82 Chapter 5 Statistical analysis Implant and overdenture survival, MBLC, clinical parameters and complications were presented as descriptive statistics. Continuous data (MAI and PROMs) were tested for normality using the Shapiro Wilk test and analysing Q-Q-plots. In case normality could be assumed, these data were further analysed using the paired samples t-test, if not, than the Wilcoxon Matched Pairs Signed Ranks test was used as a non-parametric alternative. A p-value of <0.05 was considered statistically significant. All analyses were performed with SPSS 23.0 software (SPSS, Inc, Chicago, Illinois). 5.3 RESULTS Patient characteristics For this study, 15 participants with a mean age of 66.7±7.9 years (range: 48-80 years; 8 male and 7 female) were included. All the participants were either dentate or had an IOD in the mandible. One participant deceased before the 12-month evaluation, resulting in a total of 14 participants available for the final analysis (Figure 5.2). Figure 5.2 | Follow-up Flow Diagram. Implant and overdenture survival rate During the osseointegration phase no implants were lost. During the first year of function, one participant lost both implants and another participant lost one implant due to loss of osseointegration (Table 5.1). As a consequence, prostheses of both participants were also lost, since both prostheses lacked retention after losing the implants, resulting in an implant survival rate of 89.3% and an overdenture survival rate of 85.7%.
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