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Table 2 Multivariate cox proportional hazard model for length of hospital stay

From: Blood transfusion in cardiac surgery is a risk factor for increased hospital length of stay in adult patients

Variable Hazard ratio p
(95% CI)
Age (years)   
<65 Reference  
≥65 1.36 (1.09 – 1.7) 0.006
EuroSCORE   
<3 Reference  
3–5 1.46 (1.13 – 1.88) 0.003
>5 1.71 (1.27 – 2.3) <0.001
Procedure   
CABG Reference  
Valve 1.6 (1.28 – 1.99) <0.001
CABG + valve 1.73 (1.12 – 2.67) 0.013
Left ventricular ejection fraction (%)   
<40 1.63 (1.19 – 2.24) 0.002
40–59 1.32 (1.07 – 1.64) 0.010
≥60 Reference  
Units of RBC transfused   
None Reference  
Low-transfusion (1–3 units) 1.16 (0.94 – 1.42) 0.164
High-transfusion (>3 units) 2.00 (1.44 – 2.79) <0.001
  1. Abbreviations: CI, confidence interval; CABG, coronary artery bypass graft surgery; min, minutes; RBC; red blood cells.