Table 3 Univariable analysis results of potential risk factors associated with sero-positivity of sheep population against Brucella spp.
Determinants | Total no. of sheep | Brucella positive | Brucella negative | Odds ratio (OR) | 95% CI | P value |
|---|---|---|---|---|---|---|
Animal Origin | ||||||
 Purchased | 12 | 3 | 9 | 2.19 | (0.85, 2.21) | 0.32 |
 Homebred | 68 | 9 | 59 | Ref |  |  |
Age (median = 1.5 years) | ||||||
  > 1.5 | 37 | 9 | 28 | 4.29 | (1.16, 20.63) | 0.041* |
  ≤ 1.5 | 43 | 3 | 40 | Ref |  |  |
Herd size (median = 100) | ||||||
  > 100 | 24 | 7 | 17 | 4.2 | (1.19,15.91) | 0.026* |
  ≤ 100 | 56 | 5 | 51 | Ref |  |  |
Parity (median = 1) | ||||||
  > 1 | 24 | 6 | 18 | 4.11 | (0.98,21.29) | 0.055 |
  ≤ 1 | 40 | 3 | 37 | Ref |  |  |
Gender | Â | Â | Â | Â | Â | Â |
 Male | 16 | 3 | 13 | 1.41 | (0.28,5.53) | 0.646 |
 Female | 64 | 9 | 55 | Ref |  |  |
Grazing | ||||||
 Yes | 74 | 12 | 62 | 2.6 | (0.12, 49.16) | 0.154 |
 No | 6 | 0 | 6 | Ref |  |  |
Repeat breeding | ||||||
 Yes | 11 | 3 | 8 | 2.94 | (0.62,2.63) | 0.199 |
 No | 53 | 6 | 47 | Ref |  |  |