Table 2.

Final hierarchical multivariable logistic regression model of predictors for S. Dublin isolation from faecal cultures in 14 endemically infected dairy herds

Predictors	β	s.e.	OR (95% CI)	P
Intercept	−4·680	0·477
Age, years	−0·544	0·136	0·6 (0·4–0·8)	<0·0001
Temporal antibody profile (TAP)				0·002
TAP1: Persistently high antibodiesa,b	2·103	1·056	8·2 (1–65)
TAP2: Recent increasea	2·183	0·585	8·9 (3–28)
TAP3: Fluctuating or moderately high antibodiesb	1·258	0·440	3·5 (1–8)
TAP4: Recent low antibodiesc	0	—

OR, Odds ratio; CI, confidence interval.

^a,b,c Variable levels with different superscript letters were significantly different at the 5% significance level.