Evidence map›Paper›PMID 32059000›Full record

ArticlePloS one2020

Relative age effects in Elite Chinese soccer players: Implications of the 'one-child' policy.

Zhen Li, Lijuan Mao, Christina Steingröver, Nick Wattie, Joseph Baker, Jörg Schorer, Werner F Helsen

Abstract read
In one paragraph

Article in PloS one, 2020. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 9 papers.

0numbers the graph read from it
0cells of the map it votes in
9citing papers in PubMed
–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.

Neither the registry nor the abstract names a trial number. If this is a trial report, that itself is worth knowing.

3 · Its place in the literature

Who cites it

9 citing papers in PubMed.

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4 · The record

Corrections and comments

PubMed lists nothing against this paper. Absence here is not a guarantee, only a check that was made.

5 · Who and what money

Authors and funding

7 authors.

Zhen LiDepartment of Physical Education and Sports Training, Shanghai University of Sport, Shanghai, China.ORCID 0000-0002-7402-3809
Lijuan MaoDepartment of Physical Education and Sports Training, Shanghai University of Sport, Shanghai, China.
Christina SteingröverDepartment of Sport and Motion, Institute of Sport Science, University of Oldenburg, Oldenburg, Germany.
Nick WattieFaculty of Health Sciences, University of Ontario Institute of Technology, Oshawa, ON, Canada.
Joseph BakerSchool of Kinesiology and Health Science, York University, Toronto, ON, Canada.
Jörg SchorerDepartment of Sport and Motion, Institute of Sport Science, University of Oldenburg, Oldenburg, Germany.
Werner F HelsenResearch Centre for Movement Control and Neuroplasticity, Department of Movement Sciences, KU Leuven, Leuven, Belgium.

Funding

No grant is acknowledged in the PubMed record.

6 · The paper itself

Abstract

The relative age effect (RAE) refers to the asymmetrical distribution of birthdates in a cohort found in many achievement domains, particularly in sports with many participants like soccer. Given the uniqueness of the one-child policy in China, this study examined the existence of the RAE in elite Chinese male and female soccer players generally and relative to their playing position on the field. Results showed a clear and obvious RAE for all age groups (U20 male, U18 male, adult female and U18 female) with the observed birthdate distributions for each age group significantly different from expected distributions (p<0.05). Additionally, we noticed a differential RAE according to the players' position on the field as reflected in different effect sizes. In male players, the RAE was significantly greater in Defenders (DF) and Goalkeepers (GK) compared to Midfielders (MF) and Forwards (FW) (VDF = 0.266>VGK = 0.215>VMF = 0.178>VFW = 0.175). In female players, GKs had a larger RAE (VGK = 0.184>0.17, VDF = 0.143, VMF = 0.127, VFW = 0.116). To reduce the negative consequences associated with RAEs throughout player development systems, potential solutions are discussed.

Indexed as

Age DistributionAdolescentAthletesChinaFemaleGovernment ProgramsHumansMalePopulation ControlSoccerYoung Adult

Identifiers

PMID32059000
PMCPMC7021294

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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.