Table 2. Multivariable comparison of cases and controls, fluoroquinolone-resistant Escherichia coli colonization, long-term care facility study*.

Variable	Unadjusted OR	Adjusted OR (95%CI)	p value
Fluoroquinolone use	7.71	9.16 (2.08, 40.41)	0.003
Duration of residence in facility†§		1.00 (1.00, 1.01)	0.07
Metronidazole use	8.90	5.90 (0.52, 66.50)	0.15

*CI, confidence interval.
†Days from admission into facility until study enrollment.
§Odds ratio (OR) reflects the odds associated with each increase in 1 day of residence in the facility.