2020, Volume 12, Issue 2
The relative age effect in FIFA U-17 World Cup: The role of the playing position and the continent
Ali Işın1, Tuba Melekoğlu1
1Department of Coaching Education, Faculty of Sport Sciences, Akdeniz University
Author for correspondence: Ali Işın; Department of Coaching Education, Faculty of Sport Sciences, Akdeniz University; email: isin_ali@ hotmail.com
Background: The aim of this study was to examine the relative age effect of the countries which attended the 2017 FIFA U-17 World Cup and to research the relative age effect in terms of continents and the players’ position.
Material and methods: 504 male football players from 24 countries which participated in the U-17 World Cup in India in 2017 were included in the study. Football players’ dates of birth were grouped into periods of three months in quarter years (Q): Q1 – January-March, Q2 – April-June, Q3 – July-September, Q4 – October-December. To study the sub-group differences of the relative age effect, meaningful chi-square (χ²) values were
followed by calculating the odds ratio and %95 confidence intervals. To determine the effect size, Cramer’s V was used.
Results: The relative age effect was based on quarter years’ distributions. Significant differences were found among age quartiles for all teams in FIFA U-17 World Cup. However, when the variables analysed were according to the continents, the relative age effect disappeared in Africa, Asia and Oceania.
Conclusions: In the comparison of the players’ continents, a relative age effect was observed in Europe, North America, and South America. When the players’ positions are compared, a relative age effect was found in defenders, midfielders and forward players.
Key words: relative age effect, football, continent, World Cup, playing position