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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.