Patient characteristics
| Patient characteristics | Missing values | Total population (n=3776) | Total hip replacement (n=2494) | Total knee replacement (n=1282) |
| Age, mean (SD), years | 0.10% | 60.2 (15.8) | 57.7 (17.0) | 65.1 (11.7) |
| Gender: female, no. (%) | 0.10% | 2298 (60.9) | 1468 (58.9) | 829 (64.7) |
| BMI, mean (SD), kg/m2 | 2.60% | 27.5 (5.2) | 26.6 (4.7) | 29.3 (5.6) |
| Smoking: yes, no. (%) | 24.70% | 498 (13.2) | 341 (13.7) | 157 (12.2) |
| ASA classification, no. (%) | 0.40% | |||
| I | 839 (22.2) | 669 (26.8) | 170 (13.3) | |
| II | 2091 (55.4) | 1314 (52.7) | 777 (60.6) | |
| III | 829 (22.0) | 500 (20.0) | 329 (25.7) | |
| Diagnosis hip, no. (%) | 0.40% | |||
| Arthrosis | 1599 (64.1) | |||
| Rheumatoid arthritis | 68 (2.7) | |||
| Dysplasia | 241 (9.7) | |||
| Osteonecrosis | 228 (9.1) | |||
| Other | 349 (14.0) | |||
| Diagnosis knee, no. (%) | 0.90% | |||
| Arthrosis | 1037 (80.9) | |||
| Rheumatoid arthritis | 123 (9.6) | |||
| Other | 111 (8.7) | |||
| Side affected: right, no. (%) | 0.30% | 1915 (50.9) | 1257 (50.4) | 658 (51.3) |
| Surgical complications, no. (%) | 0% | |||
| Surgical site infection | 38 (1.0) | 25 (1.0) | 13 (1.0) | |
| Venous thromboembolism | 26 (0.7) | 17 (0.7) | 9 (0.7) | |
| Postoperative bleeding | 47 (1.2) | 28 (1.1) | 19 (1.5) | |
| Luxation | 32 (0.8) | 31 (1.2) | 1 (0.1) | |
| Delirium | 24 (0.6) | 20 (0.8) | 4 (0.3) | |
| Nerve damage | 24 (0.6) | 21 (0.8) | 3 (0.2) |
ASA, American Society of Anesthesiologists; BMI, body mass index.