Group | 1 month after the operation | 3 months after the operation | 6 months after the operation |
A (n = 19) | 43.08 ± 1.84 | 27.46 ± 1.24 | 12.18 ± 0.97 |
B (n = 20) | 27.46 ± 1.52* | 6.98 ± 0.64* | 0* |
P value | 0.012 | 0.006 | 0.000 |