Table 3.
Prevalences (%) and univariable analysis of the potential risk factors for seropositivity to Brucella antibodies in indigenous cattle (following adjustment for sampling weight)
| Variable | Level | No. of Sample | Prevalence (95% CI) |
OR (95% CI) | P-value* |
|---|---|---|---|---|---|
| Age groups | 1 - 2 years | 497 | 1.0 (0.1, 1.8) | 1.0 (-) | |
| 3-4 years | 366 | 3.0 (1.0, 5.0) | 3.1 (1.0, 9.3) | 0.046 | |
| > 4 years | 760 | 5.1 (3.4, 7.0) | 5.4 (2.1, 14.1) | 0.001 | |
| Sex | Male | 485 | 2.2 (0.7, 3.3) | 1.0 (-) | |
| Female | 1138 | 4.1 (2.8, 5.4) | 2.1 (1.0, 4.3) | 0.040 | |
| Herd size | < 15 animals | 414 | 0.5 (0.2, 1.2) | 1.0 (-) | |
| 15 - 29 animals | 758 | 3.9 (2.1, 5.6) | 8.1 (1.9, 34.7) | 0.005 | |
| ≥ 30 animals | 451 | 4.3 (2.5, 6.1) | 9.1 (2.2, 38.3) | 0.003 | |
| Agro-climate | Low altitude | 435 | 4.4 (1.8, 7.0) | 1.0 (-) | |
| Mid altitude | 1008 | 3.3 (2.2, 4.4) | 0.7 (0.4, 1.5) | 0.391 | |
| High altitude | 180 | 1.0 (0.3, 2.4) | 0.2 (0.1, 9.5) | 0.043 | |
| Production system | Mixed farming | 900 | 1.8 (0.8, 2.8) | 1.0 (-) | |
| Pastoral system | 723 | 4.5 (2.9, 6.1) | 2.6 (1.3, 5.1) | 0.007 | |
| Species composition | Cattle-small rum | 1080 | 2.4 (1.1, 3.6) | 1.0 (-) | |
| Cattle-small rum-camel | 271 | 4.7 (2.9, 6.5) | 2.0 (1.0, 4.0) | 0.041 | |
| Camel-cattle-small rum | 272 | 5.8 (2.2, 9.5) | 2.6 (1.1, 6.1) | 0.032 |
* Variables with p ≤ 0.25 identified as possible risk factors and offered to multivariable model, rum: ruminant