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Table 2 Multivariable logistic regression analysis of subclinical mastitis and bacteriology with various risk factors

From: Prevalence of bovine subclinical mastitis and isolation of its major causes in Bishoftu Town, Ethiopia

Risk factors Number of cows examined CMT Bacteriology
Number of positive Crude odds ratio (95% CI) Adjusted odd ratio (95% CI) Number of positive Crude odds ratio (95% CI) Adjusted odd ratio (95% CI)
Body condition score
 Poor 7 3 1 1 3 1 1
 Medium 198 77 0.86 (0.18–3.97) 0.74 (0.13–4.03) 74 0.79 (0.17–3.65) 0.70 (0.13–3.77)
 Good 57 25 0.96 (0.19–4.73) 0.73 (0.12–4.37) 24 0.96 (0.19–4.73) 0.72 (0.12–4.26)
Milk yield (litres)
 ≥ 15 106 39 1 1 36 1 1
 < 15 156 66 1.25 (0.75–2.09) 2.06 (0.95–4.44) 65 1.38 (0.83–2.31) 2.32 (1.05–5.08)a
Age (years)
 [2–6) 163 51 1 1 49 1 1
 [6–9) 81 41 2.25 (1.30–3.89)a 1.63 (0.76–3.53) 39 2.16 (1.24–3.74)a 1.48 (0.67–3.23)
 ≥ 9 18 13 5.70 (1.93–16.86)a 1.86 (0.39–8.73) 13 6.04 (2.04–17.8)a 1.79 (0.37–8.46)
Parity
 1–3 204 68 1 1 65 1 1
 4–6 53 32 3.04 (1.63–5.68)a 2.34 (0.91–5.97) 31 3.01 (1.61–5.60) 2.39 (0.93–6.18)
 ≥ 7 5 5 5
  1. aSignificant associations