72 Chapter 4 distributed data as median with interquartile range (IQR). We chose to present costs (both in € and US $) as mean with standard deviation (SD), as we wanted to include the weight of outliers on both sides. A median value is also presented to provide a better interpretation of these data and improve the comparability to other studies. Completeness of data is specified in supplementary file 2. We used SPSS software (V.24.0.0.1; SPSS, USA) for statistical analysis. For the randomized controlled trial, of which this study was part, we performed a sample size calculation based on the primary outcome of the study. We estimated that 80 patients were needed to detect a clinically relevant between-group difference in the primary outcome.19 As post-hoc power analyses are discouraged and this is a descriptive study, we refrained from performing an additional power calculation. RESULTS Patient population All 80 patients that were included in the clinical trial completed the questionnaires for this cross-sectional study (missing data 0%). The median (IQR) age in our study population was 50 (44-54) years with 39 participants being male (49%). The median (IQR) Body Mass Index (BMI) was 25.7 kg/m2 (23.9-30.0) and median (IQR) symptom duration was 63 weeks (40-127). All registered patient characteristics are shown in Table 1.
RkJQdWJsaXNoZXIy MTk4NDMw