Calendar-based contraceptive methods

Rarity: Uncommon

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Notion

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Science and technology

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What Wikipedia says

Calendar-based methods are various methods of estimating a woman's likelihood of fertility, based on a record of the length of previous menstrual cycles. Various methods are known as the Knaus–Ogino method and the rhythm method.

Excerpt from the Wikipedia article “Calendar-based contraceptive methods”, under the CC BY-SA 4.0 license. Read the article on Wikipedia