Statistical analysis
fracture
SECONDARY
The statistician was blinded to the type of study groups. The statistical analysis followed the intention-to-treat protocol, in accordance with the CONSORT.For the primary outcome fracture and retention, the survival rates of the different research groups were calculated using the Kaplan–Meier, estimating the hazard ratios (HR) and 95% confidence intervals. The logrank test was used to compare the survival distributions of these restorations (α=0.05). The absolute and relative risks of all approaches were also estimated. A 95%CI was reported. Cohen’s kappa statistics were used to evaluate inter-examiner agreement (α=0.05) (MedCalc Software, Version 19.1, Ostend, Belgium). For the secondary outcomes, the restoration groups for each category were compared using the Pearson’s Chi-square test, and the Cochran Q-test was used to compare the changes across different time points within each restorative material (α=0.05) (IBM SPSS version 22.0, SPSS, Chicago, IL, USA).