Table 2.
Mean and standard deviation (sd) of the differences between T2 and T1 values for each patient
| Control group | RPE group | Diff T2-T1 | t test | Effect size | |||||
|---|---|---|---|---|---|---|---|---|---|
| Unit | Mean | sd | Mean | sd | p value | d value | ES | ||
| 36–46 (occlusal) | mm | −0.8 | 0.8 | 1.1 | 1.5 | 1.9 | 0.00 | 0.6 | Large |
| 36–46 (lingual) | mm | −0.1 | 0.4 | 0.6 | 1.2 | 0.7 | 0.00 | 0.8 | Large |
| 33–43 | mm | −0.6 | 0.8 | 0.4 | 1.6 | 1.0 | 0.01 | 0.4 | Medium |
| 36 angulation | ° | −3.3 | 5.2 | 6.2 | 5.8 | 9.5 | 0.00 | ||
| 33 angulation | ° | −6.0 | 5.0 | 0.7 | 5.5 | 6.7 | 0.00 | ||
| 43 angulation | ° | −2.7 | 6.6 | 0.7 | 7.4 | 3.4 | ns | ||
| 46 angulation | ° | −3.8 | 5.7 | 4.3 | 6.8 | 8.1 | 0.00 | ||
| 31 angulation | ° | −2.5 | 4.0 | 2.0 | 4.1 | 4.4 | 0.00 | ||
| 41 angulation | ° | −2.4 | 3.5 | 1.8 | 3.1 | 4.2 | 0.00 | ||
| Molar angulation (mean) | ° | −3.5 | 5.5 | 5.2 | 6.3 | 8.8 | 0.00 | 0.6 | Large |
| Canine angulation (mean) | ° | −4.4 | 5.8 | 0.7 | 6.4 | 5.1 | 0.01 | 0.4 | Medium |
| Incisor angulation (mean) | ° | −2.4 | 3.7 | 1.9 | 3.6 | 4.3 | 0.00 | 0.5 | Medium |
Diff. T2-T1 mean differences between RPE and control groups; ns not significant, p > 0.05
d Cohen’s effect size value, ES effect size