| Grade | P1 | P2 | P3 | P4 | P5 |
| n (%) | n (%) | n (%) | n (%) | n (%) | n (%) |
| Pre-operative | 00 (0.0) | 00 (0.0) | 00 (0.0) | 00 (0.0) | 24 (100) |
| Post-operative | 18 (75) | 05 (20.83) | 01 (4.17) | 00 (0.0) | 00 (0.0) |