Background and rationale {6a}
depression, depressive, IMIs, anxiety
DISORDERS
Adolescence and young adulthood bear a heightened risk for the development of mental health disorders. For example, the first onset of mood and anxiety disorders often lies in the teenage years or early twenties [While traditional (face-to-face) psychological interventions have been shown to be effective in the prevention of mental health disorders, it is usually not feasible to deliver these interventions on a large scale. It has therefore been argued that Internet- and mobile-based interventions (IMIs) are a promising avenue to increase access to prevention programs [Prevention focusing on RNT has been highlighted as a promising strategy [Importantly, results from a growing number of clinical trials suggest that RNT is modifiable and support the usefulness of focusing on RNT in the prevention and treatment of mental health disorders. For example, rumination-focused cognitive-behavioral therapy (RFCBT) [A series of randomized controlled trials have provided evidence for the effectiveness of RFCBT in reducing RNT and depressive symptoms as well as preventing relapse in adults and adolescents with a history of depression [The current trial is based on these prior studies [