Relative Age Effect spotted in Australia...and why it matters

From the blog Sports are 80 Percent Mental

http://blog.80percentmental.com/2010/02/month-of-birth-determines-success-in.html

Here it is again....

The month of your birth influences your chances of becoming a professional sportsperson, an Australian researcher has found. Senior research fellow Dr. Adrian Barnett from Queensland University of Technology's Institute of Health and Biomedical Innovation studies the seasonal patterns of population health and found the month you were born in could influence your future health and fitness.

The results of the study are published in the book Analysing Seasonal Health Data, by Barnett, co-authored by researcher Professor Annette Dobson from the University of Queensland.
Barnett analysed the birthdays of professional Australian Football League (AFL) players and found a disproportionate number had their birthdays in the early months of the year, while many fewer were born in the later months, especially December.

The Australian school year begins in January. "Children who are taller have an obvious advantage when playing the football code of AFL," Dr. Barnett said. "If you were born in January, you have almost 12 months' growth ahead of your classmates born late in the year, so whether you were born on December 31st or January 1st could have a huge effect on your life."

...and why it matters.

"Research in the UK shows those born at the start of the school year also do better academically and have more confidence," he said. "And with physical activity being so important, it could also mean smaller children get disheartened and play less sport. If smaller children are missing out on sporting activity then this has potentially serious consequences for their health in adulthood."

Dr. Barnett said this seasonal pattern could also result in wasted talent, with potential sports stars not being identified because they were competing against children who were much more physically advanced than them. He said a possible solution was for one of the sporting codes in Australia to change the team entry date from January 1st to July 1st.

I don't believe that the solution is as easy moving the birth date for the various youth leagues. Maybe part of the answer is to group teams more by size, as I believe youth football does.

Over here in the states, the travel/elite leagues are applying a form of self-selected, early identification system that removes some of the early achievers form the pool of late bloomers. I'm not sure that is the optimal system to have in place, but we are where we are.