Table 6. Descriptive statistics of the cephalometric 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 | |||||||||
| Go-Gn (mm) | 1.64 | 2.00 | 0.004 * ‡ | 1.18 | 1.54 | 0.005 * ‡ | -0.46 | 0.452 ‖ | -1.68 | 0.77 |
| Co-Go (mm) | 1.49 | 1.60 | 0.003 ‡ | 1.05 | 1.57 | 0.014 ‡ | -0.44 | 0.483 ‖ | -1.53 | 0.65 |
| Co-Gn (mm) | 1.77 | 1.38 | <0.001 * | 1.53 | 2.15 | 0.008 | -0.24 | 0.702 | -1.49 | 1.01 |
| Co-Go-Gn (degree) | -0.25 | 2.15 | 0.639 | -1.63 | 2.80 | 0.024 | -1.38 | 0.111 | -3.11 | 0.34 |
| CP-FH (mm) | -0.84 | 0.82 | 0.001 * | -1.68 | 0.75 | <0.001 * | -0.84 | 0.003 * | -1.38 | -0.30 |
| CP-Y (mm) | -0.15 | 1.23 | 0.266 ‡ | -1.29 | 1.03 | 0.001 * ‡ | -1.14 | 0.003 * ‖ | -1.92 | -0.36 |
| FP-FH (mm) | 0.04 | 1.21 | 0.904 ‡ | -0.81 | 0.51 | <0.001 * | -0.91 | 0.004 * ‖ | -1.53 | -0.29 |
| FP-Y (mm) | -0.11 | 0.77 | 0.557 ‡ | -0.82 | 0.54 | <0.001 * ‡ | -0.71 | 0.004 * ‖ | -1.14 | -0.27 |
| AJS (mm) | 0.05 | 0.50 | 0.701 | 0.12 | 0.30 | 0.103 | 0.07 | 0.600 | -0.21 | 0.36 |
| SJS (mm) | 0.10 | 0.54 | 0.309 ‡ | -0.71 | 0.76 | <0.001 * ‡ | -0.81 | 0.017 ‖ | -1.26 | -0.36 |
| PJS (mm) | 0.07 | 0.35 | 0.421 | -0.93 | 0.91 | <0.001 * | -1.00 | <0.001 * | -1.48 | -0.52 |
Bonferroni's correction was applied to adjust the alpha level due to multiplicity. Adjusted alpha level was 0.005.
SD: standard deviation.
†
Paired t-test.
‡
Wilcoxon signed-rank test.
§
Two-sample t test.
‖
Mann-Whitney U test.
*
Statistically significant at p<0.005.