BMC Veterinary Research

Table 4 Repeated measures multi-level model of 10,039 cattle from 102 unvaccinated herds with PP BHV-1 levels as the continuous outcome and seropositive yes/no as the discrete outcome (Dataset B, see methods section).

From: A four year longitudinal sero-epidemiological study of bovine herpesvirus type-1 (BHV-1) in adult cattle in 107 unvaccinated herds in south west England

					Continuous			Discrete outcome
Variable	Category level	No. herds	No. cattle	No. obs	Coef	SE^b	P value	Coef	SE^b	P value
Intercept					-0.05	0.08		2.95	0.42
Triplet code^a	Reactive	35	3839	7286
	Proactive	31	4900	8660	-0.17	0.09	0.05	-0.43	0.46	0.35
	Survey	36	3665	7776	-0.10	0.09	0.28	-0.19	0.48	0.69
Restocked	No	82	10235	19398
	Yes	24	2278	4433	0.23	0.07	<0.01	1.10	0.36	<0.01
Farm location	Area A	33	2736	4975
	Area B	62	8644	16438	-0.01	0.09	0.91	-0.53	0.47	0.26
	Area C	11	1133	2418	-0.01	0.13	0.94	-0.51	0.72	0.48
Age (years)	2	91	1901	1969
	3	101	3996	4401	0.08	0.01	<0.01	0.16	0.07	0.02
	4	102	3877	4325	0.24	0.01	<0.01	0.72	0.07	<0.01
	5	100	3239	3634	0.35	0.01	<0.01	1.11	0.07	<0.01
	6	101	2652	2870	0.41	0.01	<0.01	1.36	0.08	<0.01
	7	96	2011	2181	0.48	0.01	<0.01	1.51	0.08	<0.01
	8	96	1520	1658	0.53	0.02	<0.01	1.59	0.10	<0.01
	9	94	1001	1118	0.59	0.03	<0.01	1.67	0.16	<0.01
	>10	88	641	1675	0.50	0.08	<0.01	0.52	0.70	0.46
Herd size	3–68	22	644	1246
	70–137	22	1488	2944	-0.02	0.09	0.88	-0.05	0.50	0.92
	141–199	20	2118	4232	0.05	0.09	0.59	0.88	0.49	0.07
	200–274	19	2921	5969	0.25	0.10	<0.01	1.53	0.52	<0.01
	284–847	19	5233	9331	0.40	0.10	<0.01	2.21	0.53	<0.01
Herd had	No	53	3049	6362
dairy cattle	Yes	53	9482	17469	0.18	0.06	<0.01	1.02	0.33	<0.01
Herd had	No	79	10092	19019
grower cattle	Yes	27	2439	4812	-0.12	0.07	<0.01	-0.29	0.35	0.41
Cattle birthplace	Homebred	83	5654	11059
	Purchased	82	3894	7545	-0.06	0.01	0.07	-0.01	0.06	0.87
Season	Winter	55	4008	6862
	Spring	52	4715	8166	-0.07	0.01	<0.01	-0.25	0.06	<0.01
	Summer	26	2342	3331	-0.02	0.01	0.05	-0.09	0.08	0.326
	Autumn	31	2829	4095	0.10	0.01	<0.01	0.59	0.07	<0.01

^aSee Table 1 for variable definition
^bStandard Error
The random effects of the repeated measures multi-level model (Variance and SE) Herd: 0.07 and 0.01; Cattle: 0.14 and 0.003; Visit: 0.08 and 0.001.

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ISSN: 1746-6148

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