Table 1.
Baseline demographics and univariate analysis of patients undergoing MUA
| Total | Patients undergoing MUA | ||||
|---|---|---|---|---|---|
| Demographic | n | % | n | % | p value |
| Eligible patients | 7386 | 131 | 1.77 | ||
| Sex | 0.75 | ||||
| Male | 3202 | 43.4 | 55 | 1.72 | |
| Female | 4184 | 56.6 | 76 | 1.82 | |
| Hospital | < 0.001 | ||||
| Hospital A | 2316 | 31.4 | 22 | 0.95 | |
| Hospital B | 1613 | 21.8 | 18 | 1.12 | |
| Hospital C | 3457 | 46.8 | 91 | 2.63 | |
| Age (years) | |||||
| Continuous | |||||
| Mean ± SD | 68.3 (± 9.4) | 65.6 (± 9.3) | < 0.001 | ||
| Categorical | |||||
| < 65 | 2843 | 38.5 | 72 | 2.53 | < 0.001 |
| ≥ 65 | 4543 | 61.5 | 59 | 1.30 | |
| ASA score | 0.482 | ||||
| 1 or 2 | 4924 | 66.7 | 91 | 1.85 | |
| 3 or 4 | 2411 | 32.6 | 39 | 1.62 | |
| NR | 51 | 0.7 | 1 | 1.96 | |
| BMI | |||||
| Continuous | |||||
| Mean ± SD | 32.3 (± 6.4) | 32.0 (± 5.5) | 0.748 | ||
| Categorical | |||||
| < 25 | 634 | 8.6 | 7 | 1.10 | 0.33 |
| 25–29.9 | 1989 | 26.9 | 38 | 1.91 | |
| 30–34.9 | 2002 | 27.1 | 41 | 2.05 | |
| ≥ 35 | 2390 | 32.4 | 37 | 1.55 | |
| NR | 371 | 5.0 | 8 | 2.16 | |
| Computer-assisted navigation | < 0.001 | ||||
| Yes | 3379 | 45.7 | 83 | 2.46 | |
| No | 4007 | 54.3 | 48 | 1.20 | |
| Surgical duration (min) | |||||
| Continuous | |||||
| Median (IQR) | 87 (70–107) | 85 (69–105) | 0.287 | ||
| Categorical | |||||
| ≤ 100 | 4847 | 65.6 | 90 | 1.86 | 0.487 |
| > 100 | 2338 | 31.7 | 38 | 1.63 | |
| NR | 201 | 2.7 | 3 | 1.49 | |
| Surgeon level | 0.42 | ||||
| Consultant | 5763 | 78.0 | 106 | 1.84 | |
| Trainee | 1623 | 22.0 | 25 | 1.54 | |
| Cancer | 0.192 | ||||
| Yes | 761 | 10.3 | 18 | 2.37 | |
| No | 6625 | 89.7 | 113 | 1.71 | |