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Table 2 Repeated measure analysis of variance, comparing retention loss in (Newton) between different time periods of measurement (Primary retention vs one, two, and three years of use) in each studied group

From: Retention of bar clip attachment for mandibular implant overdenture

  PEEK clip
p value
Nylon clip
P value
T0–T1 0.000* 1.000 NS
T0–T2 0.000* 0.002*
T0–T3 0.000* 0.195 NS
T1–T2 1.000 NS 0.420 NS
T1–T3 0.000* 0.006*
T2–T3 0.001* 0.000*
  1. T0, at time of overdenture insertion; T1, after 1 year of use; T2, after 2 years of use; T3, after 3 years of use; NS, Statistically not significant (p ≥ 0.05)
  2. *Statistically significant (p < 0.05)