This systematic review aims to examine the content, usage pattern and efficacy of mobile mental health interventions in reducing anxiety symptoms. A search of 10 electronic database returned 44 408 studies in total and 27 studies met the inclusion criteria, including 4460 participants in total. The rate of attrition was 27% (SD = 22) among the participants who initiated the app use. The rate of significant reductions in measures of anxiety symptoms was 87% from within-subjects pretest to posttest assessments, yet this rate dropped to 46% when compared to a waitlist/control group. A vast majority of the studies used cognitive and/or behavioral interventions (N = 26, 96%), a few studies included professional support (N = 11, 41%), a structured form of delivering the interventions (N = 8, 30%) or tailored it to users needs (N = 6, 22%). Few studies reported the actual time spent on the app per week (N = 4, M = 63.76, SD = 62.17). The mobile mental health interventions were effective in reducing anxiety symptoms, yet this effectiveness eroded compared to control groups. There is a need to develop consistent ways of reporting the usage patterns and testing evidence-based interventions other than cognitive behavioral treatments.
Key words: generalized anxiety, panic attack, social anxiety, mHealth, systematic review
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