Psyfit, an internet-based intervention in order to promote well-being.

The aim of the study is to evaluate the (cost-)effectiveness of Psyfit, an online mental fitness self help program, on well-being and depressive symptoms. The study design is a two-armed pragmatic randomised controlled trial:

1. 2-month access to Psyfit (experimental condition);

2. Waiting list for 6 months (control condition).
Measurements will be made prior to inclusion and randomisation (t0), 2 months after starting the intervention (t1), 6 months after starting the intervention (t2).

The internet-based self-help intervention is effective in the enhancement of well-being, the reduction of depressive symptoms and in terms of economic costs in comparison to a waiting list control group.

1. t0: baseline;

2. t1: post test, 2 months after t0;

3. t2: follow-up, 6 months after t0.

The intervention concerns a multiple internet-based self-help intervention (‘Psyfit’) aimed at the promotion of well-being en the reduction of depressive symptoms. Based on their needs and current level of well-being they can choose one out of six modules. Each module consists of a four-week program with theoretical information, short films and assignments. Participants can monitor their progress in a personal plan and a mood meter. For sharing experiences and peer-to-peer support an online community is available. Participants are randomized to the intervention of a waitinglist control group. Participants in the watinglist control group are able to attend the intervention 6 months after T0.