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Relative age effects in Australian Football League national draftees

(2014) JOURNAL OF SPORTS SCIENCES. 32(7). p.623-628
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Abstract
This study examined the birth distribution for adolescent (i.e. <20 years) and mature age players (i.e. >= 20 years) selected in the Australian Football League (AFL) National Draft between 2001 and 2012. Birth-date information was accessed for all first time AFL national draftees and players were then classified as either adolescent (N=736) or mature age (N=70) draftees. Chi-squared analysis showed a clear bias in the birth distribution of adolescent draftees towards players born in the first part of the classification period for both quartile (P<0.001) and half-year (P<0.001) compared to the Australian national population. There was a reverse relative age effect (RAE) for mature age draftees, with a significant bias towards players born in the latter part of the selection period for both quartile (P=0.047) and half-year (P=0.028) compared to the Australian national population. The selection bias towards relatively older players in adolescent AFL draftees may be related to advanced physical and psychological maturity, and exposure to higher-level coaching compared to their younger counterparts. The reverse RAE in mature age draftees is a novel finding and supports the need for strategies to encourage continued participation pathways for talented Australian football players born later in the selection year.
Keywords
development, selection bias, talent, recruitment, SOCCER PLAYERS, YOUTH SOCCER, TEAM SPORTS, BIRTH-DATE, SUCCESS, COMPETITION, PERFORMANCE, HOCKEY, BIAS

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Chicago
Coutts, Aaron J, Thomas Kempton, and Roel Vaeyens. 2014. “Relative Age Effects in Australian Football League National Draftees.” Journal of Sports Sciences 32 (7): 623–628.
APA
Coutts, A. J., Kempton, T., & Vaeyens, R. (2014). Relative age effects in Australian Football League national draftees. JOURNAL OF SPORTS SCIENCES, 32(7), 623–628.
Vancouver
1.
Coutts AJ, Kempton T, Vaeyens R. Relative age effects in Australian Football League national draftees. JOURNAL OF SPORTS SCIENCES. 2014;32(7):623–8.
MLA
Coutts, Aaron J, Thomas Kempton, and Roel Vaeyens. “Relative Age Effects in Australian Football League National Draftees.” JOURNAL OF SPORTS SCIENCES 32.7 (2014): 623–628. Print.
@article{4252874,
  abstract     = {This study examined the birth distribution for adolescent (i.e. {\textlangle}20 years) and mature age players (i.e. {\textrangle}= 20 years) selected in the Australian Football League (AFL) National Draft between 2001 and 2012. Birth-date information was accessed for all first time AFL national draftees and players were then classified as either adolescent (N=736) or mature age (N=70) draftees. Chi-squared analysis showed a clear bias in the birth distribution of adolescent draftees towards players born in the first part of the classification period for both quartile (P{\textlangle}0.001) and half-year (P{\textlangle}0.001) compared to the Australian national population. There was a reverse relative age effect (RAE) for mature age draftees, with a significant bias towards players born in the latter part of the selection period for both quartile (P=0.047) and half-year (P=0.028) compared to the Australian national population. The selection bias towards relatively older players in adolescent AFL draftees may be related to advanced physical and psychological maturity, and exposure to higher-level coaching compared to their younger counterparts. The reverse RAE in mature age draftees is a novel finding and supports the need for strategies to encourage continued participation pathways for talented Australian football players born later in the selection year.},
  author       = {Coutts, Aaron J and Kempton, Thomas and Vaeyens, Roel},
  issn         = {0264-0414},
  journal      = {JOURNAL OF SPORTS SCIENCES},
  keyword      = {development,selection bias,talent,recruitment,SOCCER PLAYERS,YOUTH SOCCER,TEAM SPORTS,BIRTH-DATE,SUCCESS,COMPETITION,PERFORMANCE,HOCKEY,BIAS},
  language     = {eng},
  number       = {7},
  pages        = {623--628},
  title        = {Relative age effects in Australian Football League national draftees},
  url          = {http://dx.doi.org/10.1080/02640414.2013.847277},
  volume       = {32},
  year         = {2014},
}

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