What led psychologist Roger Barnsley to conclude that being born early in the year might contribute to success in sports?

Answer 1

Roger Barnsley concluded that being born early in the year might contribute to success in sports after conducting a study of over 1,000 professional soccer players in England. He found that players born in the first three months of the year were more likely to be successful than those born later in the year. This was due to the fact that players born earlier in the year were more likely to be physically mature than those born later in the year, giving them an advantage in terms of physical development.