Table 2.

Odds ratios (95% Wald confidence intervals) for covariates in the final model* that determine antimicrobial resistance (higher Antimicrobial Resistance Index, ARI) in Escherichia coli from retired patients that have been prescribed antimicrobials at least 2 days prior to sampling

Co-variate	Odds ratio [95%CI]	Co-variate	Odds ratio [95%CI]
Gender (male)	1.29 [1.14–1.45]	Log(time)	0.83 [0.81–0.85]
N_prescriptions	1.05 [1.04–1.06]	Survival (yes)	0.84 [0.78–0.92]
%Injectable	1.00 [0.99–1.00]	N_prescriptions * %Injectable	1.0004 [1.0001–1.0007]
		N_prescriptions * gender (male)	0.97 [0.956–0.99]

N_prescriptions: number of preceding antimicrobial prescriptions received 2 days or more before each sample; %Injectable: proportion of parenteral (non-oral) preceding antimicrobial prescriptions. *Laboratory identity (n = 15) was controlled for in the final model (p < 0.0001), but individual values were not included in the Table