Relative Age Effects Across and Within Female Sport Contexts: A Systematic Review and Meta-Analysis

  • Kristy L. Smith
  • Patricia L. Weir
  • Kevin Till
  • Michael Romann
  • Stephen Cobley
Systematic Review

Abstract

Background

Subtle differences in chronological age within sport (bi-) annual-age groupings can contribute to immediate participation and long-term attainment discrepancies; known as the relative age effect. Voluminous studies have examined relative age effects in male sport; however, their prevalence and context-specific magnitude in female sport remain undetermined.

Objective

The objective of this study was to determine the prevalence and magnitude of relative age effects in female sport via examination of published data spanning 1984–2016.

Methods

Registered with PROSPERO (No. 42016053497) and using Preferred Reporting Items for Systematic Reviews and Meta-analysis systematic search guidelines, 57 studies were identified, containing 308 independent samples across 25 sports. Distribution data were synthesised using odds ratio meta-analyses, applying an invariance random-effects model. Follow-up subgroup category analyses examined whether relative age effect magnitudes were moderated by age group, competition level, sport type, sport context and study quality.

Results

When comparing the relatively oldest (quartile 1) vs. youngest (quartile 4) individuals across all female sport contexts, the overall pooled estimate identified a significant but small relative age effect (odds ratio = 1.25; 95% confidence interval 1.21–1.30; p = 0.01; odds ratio adjusted = 1.21). Subgroup analyses revealed the relative age effect magnitude was higher in pre-adolescent (≤ 11 years) and adolescent (12–14 years) age groups and at higher competition levels. Relative age effect magnitudes were higher in team-based and individual sport contexts associated with high physiological demands.

Conclusion

The findings highlight relative age effects are prevalent across the female sport contexts examined. Relative age effect magnitude is moderated by interactions between developmental stages, competition level and sport context demands. Modifications to sport policy, organisational and athlete development system structure, as well as practitioner intervention are recommended to prevent relative age effect-related participation and longer term attainment inequalities.

Notes

Acknowledgements

Support for this study was received from a Social Sciences and Humanities Research Council Doctoral Fellowship (K. Smith). The authors would also like to thank Kanchana Ekanayake (The University of Sydney), Allan Fu (The University of Sydney) and Trish Dubé (University of Windsor) for their assistance.

Compliance with Ethical Standards

Funding

No funding was received for the preparation of this article.

Conflict of interest

Kristy Smith, Patricia Weir, Kevin Till, Michael Romann and Stephen Cobley have no conflicts of interest directly relevant to the content of this article.

Supplementary material

40279_2018_890_MOESM1_ESM.docx (33 kb)
Supplementary material 1 (DOCX 33 kb)
40279_2018_890_MOESM2_ESM.docx (38 kb)
Supplementary material 2 (DOCX 38 kb)
40279_2018_890_MOESM3_ESM.docx (28 kb)
Supplementary material 3 (DOCX 27 kb)

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Copyright information

© Springer International Publishing AG, part of Springer Nature 2018
corrected publication April/2018

Authors and Affiliations

  1. 1.Faculty of Human KineticsUniversity of WindsorWindsorCanada
  2. 2.Institute for Sport, Physical Activity and LeisureLeeds Beckett UniversityLeedsUK
  3. 3.Swiss Federal Institute of Sport MagglingenMagglingenSwitzerland
  4. 4.Exercise and Sport Sciences, Faculty of Health SciencesThe University of Sydney, Cumberland CampusSydneyAustralia

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