Efficacy of an early intervention based on acceptance and commitment therapy for adults with depressive symptomatology: Evaluation in a randomized controlled trial

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APA Citation: 

Bohlmeijer, E. T., Fledderus, M., Rokx, T. A. J. J., & Pieterse, M. E. (2011). Efficacy of an Early Intervention Based on Acceptance and Commitment Therapy for Adults with Depressive Symptomatology: Evaluation in a Randomized Controlled Trial. Behaviour Research and Therapy, 49, 62-67.

Publication Topic: 
ACT: Empirical
Publication Type: 
Acceptance and commitment therapy, depression, randomized controlle trail, experiential avoidance

Objective: The current study examined the efficacy of an early intervention based on acceptance and
commitment therapy (ACT) for depressive symptomatology. The ACT intervention is aimed at increasing
the acceptance of negative thoughts and emotions and living a mindful and value-based life.

Method: Adults with mild to moderate depressive symptomatology were randomly assigned to the ACT
intervention (n ¼ 49) or to a waiting list (n ¼ 44). The mean age of the participants was 49 years. The
majority of the participants was female and of Dutch origin. All the participants completed measures
before and after the intervention, as well as three months later at follow-up to assess depression (CES-D),
anxiety (HADS-A), fatigue (CIS), alcohol use and acceptance (AAQ-II).

Results: The ACT intervention led to statistically significant reduction in depressive symptomatology
(Cohen’s d ¼ .60). These reductions were maintained at the three-month follow-up. Also significant
reductions in anxiety and fatigue were observed. Moreover, mediational analysis showed that the
improvement of acceptance during the intervention mediated the effects of the intervention on
depressive symptomatology at follow-up.

Conclusion: These findings suggest that an early intervention based on ACT, aimed at increasing acceptance,
is effective in reducing depressive symptomatology.

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