Table 4. Univariate and Multivariate Cox Regression Analysis of Potential Risk Factors for ICU Mortality in the Study Patients (n = 1,453).

	Univariate HR (95% CI)	Multivariate HR (95% CI)
Patient admitted from ordinary ward	0.818(0.620–1.080)	-
Age	1.002 (0.999–1.014)	-
APACHE II on ICU admission	1.056 (1.029–1.084)**	1.056 (1.028–1.084)**
IAB	1.490 (1.101–2.020)**	1.510 (1.054–1.123)*

*p<0.05,

**p<0.001. Multivariate Cox regression performed by the method of forward stepwise technique was applied. APACHE, Acute Physiology and Chronic Health Evaluation; CI, confidence interval; HR, hazard ratio; IAB, intensive care unit-acquired bacteremia; ICU, intensive care unit.