Table 2. Comparison of Downs’ parameters in two groups.
The parameters with significant values include AB plane angle, inter-incisal angle, incisor to occlusal plane angle, and upper incisor to A-pogonion distance.
AB plane angle, A point-B point to nasion-pogonion; UP 1 to A-pog, maxillary incisor to A point-pogonion
| Parameters | Cleft | Normal | t-value | p-value | ||
| Mean | SD | Mean | SD | |||
| Facial angle | 85.36 | 7.69 | 84.84 | 5.25 | 0.279 | 0.781, NS |
| Y axis | 60.56 | 6.51 | 60.28 | 10.47 | 0.114 | 0.910, NS |
| Angle of convexity | 7.2 | 5.79 | 6.04 | 7.90 | 0.592 | 0.557, NS |
| Mandibular plane angle | 23.16 | 5.96 | 24.4 | 6.28 | 1.721 | 0.092, NS |
| Cant of occlusal plane | 12.16 | 5.05 | 10.96 | 4.90 | 0.853 | 0.398, NS |
| AB plane angle | 7.12 | 4.46 | -1.04 | 9.25 | 3.973 | 0.0001, S* |
| Inter-incisal angle | 149.96 | 12.59 | 111.48 | 11.06 | 11.001 | 0.0001, S* |
| Incisor to occlusal plane angle | 15.48 | 3.66 | 37.68 | 21.99 | 4.978 | 0.0001, S* |
| UP 1 to A-pog | -1.12 | 2.70 | 8.64 | 4.22 | 9.741 | 0.0001, S* |