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Table 3 The final multivariable logistic regression model (with risk factors selected using AIC) with positive/negative classification based on bulk tank ELISA results (106 positive and 88 negative farms)

From: Farm-level risk factors for Fasciola hepatica infection in Danish dairy cattle as evaluated by two diagnostic methods

Variable Level Estimate SE P-value OR 95% CI
Intercept   -1.555 0.462    
Grazing of heifers (Not grazed, Dry grazing or Wet grazing) combined with access to surface water (No or Yes)     < 0.001   
Not grazed Ref    Ref  
Dry & Yes 0.749 0.870   2.11 0.35–11.6
Dry & No -0.218 0.762   0.80 0.17–3.50
Wet & Yes 1.753 0.536   5.77 2.10–17.5
Wet & No 1.428 0.570   4.17 1.41–13.5
Grazing of dry cows (Not grazed, Dry grazing or Wet grazing     0.004   
Not grazed Ref    Ref  
Dry 0.489 0.380   1.63 0.78–3.46
Wet 1.558 0.503   4.75 1.85–13.5
Purchase of cows     0.099   
No Ref    Ref  
Yes 0.81 0.504   2.25 0.86–6.32
  1. Abbreviations: SE standard error, OR odds ratio, 95% CI 95% confidence interval, Ref reference