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Table 2 Risk factors associated with new brucellosis infections in cattle farms compared with farms that remained brucellosis-free for at least three years based on multiple logistic regression model

From: Risk factors for new bovine brucellosis infections in Colombian herds

Variables B (SE) OR 95% CI OR p-value
(Intercept) −0.35 (0.26) 0.71 (0.43; 1.18) 0.184
Brucellosis-free farms or internal replacement   1   
Replacement from farms with unknown/positive brucellosis status 1.58 (0.47) 4.84 (1.92; 12.20) < 0.001
Type: Dairy   1   
Type: Beef 1.28 (0.54) 3.61 (1.26; 10.35) 0.017
Type: Dual purpose (beef and milk) 0.18 (0.47) 1.20 (0.48; 2.99) 0.696
Artificial insemination   1   
Brucella-free status of the origin of the bulls −1.21 (0.42) 0.30 (0.13; 0.69) 0.004
Positive/unknown Brucella status of the origin of the bulls 0.90 (0.43) 2.45 (1.06; 5.68) 0.037
  1. B coefficient estimated by the model, SE standard error, OR odds ratio, 95% CI OR confidence interval of the OR (lower limit of the 95% CI; upper limit of the 95% CI)