Facilitator Contact, Discussion Boards, and Virtual Badges as Adherence Enhancements to a Web-Based, Self-guided, Positive Psychological Intervention for Depression: Randomized Controlled Trial.

Although this interaction should be interpreted with caution given the marginal significance and the very small number of participants in this group (those with the highest levels of depression who received the VB), this pattern was also apparent in our analyses with the proportion of intervention completed as an outcome (the number of pages viewed as a proportion of the total possible number of pages; Multimedia Appendix 1 ).

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Given that the effects among participants in 3 of the 4 depression groups (mild, moderate, and severe but not moderately severe) did not reach statistical significance, caution is warranted in drawing conclusions based on these data.

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