Procedure
MDD
SECONDARY, BLIND
Participants were assessed at preprogram, postprogram, 3-month follow-up, and within each session. All participants completed a preprogram assessment that included clinical interview and self-report measures evaluating MDD and related symptoms, after which they were assigned a randomized condition if eligible for study inclusion. The study assessor was blind to participants’ randomized condition throughout the study. Within 2 weeks of the preprogram assessment, participants began their assigned program. During the 6-week programs, participants completed brief self-report assessments immediately prior to and following each session. Within 2 weeks after their final weekly session, participants completed a postprogram assessment, and a final assessment 3 months later. Participants did not receive financial compensation but were allowed to keep the Fitbit device used for secondary data collection if the device was worn for at least 50% of the study period. Study procedures were approved by the Naval Medical Center San Diego Institutional Review Board. Study methods were performed in compliance with all applicable Federal regulations governing the protection of human subjects.