Table 2.

Final mixed effects logistical regression model of BVDV seroprevalence

Independent variables	Odds Ratio	Std. Err	z	P > z	Lower 95%CI	Upper 95%CI
BVD birth herd status in year of birth (Referent: Negative)
BVD positive herd in year of birth	20.889	8.033	7.900	< 0.001	9.831	44.385
BVD last herd status in year of birth (Referent: Negative)
Herd of slaughter BVD virus positive	6.565	3.066	4.030	< 0.001	2.629	16.395
Herd type (referent: dairy)
Beef	1.504	0.567	1.080	0.280	0.718	3.149
Other	0.798	0.352	-0.510	0.609	0.337	1.892
Suckler	0.387	0.095	-3.860	< 0.001	0.239	0.626
Sex (Referent: Female)
Male	0.538	0.102	-3.270	0.001	0.370	0.780
Log(last herd size)	1.376	0.128	3.440	0.001	1.148	1.651
Sample year (linear predictor)	0.779	0.065	-2.980	0.003	0.661	0.918
Constant	0.004	0.003	-7.700	< 0.001	0.001	0.015
Random effects
county
Variance	0.217	0.137			0.063	0.750
county > herd
Variance	6.816	1.753			4.117	11.283