Effectiveness of a transdiagnostic emotion regulation training in an at-risk sample: a randomized-controlled trial of group-based training versus self-help bibliotherapy.

Objectives: Subclinical psychotic, depression, and anxiety symptoms form a transdiagnostic 'at-risk state' for the development of mental disorders. Emotion regulation has been identified as a transdiagnostic factor relevant to the formation of these symptoms that can be successfully addressed in clinical interventions. Here, we tested whether a group-based emotion regulation training would be effective in reducing distress and at preventing the transition to mental disorders in an at-risk sample.

Methods: Participants with distressing subclinical psychotic, depression, or anxiety symptoms (n = 138) were randomly allocated to either the 8-week group-based affect regulation training (ART; Springer, New York) or an 8-week self-help bibliotherapy (BT). They underwent biweekly measurements during the intervention, as well as at a six- and 12-month follow-up. In an exploratory analysis, we tested whether the ART would be superior to BT in preventing the transition to any mental disorder at 12-month follow-up. We also tested for differences in trajectories of psychopathology and emotion regulation (via questionnaires) and emotion regulation in daily life (via the experience-sampling method).

Results: Participants in the ART condition showed a greater improvement of emotion regulation in daily life than those with BT, but the ART was not superior over BT in preventing the transition to mental disorders. There were significant longitudinal reductions from pre- to post-intervention for general psychopathology and symptoms but no superiority of the ART over BT.

Conclusions: Despite its efficacy in improving emotion regulation skills, the ART does not produce effects on psychopathology that justify its recommendation over self-help approaches.