Effective elements of eHealth interventions for mental health and well-being in children and adolescents: A systematic review

Background: Mental health problems among children and adolescents increased in recent years, while mental health services are overburdened with long waiting lists. eHealth interventions, that is, interventions delivered digitally via apps or websites, offer a promising approach to prevent and efficiently treat emerging mental health problems in youth. Over the past years, rapid technological progress has led to diverse eHealth interventions for youth mental health. However, a structured overview of effective eHealth elements and mechanisms through which interventions aim to improve mental health is lacking. The aim of this pre-registered systematic review is to identify elements of eHealth interventions that improve mental health and well-being in children and adolescents aged 10–25 from both clinical and general populations. Methods: This systematic review conducted in April 2023 in accordance with the Preferred Reporting Items for Systematic Review and Meta-Analysis guidelines identified 108 studies and 103 distinct interventions between 2011–2023. The overall sample size was 33,435 participants (30.7% male, mean age = 18.4 years, SD = 2.5). Most studies (64.8%) were randomized controlled trials (RCTs) to test the interventions. The remaining studies utilized a pre-post or group-comparison design (non-RCTs). Results: The interventions were heterogeneous in design, method of delivery, target group and outcome measures. Overall, 77.7% of the studies showed a positive significant association between eHealth intervention and mental health or well-being. Elements that were often related to improved mental health and well-being were cognitive behavioural therapy (CBT) or self-monitoring as therapeutic principles, blended approaches combining eHealth with traditional therapy, peer/parental involvement and technological gamification elements, such as rewards. Conclusions: Elements of youth eHealth interventions that appear to positively impact mental health or well-being are (a) CBT-based, (b) self-monitoring (c) blended interventions, (d) peer or parental involvement or (e) gamification. Future directions for the development and implementation of eHealth interventions for youth are discussed.