Tropical regions are also relatively poorer, compared to more northern countries. And poverty during childhood is related to earlier puberty [1]. [1] https://i

Tropical regions are also relatively poorer, compared to more northern countries. And poverty during childhood is related to earlier puberty [1]. [1] https://ifstudies.org/blog/poverty-and-early-puberty-in-australian-children https://ifstudies.org/blog/poverty-and-early-puberty-in-aust... So, there is another way to explain what we see.