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Preliminary — 34/100 Other medRxiv

Prevalence, determinants, and cardiometabolic consequences of overweight and obesity among people with Down syndrome: a systematic review and meta-analysis.

medrxiv (preprint) Nambooze, R.; Pitua, I.; Bongomin, F.; Walakira, E. J.; Hove, G. V.; Schauwer, E. D.
TL;DR

ObjectiveThis systematic review and meta-analysis synthesised the global prevalence of overweight and obesity in people with Down syndrome (DS) across the lifespan, characterised determinants of excess adiposity, and examined associations with adverse cardiometabolic outcomes. MethodsSix databases were searched without date or language restriction. Two independent reviewers screened studies, extracted data, and assessed quality using the Joanna Briggs Institute Critical Appraisal Checklist for

Credibility Assessment Preliminary — 34/100
Study Design
Rigor of the research methodology
5/20
Sample Size
Whether the study was sufficiently powered
7/20
Peer Review
Review status and journal reputation
4/20
Replication
Has this finding been independently reproduced?
6/20
Transparency
Funding disclosure and data availability
12/20
Overall
Sum of all five dimensions
34/100

ObjectiveThis systematic review and meta-analysis synthesised the global prevalence of overweight and obesity in people with Down syndrome (DS) across the lifespan, characterised determinants of excess adiposity, and examined associations with adverse cardiometabolic outcomes.

MethodsSix databases were searched without date or language restriction. Two independent reviewers screened studies, extracted data, and assessed quality using the Joanna Briggs Institute Critical Appraisal Checklist for Prevalence Studies. Prevalence was pooled using a random- effects logit model. A pre-specified subgroup analysis by age band was conducted. Publication bias was assessed with Eggers test and certainty of evidence with Grading of Recommendations Assessment, Development and Evaluation (GRADE).

ResultsTwenty-six studies (7,840 individuals; 14 countries) were included. The pooled prevalence was 18% (95% CI 15-22%) in children and adolescents, 36% (95% CI 26-47%) in adults, and 30% (95% CI 20-43%) in mixed-age cohorts; the test for subgroup differences was significant ({chi}{superscript 2}{square}= 14.39, p = 0.0007). The overall pooled prevalence was 22% (95% CI 18-26%; prediction interval 7-53%; I{superscript 2} = 95.3%). No publication bias was detected (Eggers t = 0.39, p = 0.6964). DS-specific growth charts yielded estimates 14-37 percentage points lower than general-population references applied to the same cohorts. Obesity more than doubled obstructive sleep apnea risk (RR 2.4; 95% CI 1.34-4.34) and Non-alcoholic fatty liver disease was present in 82% of obese versus 45% of non-obese children with DS. GRADE certainty was Moderate for prevalence estimates.

ConclusionsOverweight and obesity in DS are highly prevalent, age-progressive, and substantially exceed general-population rates at every life stage. Roughly one in five people with DS is affected overall, rising to more than one in three adults. The reference chart applied is the single largest source of heterogeneity in reported estimates. Cardiometabolic surveillance, adapted lifestyle interventions, and primary prevalence research from low- and middle-income countries are the highest-priority gaps.

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