TY - JOUR T1 - School-based mindfulness training in early adolescence: what works, for whom and how in the MYRIAD trial? JF - Evidence Based Mental Health JO - Evid Based Ment Health SP - 117 LP - 124 DO - 10.1136/ebmental-2022-300439 VL - 25 IS - 3 AU - Jesus Montero-Marin AU - Matthew Allwood AU - Susan Ball AU - Catherine Crane AU - Katherine De Wilde AU - Verena Hinze AU - Benjamin Jones AU - Liz Lord AU - Elizabeth Nuthall AU - Anam Raja AU - Laura Taylor AU - Kate Tudor AU - MYRIAD Team AU - Sarah-Jayne Blakemore AU - Sarah Byford AU - Tim Dalgleish AU - Tamsin Ford AU - Mark T Greenberg AU - Obioha C Ukoumunne AU - J Mark G Williams AU - Willem Kuyken Y1 - 2022/08/01 UR - http://mentalhealth.bmj.com//content/25/3/117.abstract N2 - Background Preventing mental health problems in early adolescence is a priority. School-based mindfulness training (SBMT) is an approach with mixed evidence.Objectives To explore for whom SBMT does/does not work and what influences outcomes.Methods The My Resilience in Adolescence was a parallel-group, cluster randomised controlled trial (K=84 secondary schools; n=8376 students, age: 11–13) recruiting schools that provided standard social–emotional learning. Schools were randomised 1:1 to continue this provision (control/teaching as usual (TAU)), and/or to offer SBMT (‘.b’ (intervention)). Risk of depression, social–emotional–behavioural functioning and well-being were measured at baseline, preintervention, post intervention and 1 year follow-up. Hypothesised moderators, implementation factors and mediators were analysed using mixed effects linear regressions, instrumental variable methods and path analysis.Findings SBMT versus TAU resulted in worse scores on risk of depression and well-being in students at risk of mental health problems both at post intervention and 1-year follow-up, but differences were small and not clinically relevant. Higher dose and reach were associated with worse social–emotional–behavioural functioning at postintervention. No implementation factors were associated with outcomes at 1-year follow-up. Pregains−postgains in mindfulness skills and executive function predicted better outcomes at 1-year follow-up, but the SBMT was unsuccessful to teach these skills with clinical relevance.SBMT as delivered in this trial is not indicated as a universal intervention. Moreover, it may be contraindicated for students with existing/emerging mental health symptoms.Clinical implications Universal SBMT is not recommended in this format in early adolescence. Future research should explore social−emotional learning programmes adapted to the unique needs of young people.Data are available upon reasonable request. The data and codebook from the MYRIAD Trial are available from Prof Kuyken (willem.kuyken@psych.ox.ac.uk) upon request (release of data is subject to an approved proposal and a signed data access agreement). ER -