Table IV.

Unconditional associations between predictor variables and the occurrence of Salmonella positive pooled fecal samples from pens on 10 farrow-to-finish pig farms from Alberta and Saskatchewan

Variable	Levels of response	β (coefficient)a	95% CI (β)	P-value
Sex	overall			0.018
	gilt(s)	−0.85	−1.34 to −0.36	0.001
	barrow(s)	−0.55	−1.03 to −0.67	0.026
	mixed pen	−1.65	−2.39 to −0.92	0.001
	sow(s)	Reference
Fecal score	overall			0.071
	normal	−1.48	−3.28 to 0.31	0.11
	hard/dry	−0.40	−2.53 to 1.74	0.72
	runny	Reference
Fed pelleted feed	yes	0.95	0.19 to 1.71	0.014
	no	Reference
Fed wet feed	yes	0.57	0.09 to 1.06	0.020
	no	Reference
Fed on floor	yes	0.57	0.08 to 1.24	0.087
	no	Reference
Pen cleanliness	overall			0.008
	slightly wet/dirty	0.34	−0.06 to 0.74	0.10
	moderately wet/dirty	0.19	−0.52 to 0.90	0.60
	very wet/dirty	−1.17	−2.11 to 0.22	0.016
	clean	Reference
Pen floor type	overall			0.46
	part slatted	0.65	0.28 to 1.03	0.001
	not slatted	0.15	−1.21 to 1.51	0.83
	full slatted	Reference
Concrete floor	yes	0.77	0.40 to 1.14	0.000
	no	Reference
Nose-to-nose contact between pens	yes	0.67	0.16 to 1.18	0.009
	no	Reference
Production phase	overall			0.089
	nursery/weaners	−0.73	−1.17 to −0.29	0.001
	grow-finishers	−1.10	−1.56 to −0.63	0.000
	sows	Reference
Number of pigs in pen	−0.05	−0.07 to −0.03	0.000	Number of pigs in pen
Pig density	0.67	0.28 to 1.06	0.001	Pig density

95% CI — 95% confidence interval.

^aLog odds ratio from random-effects logistic regression model.