Digital Psychological Interventions for Adults in the COVID-19 Pandemic: A Systematic Review and Meta-Analysis

This study evaluates the effect of digital psychological interventions on anxiety, depression, and stress symptoms in adults affected by the pandemic. A systematic search across five digital databases, from 1 January 2020 to 6 March 2024, identified 36 studies encompassing 8,662 participants. Compared with all control conditions, random-effects meta-analyses indicated that digital psychological interventions significantly reduced anxiety (g = -0.374; 95% CI, -0.529 to -0.218), depression (g = -0.568; 95% CI, -0.776 to -0.360), and stress (g = -0.452; 95% CI, -0.608 to -0.295). Smaller effect sizes were observed when compared with active controls than with inactive controls. Notable heterogeneity across three outcomes was observed. Publication bias was noted in depression symptoms. Several moderators were identified compared with inactive controls, including participant type for anxiety (p_subgroup = 0.005), and region for depression symptoms (p_subgroup = 0.000). Larger sample sizes (b = 0.0004; p = 0.028) related to stronger effects on depression symptoms. Publication year positively correlated with effects on stress (b = 0.1573; p = 0.032). This study supports the efficacy of digital psychological interventions in alleviating anxiety, depression, and stress symptoms for adults during the pandemic, offering insights for developing targeted mental health strategies in future public health crises.