Evidence map›Paper›PMID 19332753›Full record

SynthesisCMAJ : Canadian Medical Association journal = journal de l'Association medicale canadienne2009

Effect of school-based physical activity interventions on body mass index in children: a meta-analysis.

Kevin C Harris, Lisa K Kuramoto, Michael Schulzer, Jennifer E Retallack

Registry-linked trialAbstract readMeta-AnalysisSystematic Review
PubMed Full text at PMC Publisher
In one paragraph

Synthesis in CMAJ : Canadian Medical Association journal = journal de l'Association medicale canadienne, 2009. The graph could read no effect estimate from its abstract, so it casts no vote on the map. It is linked to trial NCT00988754 (School Children and Adolescents as Health Experts - Step 3), which is not on this map. Cited by 158 papers, 31 of them syntheses that pooled it.

0numbers the graph read from it
0cells of the map it votes in
158citing papers in PubMed, 31 pooled it
–field-weighted citation impact
1 · What the graph read from it

What it found

Each row is one number read from the abstract, on the scale the paper reported it, with its interval. Left of the dashed line favours the treatment, right favours the comparator. Under each row is the sentence it came from. New to these charts? A ten-minute tutorial.

The abstract states no effect estimate the extractor could read, or names no intervention and outcome on the map, so this paper lights no cell and moves no belief. It is still indexed, cited and linked below.

2 · The registry

The trial behind it

Trials whose registry record cites this paper, or whose number appears in the abstract. A trial that started after this paper was published is citing it as background, not reporting it.

NCT00988754 nacompletednot on this map

School Children and Adolescents as Health Experts - Step 3

TypeinterventionalSponsorTechnical University of MunichRan2008 to 2012Enrolled595ConditionsObesity, Cardiovascular RiskArmsSchool children and adolescents as health experts
3 · Its place in the literature

Who cites it

158 citing papers in PubMed, 31 syntheses or guidelines pooled it.

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  20. What childhood obesity prevention programmes work? A systematic review and meta-analysis.Obesity reviews : an official journal of the International Association for the Study of Obesity · 2015
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98 more citing papers are in PubMed but not listed here.

4 · The record

Corrections and comments

5 · Who and what money

Authors and funding

4 authors.

Kevin C HarrisDepartment of Pediatrics, British Columbia Children's Hospital, Vancouver, BC. kharris2@cw.bc.ca
Lisa K Kuramoto
Michael Schulzer
Jennifer E Retallack

Funding

No grant is acknowledged in the PubMed record.

6 · The paper itself

Abstract

backgroundThe prevalence of childhood obesity is increasing at an alarming rate. Many local governments have enacted policies to increase physical activity in schools as a way to combat childhood obesity. We conducted a systematic review and meta-analysis to determine the effect of school-based physical activity interventions on body mass index (BMI) in children.

methodsWe searched MEDLINE, EMBASE, CINAHL and the Cochrane Central Register of Controlled Trials up to September 2008. We also hand-searched relevant journals and article reference lists. We included randomized controlled trials and controlled clinical trials that had objective data for BMI from before and after the intervention, that involved school-based physical activity interventions and that lasted for a minimum of 6 months.

resultsOf 398 potentially relevant articles that we identified, 18 studies involving 18 141 children met the inclusion criteria. The participants were primarily elementary school children. The study duration ranged from 6 months to 3 years. In 15 of these 18 studies, there was some type of co-intervention. Meta-analysis showed that BMI did not improve with physical activity interventions (weighted mean difference -0.05 kg/m(2), 95% confidence interval -0.19 to 0.10). We found no consistent changes in other measures of body composition.

interpretationSchool-based physical activity interventions did not improve BMI, although they had other beneficial health effects. Current population-based policies that mandate increased physical activity in schools are unlikely to have a significant effect on the increasing prevalence of childhood obesity.

Indexed as

Body Mass IndexDietAdolescentBody CompositionChildFemaleHealth EducationHumansMaleObesityPhysical Education and TrainingPhysical FitnessRandomized Controlled Trials as TopicRisk FactorsSchool Health ServicesSensitivity and Specificity

Identifiers

PMID19332753
PMCPMC2659836

What OpenQuestion holds

Textmetadata
Read underepoch 390

Registered trials

Read under generation 80e0d062 · epoch 390. Bibliography from PubMed, PubMed Central and OpenAlex; grants from NIH RePORTER; trial links from ClinicalTrials.gov; estimates, votes and beliefs from the OpenQuestion graph.