| Curvature of NPC | Total | p value | |||||
| Slanted | Slanted Curved | Vertical | Vertical Curved | ||||
| Age group | Group I | 95 | 31 | 7 | 1 | 134 | 0.214 |
| Group II | 40 | 10 | 1 | 3 | 54 | ||
| Group III | 11 | 1 | 0 | 0 | 12 | ||
| Total | 146 | 42 | 8 | 4 | 200 | ||
| Percentage distribution | 73% | 21% | 4% | 2% | 100% | ||