---|---|---|---|---|
| Individual animal level | ||||
| Age | 1 - 2 years | 1.0 | - | - |
| 3-4 years | 3.1 | 1.0, 9.6 | 0.045 | |
| > 4 years | 5.2 | 2.1, 12.9 | 0.000 | |
| Herd Size | < 15 animals | 1.0 | - | - |
| 15 - 29 animals | 8.1 | 1.9, 34.2 | 0.005 | |
| ≥ 30 animals | 8.0 | 1.8, 35.0 | 0.006 | |
| Herd level | ||||
| Species composition | Cattle-small rum | 1.0 | - | - |
| Cattle-small rum-camel | 2.7 | 1.1, 6.8 | 0.039 | |
| Herd Size | < 15 animals | 1.0 | - | - |
| 15 - 29 animals | 11.3 | 2.4, 51.9 | 0.002 | |
| ≥ 30 animals | 19.6 | 3.8, 100.9 | 0.000 | |