Table 2.
Multivariate cox proportional hazard model for length of hospital stay
| 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 |
Abbreviations: CI, confidence interval; CABG, coronary artery bypass graft surgery; min, minutes; RBC; red blood cells.