Maarten van Egmond

127 The feasibility of telerehabilitation after surgery 6 Standardized operating procedures of all measurements were used to guarantee uniformity and accuracy in operationalization. Trained and experienced physiotherapists performed the standardized measurements. Statistical analysis Data were analysed in the Statistical Package for the Social Sciences (IBM SPSS Statistics for Windows, Version 25.0. IBM Corp, Armonk, New York). Statistical tests were analysed two sided and considered significant with an alpha ≤.05. Baseline characteristics were summarized with descriptive statistics, where discrete variables were expressed as counts with percentages, ordinal variables as median and interquartile ranges (P25-75), and continuous variables as mean and standard deviation, and in case of a skewed distribution, they were expressed as median and interquartile range. Differences in outcomes before and after the intervention were determined by using a paired samples T-test or a Wilcoxon matched-pairs signed rank test for skewed data. Differences between the intervention group and the historical comparison group were tested with a linear mixed model analysis to account for the dependency between observations.