Table 3. Patient demographics and USD score and classification system of validation group.
| Variable | Low surgery complexity | High surgery complexity | P |
|---|---|---|---|
| Number | 104 | 66 | – |
| Gender | 0.207 | ||
| Male | 52 (50.0) | 26 (39.4) | |
| Female | 52 (50.0) | 40 (60.6) | |
| Age (year) | 36.07±13.69 | 41.98±13.25 | 0.06 |
| BMI (kg/m2) | 24.03±2.93 | 24.64±3.84 | 0.413 |
| USD score system (points) | |||
| Etiology score | 2 [1–2] | 2 [2–2] | <0.001 |
| Segment score | 1 [0–3] | 2 [0–3] | <0.001 |
| Length score | 1 [1–3] | 5 [1–5] | <0.001 |
| Aggregate score | 4 [2–8] | 7 [4–10] | <0.001 |
| USD score distribution | <0.001 | ||
| 2 points | 10 (9.6) | 0 | |
| 3 points | 40 (38.5) | 0 | |
| 4 points | 33 (31.7) | 3 (4.5) | |
| 5 points | 17 (16.3) | 10 (15.2) | |
| 6 points | 0 | 5 (7.6) | |
| 7 points | 2 (1.9) | 21 (31.8) | |
| 8 points | 2 (1.9) | 4 (6.1) | |
| 9 points | 0 | 3 (4.5) | |
| 10 points | 0 | 20 (30.3) | |
| Operation time (min) | 129.24±74.41 | 273.79±76.24 | <0.001 |
| EBL (mL) | 10 [0–100] | 100 [10–1,000] | <0.001 |
| Surgical procedure complex score (points) | 3 [2–3] | 6 [4–6] | <0.001 |
Data are presented in terms of mean ± standard deviation, median [range] or n (%) USD, ureter stricture disease; BMI, body mass index; EBL, estimated blood loss.