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

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)

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

Abbreviations: SE standard error, OR odds ratio, 95% CI 95% confidence interval, Ref reference

ISSN: 1756-3305