Table 1 Results of intergroup comparability of the ages, treatment, follow-up, retention times, gender and initial malocclusion distribution (independent t test and Chi-square test)
Variables | Group 1 Mild crowding (N = 16) | Group 2 Severe crowding (N = 25) | P | ||
|---|---|---|---|---|---|
Mean | SD | Mean | SD | ||
Initial age (T1) | 13.45 | 1.57 | 13.25 | 2.20 | 0.756 |
Final age (T2) | 15.98 | 1.97 | 15.40 | 2.25 | 0.409 |
Follow-up age (T3) | 54.93 | 3.78 | 52.85 | 6.23 | 0.239 |
Treatment time (T2-T1) | 2.53 | 0.72 | 2.15 | 0.43 | 0.046* |
Follow-up time (T3-T2) | 38.95 | 2.88 | 37.45 | 5.23 | 0.302 |
Retention time | 1.80 | 0.73 | 2.48 | 1.27 | 0.062 |
Gender distribution | 9 (21.95%) female 7 (17.07%) male | 17 (41,46%) female 8 (19.51%) male | 0.447Chi | ||
Initial malocclusion | 12 (29.26%) Class II 4 (9.76%) Class I | 5 (12.20%) Class II 20 (48.78%) Class I | 0.000* chi | ||