From the link you posted. This might have something to do with the baseball side.Yeah I understand that, and it seems to manifest itself in the Hockey numbers, as that was the example used in Gladwell's book.
However, we see the Baseball numbers show a high proportion of Sept-Dec birthdays (older kids in the grade). Is there something different about baseball? Do they go to grade level sooner? Does the existence of middle school baseball teams give an advantage to the older kids in those grades?
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Notes: Little League baseball’s birthday cutoff was August 1 when this cohort of players entered that system, but changed to May 1 several years ago. 2011-12 NCAA Division I first-year student-athletes compared to population birthday data from Centers for Disease Control (CDC) for all 1993 U.S. births (similar age as student-athletes in this analysis).