TABLE 3.

Multivariate analysis highlighting factors associated with STEC shedding in dairy cattle from six herds in Michigan^a

Variable	Odds ratio	95% confidence interval	P value
Maximum temp (>28.9°C) 1–5 days before sampling	2.5	1.25, 4.91	0.009
First lactation	1.8	1.09, 2.83	0.02
Days in milk (range, 1–30)	3.9	2.12, 7.18	<0.0001
Access to pasture	0.6	0.35, 0.95	0.03
Anthelmintic treatment	0.5	0.29, 0.76	0.003
Treatment for respiratory infections	0.4	0.21, 0.70	0.002

^aHerd was included as a random effect. Temperature, lactation status, and days in milk were included in the final model, and the values presented for these three variables are adjusted for the other two variables. All additional variables were added separately to the final model and were adjusted for each of these three variables.