Table 2.

Multivariable model of the risk of BoHV1 animal-level test positivity in relation to animal- and herd-level factors.

	Obs. OR	Obs. P-value	Bootstrap	Bootstrap	Normal-based bootstrap		Bias corrected bootstrap
			SE	P-value	Lower 95%CI	Upper 95%CI	Lower 95%CI	Upper 95%CI
Last herd size (quartiles)
1	Ref.
2	1.722	0.001	0.336	0.005	1.175	2.525	1.265	1.907
3	2.239	< 0.001	0.458	< 0.001	1.500	3.343	1.794	2.280
4	4.719	< 0.001	1.029	< 0.001	3.078	7.234	–	–
No. moves
0	Ref.
1	2.005	< 0.001	0.383	< 0.001	1.380	2.915	1.267	2.365
2	2.632	< 0.001	0.572	< 0.001	1.718	4.030	1.642	3.164
≥ 3	3.494	< 0.001	0.884	< 0.001	2.128	5.736	2.143	4.463
Sex
Female	Ref.
Male	1.231	0.032	0.179	0.154	0.925	1.637	0.975	1.287
Year
2018	Ref.
2020	0.634	< 0.001	0.099	0.003	0.467	0.861	0.518	0.939
BVDV status
Neg.	Ref.
Pos.	1.602	0.048	0.487	0.121	0.883	2.906	0.881	2.875
Constant	0.038	< 0.001	0.011	< 0.001	0.021	0.067
Herd level var.	1.754		0.098		1.572	1.958
ICC (rho)	0.483		0.028		0.429	0.538