Table 3. Logistic Regression Models of 28 days Survival of ICU Patients.

Variables	Odd Ratio	95% CI	P value
Time Period	0.93	0.88–0.98	0.01
Age, per group	1.23	1.14–1.32	<0.001
SOFA, per point	1.21	1.19–1.22	<0.001
DNR	6.07	5.40–6.82	<0.001
Elixhauser score, per point	1.06	1.05–1.08	<0.001
Surgical/Trauma ICU admission (versus Medical ICU)	1.19	1.06–1.35	0.01
COPD	0.90	0.79–1.03	0.13
CHF	0.86	0.76–0.98	0.02
DM	1.04	0.91–1.20	0.57
CRF	0.86	0.71–1.03	0.10

First admissions (n = 7265).

SOFA, sequential organ failure assessment; DNR, do not resuscitate; COPD, chronic obstructive pulmonary disease; CHF, congestive heart failure; DM, Diabetes Melitus; CRF, chronic renal failure.