2.7. Statistical Analysis
The calculated sample size involved 78 subjects based on a power of 80% using ANOVA: repeated measures between factors, two groups, three time points, and an effect size of 0.25 at the α = 0.05 significance level. The sample size was estimated using G * Power version 3.1.9.7 (a program written by Franz Faul, Universität Kiel, Germany) [