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Difficulty grade score
| Variable | Low difficulty (6–11 points) | Medium difficulty (12–24 points) | High difficulty (25–37 points) | Significance |
|---|---|---|---|---|
| Length of operation in minutes—median (interquartile range) | 200 (220–250) | 248 (216–263) | 290 (241–317) | P = 0.006 |
| Blood loss in milliliter—median (interquartile range) | 50 (50–140) | 300 (225–375) | 600 (250–1,000) | P < 0.001 |
| VAS difficulty score—median (interquartile range) | 3 (3–4) | 8 (7–8) | 8 (7–9) | P < 0.001 |
| Radical excision tumor | 100% | 100% | 83% | P = 0.043 |
