A Meta-Analysis of the Efficacy of Acceptance and Commitment Therapy for Clinically Relevant Mental and Physical Health Problems

By J. A-Tjak, Michelle L Davis, N. Morina, Mark B. Powers, Jasper A. J. Smits, Paul G. M. Emmelkamp. Psychotherapy and Psychosomatics, 2014

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The role of psychological flexibility in the context of COVID-19: Associations with depression, anxiety, and insomnia (2021, background): “psychology treatments, and interventions derived from it appear effective (A-Tjak et al., 2015).”
The Acceptance and Action Questionnaire-II (AAQ-II) as a measure of experiential avoidance: Concerns over discriminant validity (2019, background): “Indeed, there is widespread evidence for the efficacy of ACT based interventions across a wide range of psychological disorders (e.g., A-Tjak et al., 2015; Powers, Zum Vörde Sive Vording, & Emmelkamp, 2009).”
Effectiveness of online mindfulness-based interventions in improving mental health: A review and meta-analysis of randomised controlled trials. (2016, background): “…al., 2010; Hofmann et al., 2010; Klainin-Yobas et al., 2012; Powers, Zum Vörde Sive Vörding, & Emmelkamp, 2009; Strauss et al., 2014; Veehof et al., 2011), there are also meta-analyses which indicate that higher quality studies yield smaller effect sizes (A-Tjak et al., 2015; Khoury et al., 2013).”