| Total | Perioperative adverse events | P-value |
---|---|---|---|
All | 465 | 33 (7.1Â %) | Â |
Age (year) | Â | Â | 0.071 |
  ≤ 39 | 4 | 1 (25.0 %) |  |
 40–49 | 6 | 1 (16.7 %) |  |
 50–59 | 56 | 8 (14.3 %) |  |
 60–69 | 152 | 12 (7.9 %) |  |
 70–79 | 197 | 8 (4.1 %) |  |
  ≥ 80 | 50 | 3 (6.0 %) |  |
Sex | |||
 Male | 76 | 6 (7.9 %) | 0.767 |
 Female | 389 | 27 (6.9 %) |  |
Body mass index | |||
  < 30 | 333 | 22 (6.6 %) | 0.857 |
  ≥ 30 | 26 | 3 (11.5 %) |  |
 Missing | 106 | 8 (7.5 %) |  |
Smoking | |||
 Nonsmoker | 322 | 19 (6.0 %) | 0.128 |
 Ex or current smoker | 35 | 4 (11.4 %) |  |
 Missing | 75 | 10 (13.3 %) |  |
Charlson Comorbidity Index | |||
 0 | 423 | 26 (6.1 %) | 0.001 |
  ≥ 1 | 42 | 7 (16.7 %) |  |
Mean hospital volume (per year) | |||
  ≤ 4 | 269 | 29 (10.8 %) | < 0.001 |
  ≥ 5 | 196 | 4 (2.0 %) |  |
Underlying diagnosis | |||
 Osteoarthritis | 286 | 13 (4.5 %) | 0.007 |
 Rheumatoid arthritis | 179 | 20 (11.2 %) |  |
Anesthesia time | |||
  < 200 min | 270 | 7 (2.6 %) | < 0.001 |
  ≥ 200 min | 195 | 26 (13.3 %) |  |