Table 1.
Baseline sociodemographic, clinical and operative details of the study sample
| No. of patients* (n = 792) | |
|---|---|
| Age (years)† | 53·2(17·5) |
| No. of men | 364 (46·0) |
| Duration of surgery (h) | |
| < 1 | 213 (28·3) |
| 1–2 | 182 (24·2) |
| 2–3 | 139 (18·5) |
| > 3 | 218 (29·0) |
| Missing | 40 |
| Type of operation | |
| Caesarean section | 95 (12·2) |
| Oesophagogastric resection/gastrectomy | 17 (2·2) |
| Pancreatobiliary resection | 38 (4·9) |
| Antireflux surgery | 12 (1·5) |
| Bariatric surgery | 6 (0·8) |
| Cholecystectomy | 102 (13·1) |
| Colectomy/hemicolectomy | 95 (12·2) |
| Hartmann procedure/reversal | 21 (2·7) |
| Rectal/anterior resection | 72 (9·2) |
| Stoma formation alone | 11 (1·4) |
| Stoma closure/reversal alone | 19 (2·4) |
| Small bowel resection | 38 (4·9) |
| Groin hernia repair | 61 (7·8) |
| Abdominal wall hernia repair | 37 (4·7) |
| Appendicectomy | 57 (7·3) |
| Diagnostic laparoscopy/laparotomy | 31 (4·0) |
| Adhesiolysis | 12 (1·5) |
| Other | 56 (7·2) |
| Missing | 12 |
| Type of surgery | |
| Elective | 606 (81·3) |
| Unplanned | 139 (18·7) |
| Missing | 47 |
| Risk factor | |
| Smoker | |
| Current | 114 (14·7) |
| Ex‐smoker < 1 month | 236 (30·4) |
| No | 426 (54·9) |
| Missing | 16 |
| Diabetes, any type (n = 775) | 60 (7·7) |
| ASA grade | |
| I | 232 (31·7) |
| II | 373 (51·0) |
| III | 118 (16·1) |
| IV | 8 (1·1) |
| Missing | 61 |
| BMI (kg/m2)† (n = 762) | 28·0(6·1) |
*
With percentages as proportions of available data (excluding missing values) in parentheses unless indicated otherwise;
†
values are mean(s.d.).