Mindfulness-based stress reduction and mindfulness-based cognitive therapy for psychological health and well-being in nonclinical samples: A systematic review and meta-analysis.

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Much of the burden associated with poor mental health is associated with symptom experience in the general population. We conducted a systematic review and meta-analysis of studies conducted in non-clinical samples, evaluating Mindfulness-Based Programs (MBPs) for outcomes related to psychological health and well-being. We focussed on Mindfulness-Based Stress Reduction (MBSR) and Mindfulness-Based Cognitive Therapy (MBCT) because they have the strongest evidence base. We searched MEDLINE, PsycINFO, EMBASE and CINAHL (2006 – February, 2019) for published peer-reviewed journals articles of intervention studies evaluating MBCT or MBSR for psychological health and well-being in non-clinical samples. Data were pooled using a random-effects model and effect estimates were reported as Hedges’ g. We included 49 studies conducted in non-clinical samples (n=4733). When compared to a passive control, MBPs significantly reduced symptoms of rumination/worry (g=-1.13, [-2.17, -0.08]), stress/psychological distress (g=-0.52 [-0.68, -0.36]), depression [g=-0.45 [-0.64, -0.26]), and anxiety (g=-0.44 [-0.65, -0.23]); and significantly improved quality of life/well-being (g=0.32 [0.10, 0.54]). In general, MBCT generated larger effect sizes than MBSR for all outcomes. This study provides evidence that in non-clinical samples, MBPs are associated with benefits to health and well-being. These findings add to the growing evidence-base suggesting that MBSR and MBCT may be effective approaches for sub-clinical levels of mental ill-health and could form part of the public mental health agenda.