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Comparison of Fertility Awareness‒Based Methods of Contraception

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Method	Pregnancy Rate in First Year of Use With Typical Use (per 100 woman-years)
Standard days	11.2 to 14.1
Two-day	13.7
Symptothermal	11.2 to 33.0
Data from Peragallo Urrutia R, Polis CB, Jensen ET, Greene ME, Kennedy E, Stanford JB. Effectiveness of Fertility Awareness-Based Methods for Pregnancy Prevention: A Systematic Review. Obstet Gynecol. 2018;132(3):591-604. doi:10.1097/AOG.0000000000002784