An umbrella review of meta-analyses of school-based Mindfulness Based Interventions (MBIs)

Objective: This umbrella review synthesised evidence from meta-analyses of school-based mindfulness-based interventions (MBIs) to evaluate effects on wellbeing, mindfulness, depression, and anxiety in children and adolescents. Methods: Searches were conducted in PubMed, PsycINFO, CINAHL, ERIC, and Cochrane databases to end 2024. Eligibility criteria included controlled trials of school-based MBIs for children and adolescents aged 5–18 yrs, and peer reviewed publication. Data extraction followed PRISMA Guidelines, with AMSTAR-2 and GRADE used to measure quality. Pooled effect sizes were analysed using random-effects models, and meta-regression analyses for moderator effects. The review protocol was pre-registered with PROSPERO. Results: Six meta-analyses, covering a total of 110 primary studies and 28,910 participants, met inclusion criteria. MBIs showed small but statistically significant effects for wellbeing (g = 0.13), mindfulness (g = 0.11), and anxiety (g = 0.11), but no effect for depression (g = 0.05). Quality of included reviews ranged from critically low to moderate (AMSTAR-2). GRADE assessments indicated very low certainty of evidence across all outcomes, primarily due to risk of bias, inconsistency, and imprecision. Limitations: Results were limited by the small number of meta-analyses included in the umbrella review ( k = 6), variation in methodological quality of primary studies, and lack of follow-up data in some meta-analyses. Conclusion: School-based MBIs are associated with very small improvements in wellbeing, mindfulness, and anxiety, but not depression, for children and adolescents in the general school population. However, the evidence is limited and inconsistent, with a need for further high-quality RCTs in this field. Registration: PROSPERO CRD42025636892