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Table 4 Cox regression for the effect of retainer type on mandibular lingual retainer survival adjusted for age at T3 and gender

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 Reference    
Female 0.55 0.28 1.1 0.085