Table 1.
Percentage of players born in each of the four quarters (Q) of the year along each category.
Odds ratios (OR) (and 95% confidence intervals) are shown, examining birth-date distributions in relation to Q4 for each age-category (U14, U16, U18) and overall (Total).
Fig 1.
Differences in the birth-date distributions between the general population and our sample is shown in this figure.
The zero value corresponds to the Spanish population’s birth-date distribution for each age-category, and overall. Thus, positive values indicate over-representation of players born at the quarter, whereas negative values indicate under-representation of players born at the quarter, compared to the population’s birth-date distribution. Abbreviations: U14 = under 14 age-category; U16 = under 16 age-category; U18 = under 18 age-category; Q = quarter of the year.
Fig 2.
Scatterplot for RAE frequency by week.
The black line represents the best fit of the Poisson regression.
Table 2.
Relative Age Effect (RAE) according to the Poisson regression analysis for the overall sample.
Table 3.
Quarterly distribution for the finally selected and non-selected soccer players, as well as for the promoted and non-promoted players.
Table 4.
Anthropometry, body composition, somatotype and physical performance of the selected and non-selected soccer players in along each age-category.
Table 5.
Anthropometry, body composition, somatotype and physical performance of the promoted and non-promoted soccer players in along each age-category.