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Table 8 Failures per patient in the mandible and maxilla according to the type of retainer

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

   Mean (SD) Median p25 p50 p75
Mandible .016″ × .022″ braided SS (N = 47) 2.17 (3.15) 1.0 0 1 3
.027″ TMA (N = 41) 0.66 (1.03) 0 0 0 1
Total (N = 88) 1.47 (2.52) 0.5 0 0.5 2
Maxilla .016″ × .022″ braided SS 4 incisors (N = 82) 1.14 (2.93) 0 0 0 1
  1. p25 = lower quartile (25%); p75 = upper quartile (75%)