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Birth-order position of the most recent men’s 100m world record holders

1. Usain Bolt (2nd of 3 children)
2. Asafa Powell (sixth of sixth)
3. Justin Gatlin (fourth of four)
4. Maurice Greene (fourth of four)
5. Donovan Bailey (third of three)
6. Leroy Burrell (fourth of five)
7. Carl Lewis (third of four)
8. Burrell (fourth of five)
9. Lewis (third of four)
10. Calvin Smith (sixth of eight)
average = 4 in families with 4.6 children

2 key underlining factors are likely to contribute to such pattern:
– Primal cues
– Later children given an advantage as testosterone increases with each birth