| Number of surgeries per daya, N (IQR) | 10 | (8–12) | 5 | (3–6) | | | <.0001 |
| Sexb, men, N (%) | 2994 | (82) | 670 | (18) | 3664 | (49) | 0.45 |
| Women, N (%) | 3062 | (81) | 716 | (19) | 3778 | (51) | |
| Agea, years (IQR) | 56 | (38–72) | 41 | (24–61) | | | <.0001 |
| Duration of staya, days (IQR) | 7 | (4–16) | 5 | (2–8) | | | <.0001 |
| Time of anaesthesiaa, minutes (IQR) | 142 | (97–211) | 115 | (80–163) | | | <.0001 |
| Time of operationa, minutes (IQR) | 92 | (58–153) | 70 | (42–108) | | | <.0001 |
| Emergencyb, N (%) | 712 | (75) | 235 | (25) | 947 | (13) | <.0001 |
| Elective, N (%) | 5344 | (82) | 1151 | (18) | 6495 | (87) | |
| ASA Classb I, N (%) | 2904 | (77) | 869 | (23) | 3773 | (51) | <.0001 |
| II | 2597 | (86) | 428 | (14) | 3025 | (41) | |
| III | 525 | (87) | 77 | (13) | 602 | (8) | |
| IV | 28 | (72) | 11 | (28) | 39 | (0.5) | |
| V | 2 | (67) | 1 | (33) | 3 | (0.04) | |
