Table 4.

Models that rendered a p-value ≤ 0.1 (“ref” reference, “OR” odds ratio, “LL” and “UL” lower limit and upper limit of 95% confidence interval).

Response variable	Explanatory variable	Variable level	OR	LL	UL	z-value	p-value
Individual serostatus (animal level)	Age	Intercept	0.006	0.001	0.031	−6.000	< 0.001
		Age in years	1.130	0.985	1.295	1.745	0.081
	Feeding of concentrated feed	Intercept	0.045	0.010	0.202	−4.065	< 0.001
		No (ref)
		Yes	0.242	0.055	1.057	−1.886	0.059
	Rodent problem	Intercept	0.012	0.003	0.049	−6.032	< 0.001
		No (ref)
		Yes	3.765	1.029	13.773	2.003	0.045
Farm Serostatus (farm level)	Restocking	Intercept	0.429	0.152	1.068	−1.736	0.083
		Rearing of replacement heifers + Buying-in
		Rearing of replacement heifers	0.254	0.064	0.960	−2.023	0.043
		Buying-in	1.167	0.268	4.977	0.210	0.834
	Feeding of concentrated feed	Intercept	0.583	0.217	1.450	−1.133	0.257
		No (ref)
		Yes	0.262	0.081	0.855	−2.254	0.024
	Rodent problem	Intercept	0.151	0.066	0.299	−4.985	< 0.001
		No (ref)
		Yes	2.944	0.956	9.165	1.896	0.058
	Other animals species	Intercept	0.556	0.171	1.608	−1.054	0.292
		No (ref)
		Yes	0.319	0.091	1.199	−1.765	0.078