Table 1.
Means and standard deviations (SD) of age and skeletal, dentoalveolar, soft-tissue and face height variables and results of t test for both groups
| Group 1 Caucasian subjects (n=40) | Group 2 Afro-Caucasian subjects (n=40) | ||||
|---|---|---|---|---|---|
| Variable | Mean | SD | Mean | SD | P |
| Age | 13.02 | 0.78 | 13.02 | 0.67 | 0.978 |
| Maxillary component | |||||
| SNA angle (°) | 81.14 | 3.78 | 82.94 | 4.23 | 0.046* |
| Mandibular component | |||||
| SNB angle (°) | 79.02 | 3.51 | 80.53 | 3.66 | 0.061 |
| Maxillomandibular relationship | |||||
| ANB angle (°) | 2.13 | 2.14 | 2.42 | 2.14 | 0.556 |
| Facial Height | |||||
| TAFH (mm) | 110.59 | 4.33 | 108.63 | 4.33 | 0.087 |
| UAFH (mm) | 50.61 | 2.03 | 48.14 | 2.65 | 0.000* |
| LAFH (mm) | 59.97 | 4.89 | 60.49 | 3.89 | 0.603 |
| TPFH (mm) | 70.95 | 4.69 | 69.55 | 5.54 | 0.225 |
| UPFH (mm) | 28.19 | 2.80 | 29.77 | 3.36 | 0.025* |
| LPFH (mm) | 42.76 | 4.34 | 39.78 | 4.29 | 0.002* |
| Maxillary dentoalveolar component | |||||
| MxI.NA (°) | 22.60 | 5.38 | 26.78 | 5.28 | 0.000* |
| MxI-NA (mm) | 5.73 | 2.01 | 7.27 | 2.17 | 0.001* |
| Mandibular dentoalveolar component | |||||
| MdI.NB (°) | 24.52 | 3.69 | 31.97 | 4.57 | 0.000* |
| MdI-NB (mm) | 3.81 | 1.95 | 5.50 | 2.01 | 0.000* |
| IMPA (mm) | 90.38 | 5.45 | 97.78 | 4.95 | 0.000* |
| Soft tissue | |||||
| Nasolabial angle (°) | 110.26 | 8.68 | 98.93 | 11.42 | 0.000* |
| Upper lip protrusion (mm) | 3.40 | 1.03 | 5.76 | 1.73 | 0.000* |
| Lower lip protrusion (mm) | 2.51 | 1.08 | 4.71 | 2.09 | 0.000* |
*
Statistically significant at P<.05