TABLE 2.

Multivariable Cox Proportional Hazards Regression Model of Risk Factors Associated with Fluoroquinolone-Resistant Escherichia coli Colonization in Hospitalized Patients

Variable	HR (95% CI)	P
LOS before the initial sample	1.02 (1.01–1.03)	.003
Admission to hospital 2	2.05 (1.12–3.74)	.02
Central venous catheter	0.67 (0.40–1.13)	.13
Malignancy	0.37 (0.21–0.67)	.001
Receipt of cefepimea	1.05 (1.00–1.10)	.048
Receipt of a first-generation cephalosporina,b	1.19 (1.10–1.29)	<.001

note. CI, confidence interval; HR, hazard ratio; LOS, length of stay.

^aModeled as a time-varying covariate.

^bCefazolin and cephalexin.