Table 4 Descriptive statistics regarding the survival rate of different retainer wires in the mandible
Retainer | Time at risk | Event observed | Incidence rate | No. of subjects | Survival time | P value† | ||
|---|---|---|---|---|---|---|---|---|
25% | 50% | 75% | ||||||
Retainium | 934 | 14 | .015 | 32 | 12 | 48 | 0.195 | |
Orthoflex | 889 | 21 | .024 | 41 | 12 | 36 | ||
Bond-A-Braid | 1017 | 13 | .013 | 40 | 12 | |||
Total | 2840 | 48 | .017 | 113 | 12 | 48 | ||