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Meta-Analysis
. 2014 Apr 24;9(4):e96110.
doi: 10.1371/journal.pone.0096110. eCollection 2014.

Mindfulness-based interventions for people diagnosed with a current episode of an anxiety or depressive disorder: a meta-analysis of randomised controlled trials

Clara Strauss  1 , Kate Cavanagh  2 , Annie Oliver  2 , Danelle Pettman  2
Affiliations
Meta-Analysis

Mindfulness-based interventions for people diagnosed with a current episode of an anxiety or depressive disorder: a meta-analysis of randomised controlled trials

Clara Strauss et al. PLoS One. .

Abstract

Objective: Mindfulness-based interventions (MBIs) can reduce risk of depressive relapse for people with a history of recurrent depression who are currently well. However, the cognitive, affective and motivational features of depression and anxiety might render MBIs ineffective for people experiencing current symptoms. This paper presents a meta-analysis of randomised controlled trials (RCTs) of MBIs where participants met diagnostic criteria for a current episode of an anxiety or depressive disorder.

Method: Post-intervention between-group Hedges g effect sizes were calculated using a random effects model. Moderator analyses of primary diagnosis, intervention type and control condition were conducted and publication bias was assessed.

Results: Twelve studies met inclusion criteria (n = 578). There were significant post-intervention between-group benefits of MBIs relative to control conditions on primary symptom severity (Hedges g = -0.59, 95% CI = -0.12 to -1.06). Effects were demonstrated for depressive symptom severity (Hedges g = -0.73, 95% CI = -0.09 to -1.36), but not for anxiety symptom severity (Hedges g = -0.55, 95% CI = 0.09 to -1.18), for RCTs with an inactive control (Hedges g = -1.03, 95% CI = -0.40 to -1.66), but not where there was an active control (Hedges g = 0.03, 95% CI = 0.54 to -0.48) and effects were found for MBCT (Hedges g = -0.39, 95% CI = -0.15 to -0.63) but not for MBSR (Hedges g = -0.75, 95% CI = 0.31 to -1.81).

Conclusions: This is the first meta-analysis of RCTs of MBIs where all studies included only participants who were diagnosed with a current episode of a depressive or anxiety disorder. Effects of MBIs on primary symptom severity were found for people with a current depressive disorder and it is recommended that MBIs might be considered as an intervention for this population.

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Conflict of interest statement

Competing Interests: The authors have declared that no competing interests exist.

Figures

Figure 1
Figure 1. PRISMA (2009) Flow Diagram.
Figure 2
Figure 2. Forest Plot of MBIs in comparison to control conditions on severity of primary symptom for people with depressive disorder and anxiety disorder diagnoses.
Figure 3
Figure 3. Forest Plot of the effect of MBIs in comparison to control conditions on primary symptom severity by control condition type (active versus inactive) for people with depressive disorder and anxiety disorder diagnoses.
Figure 4
Figure 4. Forest Plot of the effect of MBIs in comparison to control conditions on primary symptom severity by intervention type (MBCT versus MBSR) for people with depressive disorder and anxiety disorder diagnoses.
Figure 5
Figure 5. Forest Plot of the effect of MBIs in comparison to control conditions on depressive symptom severity for people with depressive disorder and anxiety disorder diagnoses.
Figure 6
Figure 6. Forest Plot of the effect of MBIs in comparison to control conditions on anxiety symptom severity for people with depressive disorder and anxiety disorder diagnoses.
Figure 7
Figure 7. Funnel plot of effect sizes by standard error for primary symptom severity.
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