Herd-level seroprevalence of Fasciola hepatica and Ostertagia ostertagi infection in dairy cattle population in the central and northeastern Poland

Table 2 Multivariable linear regression model for herd-level exposure to Fasciola hepatica

Risk factor	Regression coefficient (B) and standard error (SE)	95% confidence interval (95% CI) for regression coefficient	t-statistics	p-value
Intercept	0.18 (0.02)	–	–	–
The north-eastern province	0.21 (0.02)	0.17, 0.26	9.05	< 0.001^a
Length of grazing period (months)	0.03 (0.01)	0.02, 0.04	6.35	< 0.001 ^a
Grazing grass > 50% of all roughage	0.08 (0.02)	0.04, 0.13	3.38	0.001 ^a
Hay or haylage as main roughage	0.05 (0.02)	0.01, 0.09	2.03	0.043 ^a
Grazing on pasture > 6 h	0.06 (0.03)	−0.01, 0.12	1.67	0.095
Any grazing grass in roughage	−0.03 (0.03)	−0.08, 0.03	− 0.89	0.373
Grazing on pasture	0.03 (0.07)	−0.11, 0.17	0.38	0.706

^a significant risk factor for herd-level exposure to Fasciola hepatica at a significance level of 0.05

ISSN: 1746-6148