From: Survival of maxillary and mandibular bonded retainers 10 to 15 years after orthodontic treatment: a retrospective observational study
Predictor
Hazard ratio
95% CI
P value
Type of retainer
.016″ × .022″ braided SS
Reference
.027″ TMA
0.42
0.22
0.81
0.009
Age at T3 (per unit = 1 year)
1.09
0.98
1.2
0.121
Gender
Male
Female
0.55
0.28
1.1
0.085