Mapping menstrual health and hygiene progress in US schools: a systematic policy review and comparison across states.

Front Reprod Health · 2025 · PMC12405391 · PMID 40908977

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a significant trendno p-value reported

Research shows a significant trend toward earlier menarche over the past 50–100 years, with the prevalence of early menarche (before age 11) and very early menarche (before age 9) nearly doubling across birth years from 1950 to 2005.

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