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US girls got their first periods increasingly earlier over the last 50 years, new study finds (www.theguardian.com)

submitted 5 months ago by [email protected] to c/[email protected]

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Trend is especially pronounced among Black, Hispanic and Asian participants, and those who report lower socioeconomic status

Girls in the United States had their first periods earlier over the last five decades and it took longer to experience regular cycles, a new study has found.

The study, published in JAMA Network Open, found the trend is especially pronounced among Black, Hispanic, Asian and mixed race participants, and among those who reported lower socioeconomic status.

“This is important because early menarche,” or a first period, “and irregular periods can signal physical and psychosocial problems later in life,” said Zifan Wang, a postdoctoral research fellow at Harvard University’s TH Chan School of Public Health and lead author of the study.

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[–] [email protected] 2 points 5 months ago* (last edited 5 months ago)

You don't just get to make an assertive claim without supporting evidence, even if it's in contradiction of another assertive claim. That which can be asserted without evidence (like the opinion you express here, supported by the merest incredulity) can be dismissed without evidence (like everyone here is doing of your opinion).

If you want to contradict the claim made without asserting your own claim contrary to, you must actually address the evidences for that claim, undermining, subverting, proving them false. This, successfully done, would lead an outside skeptic to the null hypothesis of "I don't know," rather than your frankly misogynistic hypothesis of, paraphrasing, "women don't know what they're talking about."