Internet-based Mindfulness-based Training (iMBT) for People With Depression

The research goals of this randomized controlled trial are to determine the feasibility and the mechanism of change of iMBT that has been developed using the Acceptance Checklist for Clinical Effectiveness Pilot Trials. The primary research question is as follows: What is the effectiveness of the iMBT in relation to improvements on depressive symptoms among people with clinical depression, relative to a usual care control after the intervention and in 3-month follow-up? Secondary questions include the following: Which facet(s) of mindfulness (i.e., observe, describe, act with awareness, non-react and non-judgement) improved during the intervention? How does the growth trajectory of different facets of mindfulness relate to the improvement of well-being and reduction of ill-being? The investigators hypothesize that: H1 Participants in iMBT group will have greater reduction in depressive symptoms and increase in all facets of mindfulness and mental well-being, than the usual care group at post-intervention, and 3-month follow-up. H2 Using latent growth analysis, the intraindividual growth trajectory of the monitor and acceptance facets of mindfulness would mediate the effect of iMBT on the intraindividual changes in depressive symptoms. H3 Using multi-group analysis, in accord with Acceptance and Monitor theory, the relationship between the growth trajectory of monitor facets of mindfulness and the growth trajectory of depressive symptoms will be moderated by the level of acceptance. People with greater acceptance of inner experience will benefit more from the change of monitor facets of mindfulness in iMBT.