RAEs are consistently prevalent across sports but with small effect sizes¶
Claim · All claims
Evidence · 1 study · quant-synthesisr?·q3
Currency · newest study 2009 · not yet checked against its sources · not reviewed by a person · overdue for a recheck since 2014: baselines and conditions change
Subclaims¶
Reading the evidence codes
q is the design tier, i the impact, n the sample, and the kind with its r
the rigour judged within that kind: what each code means.
This claim: no standardized effect is recorded in observations/ for it yet, so no benchmark reading is possible.
q3 i? A meta-analysis of 38 studies found consistent prevalence of RAEs across sports, with small effect sizes. → Cobley 2009
Evidence¶
Cobley 2009¶
Cobley, S., Baker, J., Wattie, N., McKenna, J. (2009). Annual Age-Grouping and Athlete Development. Sports Med 39, 235–256. https://doi.org/10.2165/00007256-200939030-00005
q3 · i? · quant-synthesis · r?
Meta-analytical review combining 38 studies and 253 independent samples with odds ratios and random-effects procedures. The synthesis found "consistent prevalence of RAEs, but with small effect sizes"; no pooled effect size value is printed in the available text.
"A total of 38 studies, spanning 1984–2007, containing 253 independent samples across 14 sports and 16 countries were re-examined and included in a single analysis using odds ratios and random effects procedures for combining study estimates. Overall results identified consistent prevalence of RAEs, but with small effect sizes."
Discussion¶
Related Claims¶
- RAE effect size increases linearly with relative age differences — related
- Age category, skill level and sport context moderate RAE magnitude — related
- Adolescent males at representative level in highly popular sports are most at risk of RAE inequalities — a narrower finding that bears on this claim
- RAE mechanisms and generalization to female and culturally diverse contexts remain unconfirmed research needs — related
Page metadata
| Field | Value |
|---|---|
type |
claim |
id |
rae-consistent-prevalence-small-effect-sizes |
title |
RAEs are consistently prevalent across sports but with small effect sizes |
description |
RAEs are consistently prevalent across sports but with small effect sizes |
status |
review |
evidence_strength |
moderate |
newest_evidence |
2009 |
recheck_by |
2014 |
generated |
by process:wiki-ingest on 2026-10-14 |
trust |
unverified — no one has confirmed this page's content |
sources |
1 — cobley-2009 |
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