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Table 1 Baseline characteristics of the two mandibular and the two maxillary retainer groups

From: Survival of maxillary and mandibular bonded retainers 10 to 15 years after orthodontic treatment: a retrospective observational study

  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 (T1T2) 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 (T2T3) 12.6 (1.2) 13.3 (1.1) 12.9 (1.2) 12.9 (1.2) 12.4 (1.4) 12.9 (1.2)