Logistic regression of implant return vs. type, length and diameter.

Logistic regression models of Early/ Type A loss (80% of all losses occurred within 160 days after implantation), Delayed / Type B loss (15% of all losses occurred between 160 and 761.5 days after implantation), and Late / Type C loss (5% of all losses occur at last 761.5 days after implantation). Crude odds ratios (OR) are univariate, adjusted OR are multivariate models. In round brackets the 95% confidence interval (CI) of the OR is printed. Probability of the Wald’s test (probability of OR equal to 1, i.e. parameter has no influence) and likelihood ratio test (likelihood ratio test of model reduced by the factor compared to full model). The most sold implant (Screwline with 4.3 mm diameter and 13 mm length) was taken as reference.