Table 5. Multivariable Cox proportional hazard model to identify risk factors for in-hospital mortality.

Variables	Univariable			Multivariable
	HR	95% CI	P value	HR	95% CI	P value
Age ≥ 65 (years)	11.507	3.431–38.597	< 0.001	4.668	1.250–17.430	0.022
Male sex	3.580	1.589–8.066	0.002	1.062	0.356–3.166	0.914
Hypertension	6.026	2.391–15.186	< 0.001	1.588	0.452–5.581	0.470
Diabetes mellitus	7.100	3.103–16.249	< 0.001	2.470	0.900–6.783	0.079
Neutrophil/lymphocyte ratio	1.223	1.162–1.286	< 0.001	1.167	1.078–1.264	< 0.001
Blood urea nitrogen (mg/dL)	1.075	1.055–1.095	< 0.001	0.990	0.936–1.048	0.738
eGFR < 60 (ml/min/1.73 m2)	10.255	4.583–22.949	< 0.001	1.318	0.352–4.932	0.682
Albumin (g/dL)	0.099	0.053–0.183	< 0.001	0.378	0.120–1.191	0.097
C-reactive protein (mg/dL)	1.141	1.098–1.185	< 0.001	0.898	0.793–1.016	0.089
Creatine kinase (U/L)	1.002	1.000–1.003	0.006	1.002	1.001–1.004	0.007
Lactate dehydrogenase (U/L)	1.002	1.001–1.002	< 0.001	1.001	1.000–1.003	0.104
Severe acute kidney injury	38.355	16.964–86.721	< 0.001	12.199	4.235–35.141	< 0.001