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

Table 2 The final multivariable logistic regression model (with risk factors selected using AIC) with case/control classifications based on liver condemnations as the response variable (131 case and 63 control farms)

Variable	Level	Estimate	SE	P-value	OR	95% CI
Intercept		-2.400	0.675
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	-0.368	0.961		0.69	0.09–4.33
	Dry & No	0.218	0.734		1.24	0.29–5.30
	Wet & Yes	2.060	0.568		7.84	2.67–25.1
	Wet & No	1.316	0.580		3.73	1.12–12.0
Herd size (per 100 animals)		0.396	0.001	< 0.001	1.49	1.20–1.90
Grazing of dry cows (Not grazed, Dry grazing or Wet grazing)				0.047
	Not grazed	Ref			Ref
	Dry	0.274	0.433		1.31	0.56–3.09
	Wet	1.443	0.637		4.23	1.31–16.7
Breed				0.102
	DH	Ref			Ref
	Cross	1.265	0.851		3.54	0.80–25.8
	Other	-0.548	0.472		0.58	0.23–1.47
Beef production				0.113
	No	Ref			Ref
	Yes	1.007	0.685		2.74	0.80–12.8

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

ISSN: 1756-3305