Blinding
RECRUITMENT
All the participants followed the same recruitment procedure. Consequently, the participants were unaware of which version of TreadWill they were assigned to (they did not even know that 2 different versions existed). Therefore, we expected placebo effects in the 2 groups to be similar. In addition, the PHQ-9 and GAD-7 data were self-reported on the website; therefore, there was no scope for evaluator bias.