| Cormack & Lehane Grades | |||||
| Age groups | Grade-1 n = 166 | Grade-2 n = 28 | Grade-3 n = 2 | p-value | |
| Tn distance | Childrenless than 5 years (n = 120) | 10 (9 - 10.6)* | 9.5 (9.2 - 10) | 8.8 (7.8 - 9.8) | 0.002 |
| Children 5 years and above (n = 76) | 10.7 (10.5 - 11.5) | 10.8 (10.5 - 11) | --- | 0.961 | |
| Tm distance | Children less than 5 years (n = 120) | 4.5 (4 - 5)* | 4 (3.5 - 4.5) | 3.5 (3 - 4) | 0.025 |
| Children 5 years and above (n = 76) | 5 (4.7 - 5.5) | 6.2 (6 - 6.5)* | --- | 0.021 | |