Table 1 Univariate association between preoperative characteristics and prolonged intensive care unit stay
| Â | % of Patients | Prolonged ICU Stay (%) | Odds Ratio (95% CI) | P Value |
|---|---|---|---|---|
Age (years) | ||||
   <70 | 75.4 | 7.9 | Ref. |  |
   70 – 74 | 16.6 | 12.4 | 1.6 (1.3 – 2.1) | <0.001 |
   ≥ 75 | 8.0 | 14.4 | 2.0 (1.5 – 2.6) | <0.001 |
| Â | Â | Â | Trend | <0.001 |
Gender | ||||
   Male | 80.5 | 9.1 | Ref. |  |
   Female | 19.5 | 9.6 | 1.1 (0.8 – 1.3) | 0.58 |
Body mass index (kg/m2) | ||||
   <30 | 72.8 | 8.4 | Ref. |  |
   30 – 34 | 22.1 | 10.4 | 1.3 (1.0 – 1.6) | 0.035 |
   ≥ 30 | 5.1 | 15.0 | 1.9 (1.3 – 2.7) | <0.001 |
| Â | Â | Â | Trend | <0.001 |
Angina class IV | ||||
   No | 68.1 | 7.3 | Ref. |  |
   Yes | 31.9 | 13.1 | 1.9 (1.6 – 2.3) | <0.001 |
NYHA class IV | ||||
   No | 93.9 | 8.7 | Ref. |  |
   Yes | 6.1 | 15.5 | 1.9 (1.4 – 2.6) | <0.001 |
Previous myocardial infarction | ||||
   No | 53.5 | 8.0 | Ref. |  |
   Yes | 46.5 | 10.5 | 1.4 (1.1 – 1.6) | 0.001 |
Recent myocardial infarction | ||||
   No | 94.7 | 8.8 | Ref. |  |
   Yes | 5.3 | 14.8 | 1.8 (1.3 – 2.5) | <0.001 |
Current smoker | ||||
   No | 84.9 | 8.5 | Ref. |  |
   Yes | 15.1 | 12.8 | 1.6 (1.2 – 2.0) | <0.001 |
Hypercholesterolaemia | ||||
   No | 22.1 | 8.0 | Ref. |  |
   Yes | 77.9 | 9.5 | 1.2 (0.9 – 1.5) | 0.13 |
Hypertension | ||||
   No | 49.0 | 7.4 | Ref. |  |
   Yes | 51.0 | 10.8 | 1.5 (1.2 – 1.8) | <0.001 |
Diabetes | ||||
   No | 83.6 | 8.2 | Ref. |  |
   Yes | 16.4 | 14.2 | 1.9 (1.5 – 2.3) | <0.001 |
Renal dysfunction | ||||
   No | 97.8 | 8.5 | Ref. |  |
   Yes | 2.2 | 39.8 | 7.1 (4.8 – 10.5) | <0.001 |
Cerebrovascular disease | ||||
   No | 91.7 | 8.8 | Ref. |  |
   Yes | 8.3 | 13.3 | 1.6 (1.2 – 2.1) | 0.002 |
Peripheral vascular disease | ||||
   No | 87.2 | 8.2 | Ref. |  |
   Yes | 12.8 | 15.9 | 2.1 (1.7 – 2.7) | <0.001 |
Respiratory disease | ||||
   No | 69.2 | 8.2 | Ref. |  |
   Yes | 30.8 | 11.3 | 1.4 (1.2 – 1.7) | <0.001 |
Previous gastric ulcer | ||||
   No | 88.4 | 9.0 | Ref. |  |
   Yes | 11.6 | 10.3 | 1.2 (0.9 – 1.5) | 0.28 |
Previous GI surgery | ||||
   No | 88.3 | 8.9 | Ref. |  |
   Yes | 11.7 | 11.2 | 1.3 (1.0 – 1.7) | 0.061 |
Previous PCI | ||||
   No | 94.1 | 9.2 | Ref. |  |
   Yes | 5.9 | 9.2 | 1.0 (0.7 – 1.5) | 0.97 |
Ejection fraction <30% | ||||
   No | 91.0 | 8.2 | Ref. |  |
   Yes | 9.0 | 18.7 | 2.6 (2.0 – 3.3) | <0.001 |
Triple-vessel disease | ||||
   No | 18.2 | 6.5 | Ref. |  |
   Yes | 81.8 | 9.7 | 1.6 (1.2 – 2.1) | 0.002 |
Left main stenosis >50% | ||||
   No | 81.9 | 9.2 | Ref. |  |
   Yes | 18.1 | 9.2 | 1.0 (0.8 – 1.3) | >0.99 |
Prior Heart surgery | ||||
   No | 97.3 | 9.1 | Ref. |  |
   Yes | 2.7 | 12.9 | 1.5 (0.9 – 2.4) | 0.12 |
Emergency procedure | ||||
   No | 97.9 | 8.8 | Ref. |  |
   Yes | 2.1 | 24.6 | 3.4 (2.1 – 5.2) | <0.001 |