Table 5. Descriptive statistics of the area and volumetric changes that occurred in each group (T2-T1) as well as the p-values of significance tests.
| Control group (N=17) | Chin-cup group (N=18) | Control group vs Chin-cup group | ||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| Mean | SD | P value † | Mean | SD | P value † | Mean | P-value § | 95% Confidence Interval of the difference | ||
| Lower bound | Upper bound | |||||||||
| Mandibular volume (mm 3) | 1,221.62 | 641.52 | <0.001 * ‡ | 777.24 | 797.42 | 0.002 * ‡ | -444.38 | 0.110 ‖ | -943.94 | 55.18 |
| Mandibular area size (mm 2) | 833.84 | 1,051.05 | 0.005 * | 722.40 | 1,335.40 | 0.003 * ‡ | -111.44 | 0.785 | -941.21 | 718.33 |
| Condyle volume (mm 3) | 132.54 | 84.79 | <0.001 * ‡ | 94.57 | 91.76 | 0.001 * ‡ | -37.97 | 0.184 ‖ | -98.83 | 22.89 |
| Condyle area size (mm 2) | 88.49 | 100.20 | 0.002 * | 66.08 | 48.05 | <0.001 * | -22.41 | 0.401 | -75.96 | 31.14 |
Bonferroni's correction was applied to adjust the a level due to multiplicity. Adjusted alpha level was 0.0125.
SD: standard deviation.
†
Paired t-test.
‡
Wilcoxon signed-rank test.
§
Two-sample t test.
‖
Mann-Whitney U test.
*
Statistically significant at p<0.0125.