Background
Mindfulness based interventions (
MBI
s) are an increasingly popular way of attempting to improve the behavioural, cognitive and mental health outcomes of children and adolescents, though there is a suggestion that enthusiasm has moved ahead of the evidence base. Most evaluations of
MBI
s are either uncontrolled or nonrandomized trials. This meta‐analysis aims to establish the efficacy of
MBI
s for children and adolescents in studies that have adopted a randomized, controlled trial (
RCT
) design.
Methods
A systematic literature search of
RCT
s of
MBI
s was conducted up to October 2017. Thirty‐three independent studies including 3,666 children and adolescents were included in random effects meta‐analyses with outcome measures categorized into cognitive, behavioural and emotional factors. Separate random effects meta‐analyses were completed for the seventeen studies (
n
= 1,762) that used an
RCT
design with an active control condition.
Results
Across all
RCT
s we found significant positive effects of
MBI
s, relative to controls, for the outcome categories of Mindfulness, Executive Functioning, Attention, Depression, Anxiety/Stress and Negative Behaviours, with small effect sizes (Cohen's
d
), ranging from .16 to .30. However, when considering only those
RCT
s with active control groups, significant benefits of an
MBI
were restricted to the outcomes of Mindfulness (
d
=
.42), Depression (
d
=
.47) and Anxiety/Stress (
d
=
.18) only.
Conclusions
This meta‐analysis reinforces the efficacy of using
MBI
s for improving the mental health and wellbeing of youth as assessed using the gold standard
RCT
methodology. Future
RCT
evaluations should incorporate scaled‐up definitive trial designs to further evaluate the robustness of
MBI
s in youth, with an embedded focus on mechanisms of action.