Table 1.
Patient characteristics Values are count (%) unless otherwise specified
| Factor | n (%) |
|---|---|
| Age median (IQR) | 70 (14) |
| < 50 | 514 (4.9) |
| 50–60 | 1,671 (16) |
| 61–65 | 1,384 (13) |
| 66–70 | 2,055 (19) |
| 71–75 | 2,218 (21) |
| 76–80 | 1,639 (16) |
| 81–85 | 806 (7.6) |
| > 85 | 289 (2.7) |
| BMI median (IQR) | 27.4 (6.5) |
| < 18.5 | 94 (0.9) |
| 18.5–24.9 | 4,110 (39) |
| 25–29.9 | 2,968 (28) |
| 30–34.9 | 2,237 (21) |
| 35–39.9 | 788 (7.5) |
| > 39.9 | 279 (2.7) |
| Missing | 100 (0.9) |
| Female sex | 6,213 (59) |
| Walking aid | 2,391 (23) |
| Missing | 195 (1.8) |
| Living alone | 3,632 (35) |
| In institution | 75 (0.7) |
| Missing | 80 (0.8) |
| Smoking | 1,347 (13) |
| Missing | 89 (0.8) |
| Alcohol > 24 g/day | 790 (7.5) |
| Missing | 91 (0.9) |
| Total knee arthroplasty | 4,448 (42) |
| Psychiatric disease | 1,520 (14) |
| Missing | 0 (0.0) |
| Cardiac disease | 1,439 (14) |
| Missing | 106 (1.0) |
| Pulmonary disease | 945 (9.0) |
| Missing | 64 (0.6) |
| Hypertension | 5,911 (56) |
| Missing | 0 (0.0) |
| Diabetes mellitus | |
| Non-insulin dependent | 912 (8.8) |
| Insulin dependent | 199 (1.9) |
| Missing | 61 (0.6) |
| Anticoagulants | 821 (7.8) |
| Missing | 0 (0.0) |
| Preoperative anemia a | 2,522 (24) |
| Missing | 155 (1.5) |
a Hemoglobin < 13 g/dL.