Table 4.

Final multivariable logistic regression analysis of variables significantly (P ≤ 0

Variable	β	S.E.(β)	ORa	95% CI (ORa)	P-value
Intercept	1.24	0.57	-	-	-
Herd size
0: ≥ 121	Refb	-	-	-	-
1: 55-120	-1.52	0.74	0.22	0.05; 0.93	0.04
2: < 55	-2.28	0.70	0.10	0.03; 0.40	0.001
Resistant to tetracycline?
0:No	Refb	-	-	-	-
1:Yes	1.66	0.64	5.25	1.48; 18.6	0.01

^aOR = Odds ratio

^bRef = reference category