Table 3. Univariate analysis for potential risk factors being a positive farm (logistic regression with likelihood ratio test).
| Variable | Category | Farm No. | BTB+ farms | OR (95% CI) | p-value |
| Herd size | Small | 32 (40.5) | 9 (19.6) | ||
| Medium | 31 (39.2) | 21 (45.6) | 5.4 (1.82; 15.76) | 0.002 | |
| Large | 16 (20.3) | 16 (34.8) | - | - | |
| Owner education level | No school | 11 (14) | 3 (6.7) | ||
| Primary school | 9 (11.6) | 5 (11) | 3.3 (0.51; 21.58) | 0.2 | |
| Secondary school | 31 (39.8) | 20 (44.5) | 4.8 (1.06; 22.10) | 0.04 | |
| Diploma and degrees | 27 (34.6) | 17 (37.8) | 4.5 (0.97; 21.14) | 0.05 | |
| BTB knowledge | Yes | 57 (71.2) | 36 (76.6) | ||
| No | 23 (28.8) | 11 (23.4) | 0.5 (0.20; 1.42) | 0.21 | |
| Owner gender | Male | 62 (78.5) | 39 (84.8) | ||
| Female | 17 (21.5) | 7 (15.2) | 0.4 (0.13; 1.23) | 0.11 | |
| Source of cattle purchase | Dairy farms | 55 (71.4) | 31 (67.4) | ||
| Markets, unknown origin | 12 (15.6) | 8 (17.4) | 1.5 (0.41; 5.75) | 0.51 | |
| Gift | 2 (2.6) | 1 (2.2) | 0.8 (0.04; 13.02) | 0.85 | |
| Research stations | 5 (6.5) | 3 (6.5) | 1.2 (0.17; 7.51) | 0.87 | |
| Dairy farms and markets | 3 (3.9) | 3 (6.5) | - | - |