Table 1.
Demographic and clinical characteristics of the two groups
| Characteristic | Study group (n = 12) | Control group (n = 15) | p-value |
|---|---|---|---|
| Sex | 0.440 | ||
| Female | 8 (66.7) | 12 (80.0) | |
| Male | 4 (33.3) | 3 (20.0) | |
| Age (yr) | 22.6 ± 7.1 | 21.9 ± 12.5 | 0.317 |
| Treatment | |||
| Patients treated with clear aligners | 5 (41.7) | 8 (53.3) | 0.554 |
| Patients treated with multi-bracket appliance | 7 (58.3) | 7 (46.7) | 0.554 |
| Intercanine width (mm) | |||
| At baseline | 23.4 ± 1.4 | 23.5 ± 3.1 | 0.133 |
| At 6 mo | 26.9 ± 2.0 | 28.7 ± 2.2 | 0.081 |
| Retention | |||
| Removable retainer with fixed retainer | 9 (75.0) | 13 (86.7) | 0.449 |
| Removable retainer only | 3 (25.0) | 2 (13.3) |
Values are presented as number (%) or mean ± standard deviation.
Chi-square test and Mann–Whitney U test were used to compare the mean values between the two groups.