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01.12.2018 | Study protocol | Ausgabe 1/2018 Open Access

BMC Psychiatry 1/2018

An internet-based intervention for people with psychosis (EviBaS): study protocol for a randomized controlled trial

BMC Psychiatry > Ausgabe 1/2018
Nina Rüegg, Steffen Moritz, Thomas Berger, Thies Lüdtke, Stefan Westermann
Wichtige Hinweise

Electronic supplementary material

The online version of this article (https://​doi.​org/​10.​1186/​s12888-018-1644-8) contains supplementary material, which is available to authorized users.



Evidence shows that internet-based self-help interventions are effective in reducing symptoms for a wide range of mental disorders. To date, online interventions treating psychotic disorders have been scarce, even though psychosis is among the most burdensome disorders worldwide. Furthermore, the implementation of cognitive-behavioral therapy (CBT) for psychosis in routine health care is challenging. Internet-based interventions could narrow this treatment gap. Thus, a comprehensive CBT-based online self-help intervention for people with psychosis has been developed. The aim of this study is the evaluation of the feasibility and efficacy of the intervention compared with a waiting list control group.


The intervention includes modules on delusion, voice hearing, social competence, mindfulness, and seven other domains. Participants are guided through the program by a personal moderator. Usage can be amended by an optional smartphone app. In this randomized controlled trial, participants are allocated to a waiting list or an intervention of eight weeks. Change in positive psychotic symptoms of both groups will be compared (primary outcome) and predictors of treatment effects will be assessed.


To our knowledge, this project is one of the first large-scale investigations of an internet-based intervention for people with psychosis. It may thus be a further step to broaden treatment options for people suffering from this disorder.

Trial registration

NCT02974400 (, date of registration: November 28th 2016.
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