Table 3.

Unadjusted and adjusted Cox proportional regression model of PNI and 30-day mortality.

30-day mortality	Crude model	P value	Model 1	P value	Model 2	P value
	HR (95% CIs)		HR (95% CIs)		HR (95% CIs)
Low tertile	1.0 (ref.)	/	1.0 (ref.)	/	1.0 (ref.)	/
Middle tertile	0.54 (0.32, 0.92)	0.023	0.50 (0.29, 0.85)	0.011	0.57 (0.31, 1.05)	0.070
High tertile	0.37 (0.21, 0.68)	<0.001	0.41 (0.23, 0.75)	0.004	0.39 (0.19, 0.80)	0.011

Values were expressed as hazard ratios (95% confidence intervals). Model 1 was adjusted for age and sex. Model 2 was adjusted for age, gender, hypertension, diabetes mellitus, coronary heart disease, chronic kidney disease, malignancy, white blood cell count, hemoglobin, platelet count, albumin, alanine transaminase, serum creatinine, serum sodium, serum potassium, pH, PO₂, PCO₂, bicarbonate, simplified acute physiology score II, and sequential organ failure assessment.