Table 2.

The association between albumin, RDW, RAR and 90-day mortality of patients with AMI by univariate and multivariate Cox models

Variables	Model 1		Model 2		Model 3
	HR (95% CI)	P	HR (95% CI)	P	HR (95% CI)	P
Albumin
Low level	Ref		Ref		Ref
High level	0.47 (0.40–0.56)	< 0.001	0.71 (0.60–0.85)	< 0.001	0.77 (0.64–0.93)	0.007
RDW
Low level	Ref		Ref		Ref
High level	2.05 (1.72–2.45)	< 0.001	1.34 (1.11–1.62)	0.002	1.31 (1.08–1.61)	0.007
RAR
Low level	Ref		Ref		Ref
High level	2.84 (2.36–3.42)	< 0.001	1.76 (1.45–2.13)	< 0.001	1.65 (1.34–2.03)	< 0.001

Model 1 was the univariate Cox model (unadjusted); Model 2: adjusted for age, vasopressor use, sequential organ failure assessment score, simplified acute physiology score II score, glasgow coma scale score and elixhauser comorbidity index score; Model 3: adjusted for age, marital status, respiratory rate, heart rate, diastolic blood pressure, white blood cell, potassium, calcium, pH, creatinine, bicarbonate, hemoglobin, pulse oximetry-derived oxygen saturation, intensive care unit length, vasopressor use, sequential organ failure assessment score, simplified acute physiology score II score, glasgow coma scale score, elixhauser comorbidity index score, percutaneous coronary intervention and coronary artery bypass graft

HR, hazard ratio; CI, confidence interval; Ref, reference; RDW, red blood cell distribution width; RAR, the ratio of the RDW to albumin; AMI: acute myocardial infarction