Table 1.
Pre-intra-and postoperative characteristics among patients with and without SWI
| Variables | Group 1* (n = 9157) | Group 2** (n = 44) | P value |
| Age (mean ± SD) | 58.5 ± 9.7 | 60.1 ± 8.7 | 0.173 |
| BMI (mean ± SD) | 27 ± 4 | 28.3 ± 4 | 0.032 |
| Female % | 25.5 | 52.3 | < 0.001 |
| Smoking % | 39.5 | 34.1 | 0.467 |
| Diabetes % | 33.7 | 59.1 | < 0.001 |
| Hypercholesterolemia % | 61 | 65.9 | 0.508 |
| Hypertension % | 49.7 | 90.9 | < 0.001 |
| PVD % | 1.8 | 2.8 | 0.666 |
| Length of preoperative hospital stay (days) (mean ± SD) | 8.2 ± 4.9 | 9.4 ± 6.1 | 0.098 |
| CCS (Functional class) (mean ± SD) | 2.1 ± 0.8 | 2.6 ± 0.7 | < 0.001 |
| LVEF (mean ± SD) | 49.1 ± 10.2 | 50.7 ± 11.2 | 0.260 |
| Graft number (mean ± SD) | 3.6 ± 0.9 | 3.6 ± 1 | 0.928 |
| Cross clamp time (minute) (mean ± SD) | 42.4 ± 41.5 | 45 ± 16.4 | 0.686 |
| Perfusion time (minute) (mean ± SD) | 70.1 ± 26 | 75.2 ± 23.5 | 0.207 |
| Re-exploration for bleeding | 1% | 13.6% | < 0.001 |
| Intubation time (hours) (mean ± SD) | 8.9 ± 13.6 | 54.1 ± 172.1 | < 0.001 |
Body mass index, BMI; Peripheral vascular disease, PVD; Canadian Cardiovascular Society classification, CCS; left ventricular ejection fraction, LVEF
* Without sternal wound infection
** With sternal wound infection