Table 6.

Odds ratios of the independent variables included in the logistic regression models

Milk pathogens	Lack of practice	Odds ratioa	Interval confidence 95 %	P valueb
S. aureus	High hygiene during milking	6.9	2.8–17.4	<0.001
	Hot water use	3.4	1.5–7.9	0.004
	Official milk control implementation	4.6	1.6–13.3	0.003
	Milking mastitic cows at the end	2.4	1.1–5.5	0.04
	Abrupt cessation of milking	2.0	0.9–4.5	0.09
Coliformsc	Glove use	5.8	1.3–27.0	0.007
	Hot water use	4.4	1.6–12.0	0.002
	Calf suck its dam	2.7	1.0–7.0	0.04

^aHerds with practice as referent

^bLikelihood ratio test (1 d.f.)

^cColiform bacteria: Klebsiella oxytoca, Klebsiella pneumoniae, and Serratia marcescens