90 Chapter 4 These seven items measure six domains: (a) pain (2 items), (b) psychological discomfort (1 item), (c) physical disability (1 item), (d) psychological disability (1 item), (e) social disability (1 item), and (f) handicap (1 item). Each item was scored on a Likert scale from 1 ‘Never’ to 5 ‘Very often’. Statistics Statistical analysis was done by calculating means and standard deviations (SD) for continuous variables; medians and inter quartile range (IQR) for ordinal and non-normal distributed data. Cross-tabulations were made for categorical variables. A Chi2 test was used for categorical outcomes; when the table was two by two the Fisher’s exact test was used. Given the small amount of patients available for contacting, no sample size calculation was performed. Values of the implant-supported obturator group versus the surgical reconstruction group were compared with independent t-tests in case of normal distribution, otherwise the Mann-Whitney U test was applied. Normal distribution was verified by using the Shapiro-Wilk test. The Mann-Witney U Test was used to test between the two patient groups for the OHIP item outcomes (ordinal data). Statistical analyses were regarded as significant, if the p-value was equal to or lower than .05. Data were evaluated using SPSS (IBM version 24 for Mac).
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