How do mindfulness-based cognitive therapy and mindfulness-based stress reduction improve mental health and wellbeing? A systematic review and meta-analysis of mediation studies

Given the extensive evidence base for the efficacy of mindfulness-based stress reduction (MBSR) and mindfulness-based cognitive therapy (MBCT), researchers have started to explore the mechanisms underlying their therapeutic effects on psychological outcomes, using methods of mediation analysis. No k...

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Veröffentlicht in:Clinical psychology review 2015-04, Vol.37, p.1-12
Hauptverfasser: Gu, Jenny, Strauss, Clara, Bond, Rod, Cavanagh, Kate
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description Given the extensive evidence base for the efficacy of mindfulness-based stress reduction (MBSR) and mindfulness-based cognitive therapy (MBCT), researchers have started to explore the mechanisms underlying their therapeutic effects on psychological outcomes, using methods of mediation analysis. No known studies have systematically reviewed and statistically integrated mediation studies in this field. The present study aimed to systematically review mediation studies in the literature on mindfulness-based interventions (MBIs), to identify potential psychological mechanisms underlying MBCT and MBSR's effects on psychological functioning and wellbeing, and evaluate the strength and consistency of evidence for each mechanism. For the identified mechanisms with sufficient evidence, quantitative synthesis using two-stage meta-analytic structural equation modelling (TSSEM) was used to examine whether these mechanisms mediate the impact of MBIs on clinical outcomes. This review identified strong, consistent evidence for cognitive and emotional reactivity, moderate and consistent evidence for mindfulness, rumination, and worry, and preliminary but insufficient evidence for self-compassion and psychological flexibility as mechanisms underlying MBIs. TSSEM demonstrated evidence for mindfulness, rumination and worry as significant mediators of the effects of MBIs on mental health outcomes. Most reviewed mediation studies have several key methodological shortcomings which preclude robust conclusions regarding mediation. However, they provide important groundwork on which future studies could build. •We systematically review mediation studies on mechanisms of MBCT and MBSR.•We statistically integrate mediation data using two-stage structural equation modelling.•Strong consistent evidence for reactivity as a mechanism of MBCT and MBSR•Moderate consistent evidence for mindfulness, rumination and worry as mechanisms•Mindfulness, rumination and worry are significant mediators for clinical outcomes.
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subjects Cognitive Behavioral Therapy
Humans
Mechanisms
Mediation
Mental Health
Meta-analysis
Mindfulness
Stress, Psychological - prevention & control
Stress, Psychological - therapy
Structural equation modelling
Treatment Outcome
title How do mindfulness-based cognitive therapy and mindfulness-based stress reduction improve mental health and wellbeing? A systematic review and meta-analysis of mediation studies
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