Meditation programs for psychological stress and well-being: a systematic review and meta-analysis.
Level 1 - systematic review of randomized trials
Systematic review and meta-analysis of randomized controlled trials
PubMed 24395196 · doi:10.1001/jamainternmed.2013.13018
What was done
Systematic review and meta-analysis of randomized clinical trials evaluating meditation programs for stress-related outcomes in adult clinical populations, published through November 2012 across MEDLINE, PsycINFO, EMBASE, Cochrane Library, and other databases. Only trials with active control groups to account for placebo effects were included. Two independent reviewers extracted data and graded evidence across risk of bias, precision, directness, and consistency domains. Aggregate effect sizes were calculated as standardized mean differences with 95% confidence intervals.
What was found
Across 47 included trials (n = 3,515 participants), mindfulness meditation programs yielded moderate-strength evidence for reductions in anxiety (effect size 0.38 [95% CI, 0.12-0.64] at 8 weeks; 0.22 [95% CI, 0.02-0.43] at 3-6 months), depression (effect size 0.30 [95% CI, 0.00-0.59] at 8 weeks; 0.23 [95% CI, 0.05-0.42] at 3-6 months), and pain (effect size 0.33 [95% CI, 0.03-0.62]). Low-strength evidence was found for improved stress/distress and mental health-related quality of life. There was low evidence of no effect or insufficient evidence of effect on positive mood, attention, substance use, eating habits, sleep, and weight. Meditation programs were not superior to other active treatments (such as pharmacotherapy, exercise, or other behavioral therapies).
Why it matters
This review shows that mindfulness meditation offers modest symptom relief for anxiety, depression, and pain comparable to established active therapies, providing clinicians with evidence-based guidance for patient counseling.
Limits
Effects were small to moderate and restricted to negative dimensions of psychological stress; evidence was insufficient or negative for positive well-being and health behaviors (such as sleep, weight, and substance use). Most trials evaluated short durations (8 weeks to 6 months), and meditation did not outperform other active therapeutic interventions.