Table 4.
Paired-t test of µ, SD, RMS, STVC of the extraction side and non-extraction side in three time period
| Metrics | Time period | Mean* | Standard deviation* | Shapiro-Wilk test | Significance | Paired t test | Significance |
|---|---|---|---|---|---|---|---|
| µ | T1-T0 | -0.110 | 0.331 | 0.982 | 0.976 | -1.372 | 0.189 |
| T2-T0 | 0.059 | 0.356 | 0.937 | 0.188 | 0.754 | 0.459 | |
| T2-T1 | 0.122 | 0.471 | 0.927 | 0.222 | 1.037 | 0.316 | |
| SD | T1-T0 | -0.044 | 0.118 | 0.947 | 0.414 | -1.535 | 0.144 |
| T2-T0 | 0.013 | 0.117 | 0.958 | 0.485 | 0.497 | 0.625 | |
| T2-T1 | -0.045 | 0.139 | 0.910 | 0.115 | -1.312 | 0.209 | |
| RMS | T1-T0 | -0.018 | 0.163 | 0.926 | 0.184 | -0.463 | 0.650 |
| T2-T0 | 0.103 | 0.229 | 0.862 | 0.007** | *** | *** | |
| T2-T1 | 0.060 | 0.287 | 0.824 | 0.006** | *** | *** | |
| STVC | T1-T0 | -0.808 | 1.821 | 0.955 | 0.535 | -1.829 | 0.086 |
| T2-T0 | 0.220 | 1.546 | 0.976 | 0.866 | 0.653 | 0.521 | |
| T2-T1 | 0.839 | 1.716 | 0.913 | 0.132 | 1.956 | 0.069 |
*The mean and standard deviation of the difference of the extracted side and the non-extracted side
**P < 0.05, so the data did not follow the normal distribution
***The data were analyzed by Wilcoxon signed rank test. The results showed that there was no significant difference in RMS of two sides (P > 0.05)