| Group | 1 month after the operation | 3 months after the operation | 6 months after the operation | |||
| Good | bad | Good | bad | Good | bad | |
| A (n = 19) | 19 (100) | 0 | 10 (52.61) | 9 (47.48) | 9 (47.48) | 10 (52.65) |
| B (n = 20) | 20 (100) | 0 | 20 (100)* | 0 | 20 (100)* | 0 |
| P value | 0.000 | 0.000 | 0.000 | |||