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These methods may be used to achieve pregnancy by timing unprotected intercourse for days identified as fertile, or to avoid pregnancy by avoiding unprotected intercourse during fertile days. The first formalized calendar-based method was developed in 1930 by John Smulders, a Catholic physician from the Netherlands.
A median of 288 days (274 days from the date of ovulation) for first-time mothers and 283 days (269 days from the date of ovulation) for mothers with at least one previous pregnancy was found by a 1990 study of 114 white, private-care patients with uncomplicated pregnancies and spontaneous labor. The authors suggest that excluding pregnancies ...
In the 1930s, Reverend Wilhelm Hillebrand, a Catholic priest in Germany, developed a system for avoiding pregnancy based on basal body temperature. [12] This temperature method was found to be more effective at helping women avoid pregnancy than were calendar-based methods. Over the next few decades, both systems became widely used among ...
Pregnancy can result in up to 25% of the user population per year for users of the symptoms-based or calendar-based methods, depending on the method used and how carefully it was practised. Natural family planning has shown very weak and contradictory results in pre-selecting the sex of a child, with the exception of a Nigerian study at odds ...
Couples use condoms or barrier methods to prevent pregnancy on fertile days. An efficacy trial found that CycleBeads was more than 95% effective at preventing pregnancy with correct use and approximately 88% effective with typical use among women who reported recent cycles of 26–32 days. [ 3 ]
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Birth control, also known as contraception, anticonception, and fertility control, is the use of methods or devices to prevent pregnancy. [1] Birth control has been used since ancient times, but effective and safe methods of birth control only became available in the 20th century. [2]
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