Enhancing Group Lifestyle Intervention for Depression With Self-Tracking Tools: A Randomized Controlled Trial

This study will be a randomized controlled trial on the effects of group-based LM as an intervention for depression. Prior to all study procedures, an online informed consent (with phone support) will be obtained from potential participants. Around 90 eligible participants will be randomly assigned to either the LM intervention with self-tracking tools (LM/S), pure LM intervention (LM), or care-as-usual (CAU) control group in a ratio of 1:1:1. The randomization will be performed by an independent assessor using a computer-generated list of numbers. In order to obtain unbiased data with respect to the participants' attitudes and behaviors, incomplete disclosure will be used to withhold the self-tracking component in this trial. Participants in the two LM groups will receive six weekly group lifestyle modification sessions (~2 hours each) at the Chinese University of Hong Kong (an online approach will be adopted if face-to-face sessions are not possible due to COVID-19). The group treatment will primarily be delivered by clinical psychology trainees under the supervision of a clinical psychologist and other healthcare professionals such as a dietitian and a fitness trainer. The CAU group will continue receiving the routine care as usual and be given a smartphone-based LM intervention after the completion of follow-up assessments. Both the treatment groups and control group will complete a set of online questionnaires before the treatment commences, immediately after treatment, and 12 weeks after the treatment sessions are completed. In addition, participants in the LM/S group will complete a set of self-developed survey questions related to lifestyle and mood on a daily basis.