Epidemiology of extended-spectrum beta-lactamase-producing Enterobacteriaceae in an intensive care unit with no single rooms

Annals of Intensive Care

Table 4 Multivariate analysis of factors associated with ESBL acquisition

Variable	Reference	Odds ratio	95% Confidence interval
ICU length of stay (days)
<4	3	0.92	0.82, 1.04
4–7	6	1.00	1.00, 1.00
7–10	9	1.08	0.96, 1.22
>10	15	1.28	0.89, 1.83
SAPS II
<32	25	1.00	1.00, 1.00
33–45	40	1.89	1.11, 3.24
45–60	53	3.44	1.22, 9.68
>60	73	7.40	1.38, 39.59

Multivariate logistic regression including 218 complete observations
Hosmer–Lemeshow p value 0.6
SAPS II and ICU length of stay were included as continuous variables
SAPS II was not transformed
ICU length of stay was included using the following equation x ² − 1.96 where x = (los)/10
Covariates were included as continuous variables in the multivariable model
Presented odds ratios were calculated for the reference indicated in the table