Table 3.

Univariate and multivariable analysis of factors associated with ICU mortality.

	Univariate analysis		Multivariable analysis
	Hazard ratio	P value	Hazard ratio	P value
Age†	1.04 (1.00–1.09)	.03	1.05 (1.01–1.08)	.008
Immunocompromised status	2.97 (1.19–7.41)	.019	3.69 (1.68–8.09)	.001
Performance status††	2.19 (1.19–4.02)	.011
Charlson comorbidity index††	1.30 (1.07–1.59)	.009
PaO2/FiO2 ratio††	0.99 (0.98–1.00)	.06	0.99 (0.98–0.99)+	.028
SAPS2††	1.03 (1.01–1.06)	.002
Documented bacterial co-infection	1.13 (0.45–2.80)	.79
Acute Kidney Injury	3.75 (0.48–28.79)	.2

FiO₂ = fraction of inspired oxygen, HR = hazard ratio, PaO₂ = arterial oxygen partial pressure, SAPS = simplified acute physiology score.

^†Risk for each 1-year increase,

^††Risk for each 1-point increase.