| Patient groups | (41) | (59) |
| Age | 66 - 77 | 68 - 81 |
| Sex | Male | Female |
| BMI (obesity) | 28.2 | 28.9 |
| Smoking (average) | (yes) 12; (no) 29; | (yes) 15; (no) 44; |
| Duration of surgery | 210 min | 210 min |