| Grade | p63 | |||||
| Negative | Weak | Moderate | Strong | Total | ||
| Grade I | N | 0 | 0 | 1 | 7 | 8 |
| % | 0.00 | 0.00 | 12.50 | 87.50 | 100.00 | |
| Grade II | N | 9 | 26 | 55 | 21 | 111 |
| % | 8.11 | 23.42 | 49.55 | 18.92 | 100.00 | |
| Grade III | N | 17 | 17 | 7 | 0 | 41 |
| % | 41.46 | 41.46 | 17.07 | 0.00 | 100.00 | |
| Grade IV | N | 2 | 0 | 0 | 0 | 2 |
| % | 100.00 | 0.00 | 0.00 | 0.00 | 100.00 | |
| Total | N | 28 | 43 | 63 | 28 | 162 |
| % | 17.28 | 26.54 | 38.89 | 17.28 | 100.00 | |
| Chi-square | X2 | 71.168 | ||||
| P-value | 0.000 | |||||