| Variable | Preoperative | Postoperative | χ2 | p | ||
| No. | % | No. | % | |||
| EHL grading | 23.6* | <0.001 | ||||
| Grade 1 | 1 | 100.0 | 0 | - | ||
| Grade 2 | 4 | 100.0 | 0 | - | ||
| Grade 3 | 11 | 84.6 | 2 | 15.4 | ||
| Grade 4 | 12 | 52.2 | 11 | 47.8 | ||
| Grade 5 | 2 | 10.5 | 17 | 89.5 | ||
| FHL grading | 19.6* | <0.001 | ||||
| Grade 2 | 4 | 100.0 | 0 | - | ||
| Grade 3 | 10 | 100.0 | 0 | - | ||
| Grade 4 | 9 | 40.9 | 13 | 59.1 | ||
| Grade 5 | 7 | 29.2 | 17 | 70.8 | ||