2.3. Statistical analysis
A power of 86% and confidence interval of 95% were adopted, with an estimated value for a type I error of 5% for the sample size calculation in this study. A value for 14 patients was obtained. However, because this is a new exercise method, we recruited 20 patients. The Kolmogorov–Smirnov test was used to assess the normality of the distribution. Analysis of variance for repeated measurements on one factor (one group × four measurements × four parameters) with the independent variable of the exercise method (6MWT, VR, no-VR, and SSE-VR) and dependent variables as the control parameters (HR, SpO