| Grade | W1 | W2 | W3 | W4 | W5 |
| n (%) | n (%) | n (%) | n (%) | n (%) | n (%) |
| Pre-operative | 00 (0.0) | 00 (0.0) | 00 (0.0) | 00 (0.0) | 24 (100) |
| Post-operative | 09 (37.5) | 7 (29.17) | 7 (29.17) | 1 (4.17) | 00 (0.0) |