Table 1 Baseline characteristics of the two mandibular and the two maxillary retainer groups
Mandible | Maxilla | ||||||
|---|---|---|---|---|---|---|---|
.016″ × .022″ braided SS 6 incisors (N = 47) mean (SD) or (%) | .027″ TMA (N = 41) mean (SD) or (%) | total mean (SD) or (%) | .016″ × .022″ braided SS 4 incisors (N = 82) mean (SD) or (%) | .016″ × .022″ braided SS 6 incisors (N = 6) mean (SD) or (%) | total mean (SD) or (%) | ||
Age at T3 (year) | 27.8 (2.9) | 27.9 (1.8) | 27.8 (2.4) | 27.7 (2.3) | 29.9 (2.6) | 27.8 (2.4) | |
Gender | Male | 12 (25.5%) | 13 (31.7%) | 25 (28.4%) | 24 (29.3%) | 1 (16.7%) | 25 (28.4%) |
Female | 35 (74.5%) | 28 (68.3%) | 63 (71.6%) | 58 (70.7%) | 5 (83.3%) | 63 (71.6%) | |
Duration (year) | Treatment (T1–T2) | 3.1 (1.5) | 2.9 (1.1) | 3.0 (1.3) | 2.9 (1.2) | 4.2 (1.9) | 3.0 (1.3) |
Retention (T2–T3) | 12.6 (1.2) | 13.3 (1.1) | 12.9 (1.2) | 12.9 (1.2) | 12.4 (1.4) | 12.9 (1.2) | |