Menstrual cycles today: how menstrual cycles vary by age, weight, race, and ethnicity – Apple Women's Health Study

November 2022: A person’s menstrual cycle length and regularity are key indicators of their overall health1. Menstrual cycles that are unusually long (more than 40 days) or are irregular have been …

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Menstrual cycle length variation by demographic characteristics from the Apple Women's Health Study

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