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Background characteristics of patients included in the study
| Median of age at time of surgery (years) | 68 (30–84) |
| Gender M:F (F%) | 39:54 (58%) |
| Right knee:left knee (R%) | 51:42 (55%) |
| Body mass index mean (kg/m2) | 30 (17–41) |
| ASA score mean | 2.8 |
| ASA 1 | 1 (1%) |
| ASA 2 | 29 (31%) |
| ASA 3 | 51 (55%) |
| ASA 4 | 12 (13%) |
ASA American Society of Anesthesiologists
