Study shows mean age of first period decreased from 12.5 to 11.9 years, with more starting before 11 and fewer after 16. Irregularities increased over time, impacting health outcomes.
Early periods linked to risks like cardiovascular diseases, cancers, and premature death; delayed regularity tied to fertility issues and metabolic conditions. Impact affects all racial groups.
Black and Hispanic participants had earlier periods than white and Asian participants. Black individuals had a larger shift towards earlier periods, compounding health risks over time.
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