Brief online ACT intervention to improve adolescents' well-being: Effectiveness among adolescents with depressive symptoms during COVID-19

Background: The mental health and well-being of children and adolescents declined globally during the COVID19 pandemic. Young people need support, yet relatively few receive psychological help, even among those who experience psychological symptoms. The existing options for support that focus on the traditional one-on-one treatment delivery approach require alternatives that can be widely disseminated. Purpose: The current study examined the effectiveness of a brief acceptance- and values-based online intervention for alleviating symptoms of stress, anxiety and depression and for improving psychological flexibility among adolescents who experience depressive symptoms. Methods: A total of 43 adolescents reporting elevated levels of depression symptoms who were selected from a total of 348 adolescents were randomized to receive a five-week intervention with support from a coach and/or virtual coach or to participate in the treatment-as-usual control condition. Results: The results suggest that the online intervention alleviated symptoms of depression and anxiety, while adolescents who received only the usual support from their schools reported increasing symptoms during the COVID-19 pandemic (Cohen's d = 0.70 and d = 0.66, respectively). Conclusions: The online intervention is a promising alternative to respond to the increased need for support among young people who experience ill-being. Technology-based approaches can increase the reach of evidencebased psychological support while also offering an acceptable and motivating approach to young people who may not actively seek traditional face-to-face treatment. The current results support the inclusion of online support in the services provided to young people facing mental health problems.