Table 1.

Results of univariable and multivariable general linear regression models

			Country corrected univariable			Country corrected multivariable
Outcome variable	Risk factor	N	β-coefficient	p-value	Adjusted R2	β-coefficient	p-value
LOG TI Breeding	TI 200	227	<0.01	<0.01	0.148	<0.01	0.01
	Internal biosecurity	227	0.22	0.36	0.073
	External biosecurity	227	0.51	0.08	0.083
	Years experience	221	−0.07	0.81	0.071
	Pathogens vaccinated	227	2.35	0.14	0.079
	# sows	227	0.01	0.33	0.074
	# employees	221	0.43	0.78	0.066
	Gender	214		0.60	0.071
	Male	137	3.14	0.60
	Female	77	Ref.	Ref.
	Education	210		0.11	0.082
	Lower	84	−15.47	0.05
	Higher	84	−15.77	0.06
	University	42	Ref.	Ref.
	Farrowing rhythm (cat)	219		0.76	0.060
	>5	18	−0.81	0.95
	5	20	2.76	0.82
	4	48	−1.34	0.89
	3	80	4.33	0.62
	2	21	14.94	0.20
	1	32	Ref.	Ref.
LOG TI 200	TI Breeding	227	<0.01	<0.01	0.332	<0.01	<0.01
	Internal biosecurity	227	−0.01	0.11	0.325
	External biosecurity	227	−0.02	0.01	0.353	−0.03	<0.01
	Weaning age	216	−0.05	0.05	0.335	−0.05	0.06
	Years experience	221	<0.01	0.28	0.324
	Pathogens vaccinated	227	0.18	<0.01	0.355	0.14	<0.01
	# sows	227	<0.01	0.01	0.346
	# employees	221	0.05	0.32	0.315
	Gender	214		0.51	0.313
	Male	137	0.11	0.51
	Female	77	Ref.	Ref.
	Education	210		0.39	0.331
	Lower	84	0.07	0.77
	Higher	84	0.28	0.24
	University	42	Ref.	Ref.
	Zinc oxide	205		0.29	0.310
	Yes	39	0.25	0.29
	No	166	Ref.	Ref.
	Anti-inflammatory weaners	227		0.05	0.338
	Yes	71	0.37	0.05
	No	156	Ref.	Ref.
	Anti-coccidial	214		0.10	0.313
	Yes	90	0.28	0.10
	No	124	Ref.	Ref.
	Farrowing rhythm	219		<0.01	0.360		<0.01
	>5	18	−0.78	0.05		−0.88	0.02
	5	20	−1.15	<0.01		−1.10	<0.01
	4	48	−0.51	0.07		−0.44	0.11
	3	80	−0.38	0.12		−0.21	0.42
	2	21	0.10	0.75		−0.06	0.85
	1	32	Ref.	Ref.		Ref.	Ref.
Number of weaned piglets per sow per year (WSY)	Years experience	217	−0.02	0.27	0.354
	External biosecurity	223	0.05	<0.01	0.362
	Internal biosecurity	223	0.03	0.06	0.349
	Weaning age	212	−0.17	<0.01	0.367	−0.19	<0.01
	Pathogens vaccinated	223	0.18	0.06	0.349
	Mortality until weaning	222	−0.18	<0.01	0.423	−0.21	<0.01
	#sows	223	<0.01	<0.01	0.391
	#employees	217	0.22	0.02	0.359
	TI Breeding	223	0.01	<0.01	0.362	0.01	0.06
	TI 200	223	<0.01	0.71	0.339
	Anti-inflammatory sucklers	223
	Yes	122	0.43	0.39	0.340
	No	105	Ref.	Ref.
	Anti-inflammatory weaners	223
	Yes	71	0.57	0.13	0.345
	No	156	Ref.	Ref.
	Anti-inflammatory sows	215
	Yes	217	1.18	0.49	0.343
	No	2	Ref.	Ref.
	Anti-coccidial	211
	Yes	90	0.08	0.82	0.337
	No	124	Ref.	Ref.
	Zinc oxide	201
	Yes	39	0.86	0.06	0.363
	No	166	Ref.	Ref.
	Country * Weaning age						0.02
	Belgium * Weaning age					−0.20	0.18
	France * Weaning age					0.21	0.04
	Germany * Weaning age					0.15	0.18
	Sweden * Weaning age					Ref.	Ref.

LOG log transformation. Light gray values in the univariable model indicate that these factors were not significant (p < 0.20) in the univariable model. In the multivariable model p-values which are significant with p < 0.05 are black and bold, 0.05 < p < 0.10 are black and p > 0.10 are light gray. Significant interactions are listed where applicable. All models were corrected for the country effect by adding country in the model as a fixed variable. Only relevant variables are listed