Statistical Analyses
depression, anxiety
Owing to the high dropout rate, we did not assume the PHQ-9 and GAD-7 scores to be normally distributed; therefore, we used nonparametric statistical tests for analyzing the effectiveness of the intervention. We used the Kruskal-Wallis test for comparing the reduction in depression or anxiety symptom severity from baseline to the primary end point among the 3 groups. All the tests were 2 tailed unless otherwise mentioned. For post hoc analysis between the groups, we used the Mann-Whitney Because this was the first trial of TreadWill, we did not have a prior estimate of the dropout rate and could not perform power calculations. We chose the sample size of 600 participants based on the previous studies of similar nature [