TABLE 5.

Farm factors associated with the prevalence of Yersinia pseudotuberculosis in herds with correlation analyses

Variable	All farms			Conventional			Organic
	n	ra	P	n	ra	P	n	ra	P
Moderate or large numbers of rodents in the piggery	15	0.931	0.000	10	NCc	NC	5	0.984	0.002
Low stocking density (m2/pig)	15	0.806	0.000	10	−0.084	0.817	5	0.845	0.072
Number of mo that pigs have access to outdoor area	15	0.704	0.003	10	NC	NC	5	0.598	0.286
Pest and pet animals hygiene scoreb	15	0.673	0.006	10	0.278	0.436	5	0.628	0.257
Slaughter pigs have access to outdoor areas	15	0.647	0.009	10	NC	NC	5	0.482	0.411
Birds have access to piggery	15	0.636	0.011	10	0.650	0.050	5	0.590	0.295
Dogs have access to piggery	9	0.722	0.028	5	−0.250	0.685	4	0.985	0.015
Slaughter pigs drink from trough	15	0.560	0.030	10	0.550	0.099	5	0.590	0.295
Organic production	15	0.529	0.043	10	NC	NC	5	NC	NC
Moist area around drinker	15	0	1.000	10	0.002	0.999	5	0.984	0.002
Large group size	15	−0.202	0.471	10	0.939	0.047	5	−0.546	0.341

^aPearson correlation coefficient.

^bFrom the work of Siekkinen et al. (30).

^cNC, could not be calculated.