Demographic variables.

Objective
Self-efficacy is associated with positive mental health outcomes. We developed and tested a digital self-efficacy training for daily recall of autobiographical self-efficacy memories (e.g., memories of successfully overcoming a personal challenge).
Method
In this randomized controlled trial, we investigated the effects of the week-long digital self-efficacy training on key mental health outcomes, including anxiety, stress, and hopelessness, and on self-efficacy in 93 university students (mean age 23.3 years, SD: 3.49) with elevated self-reported stress levels. Participants completed either the self-efficacy training combined with ecological momentary assessment (EMA) (training group) or EMA only (control group).
Results
We found significantly reduced hopelessness and trait anxiety in the training group compared to the control group at post-assessment (one day post intervention). Effects on ratings of self-efficacy at post-assessment were also significant when controlling for baseline self-efficacy.
Conclusions
This stand-alone digital self-efficacy training was significantly associated with a number of positive effects on outcomes compared to a control condition, including reduced hopelessness, trait anxiety, and increased self-efficacy. Future work is needed to replicate and investigate the long-term effects of the training and explore its implementation in clinical populations.
Trial registration
ClinicalTrials.gov Identifier: NCT05617248