Effectiveness of a guided multicomponent internet and mobile gratitude training program - A pragmatic randomized controlled trial

Objective: To investigate the effectiveness of a guided, internet- and smartphone-based gratitude intervention on the transdiagnostic risk-factor ‘repetitive negative thinking’. The multicomponent intervention integrates a variety of gratitude exercises, targeting the cognitive, emotional and behavioural facets of gratitude. Method: Two hundred adults with pronounced repetitive negative thinking were recruited from the general population. Participants were randomly assigned to either a four-session guided gratitude intervention (n = 100) or waiting list (n = 100). The primary outcome was repetitive negative thinking three months after randomization, with exploratory assessments at six weeks and six months, the latter just for participants in the intervention group. Results: Following the intention-to-treat principle, by analyses of covariance (ANCOVA), the gratitude intervention group exhibited significantly lower levels of repetitive negative thinking than controls at three months, with d = 0.66, 95 % CI [0.37, 0.94] maintained at six-month follow-up. Significant and meaningful beneficial effects were observed in symptoms of depression (d = 0.42) and generalized anxiety (d = 0.38). These effects were notably stronger in intervention completers who finished at least three sessions.