Randomized Controlled Trials of Digital Mental Health Interventions on Patients with Schizophrenia Spectrum Disorder: A Systematic Review

Background: This systematic review aimed to examine the study protocol of Digital Mental Health Interventions (DMHIs) and to review the effect of DMHIs among patients with Schizophrenia Spectrum Disorder (SSD).Methods: This review followed the guideline of Preferred Reporting Items for Systematic Reviews and Meta-Analyses (PRISMA). A systematic literature search was performed using PubMed, CINAHL, Embase, and PsycINFO electronic databases to identify randomized clinical trials without any limit on the publication year. Overall, 18 studies were selected and evaluated for the quality assessment utilizing the Risk of Bias 2 tool of Cochranes' Collaboration. In the quality assessment, four studies evaluated as overall high risk of bias were excluded from the selection, and the final 14 studies were chosen.Results: No DMHIs were provided for acute schizophrenia-related symptoms, and there were some studies related to schizophrenia-related symptoms (26.4%). Some studies for improving cognitive function (42.9%) were reported, and there was a significant effect when interventions that were proven to be effective when implemented in a face-to-face manner were delivered using various online devices and sensory stimuli. Nearly half of the studies reported intervention frequency and time (57.1%), and those with unclear reports relied either on a mobile app or telemedicine and were designed to self-pace the frequency and speed of the intervention.Conclusion: Based on our findings, it will be possible to understand the characteristics of DMHIs, without physical contact, for only SSD patients, providing a basis for digital mental health services.