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Effectiveness of Fertility Awareness–Based Methods for Pregnancy Prevention: A Systematic Review
Abstract
OBJECTIVE: To summarize best available prospective data on typical and perfect use effectiveness of fertility awareness–based methods for avoiding pregnancy. DATA SOURCES: We conducted a systematic review of studies published in English, Spanish, French, or German by June 2017 in MEDLINE, EMBASE, CINAHL, Web of Science, and ClinicalTrials.gov. METHODS OF STUDY SELECTION: We reviewed 8,755 unique citations and included 53 studies that contained 50 or greater women using a specific fertility awareness–based method to avoid pregnancy, calculated life table pregnancy probabilities or Pearl rates, and prospectively measured pregnancy intentions and outcomes. We systematically evaluated study quality. TABULATION, INTEGRATION, AND RESULTS: Of 53 included studies, we ranked 0 high quality, 21 moderate quality, and 32 low quality for our question of interest. Among moderate-quality studies, first-year typical use pregnancy rates or probabilities per 100 woman-years varied widely: 11.2–14.1 for the Standard Days Method, 13.7 for the TwoDay Method, 10.5–33.6 for the Billings Ovulation Method, 4–18.5 for the Marquette Mucus-only Method, 9.0–9.8 for basal body temperature methods, 13.2 for single-check symptothermal methods, 11.2–33.0 for Thyma double-check symptothermal methods, 1.8 for Sensiplan, 25.6 for Persona, 2–6.8 for the Marquette Monitor-only Method, and 6–7 for the Marquette Monitor and Mucus Method. First-year perfect use pregnancy rates or probabilities among moderate-quality studies were 4.8 for the Standard Days Method, 3.5 for the TwoDay Method, 1.1–3.4 for the Billings Ovulation Method, 2.7 for the Marquette Mucus Method, 0.4 for Sensiplan, 12.1 for Persona, and 0 for the Marquette Monitor. CONCLUSION: Studies on the effectiveness of each fertility awareness–based method are few and of low to moderate quality. Pregnancy rates or probabilities varied widely across different fertility awareness–based methods (and in some cases, within method types), even after excluding low-quality studies. Variability across populations studied precludes comparisons across methods.
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“and they are becoming increasingly popular for contraception14–17 and pregnancy planning.18”
From Real-world menstrual cycle characteristics of more than 600,000 menstrual cycles (2019) · cites this paper as [16]
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Self-citation
Metadata
- Authors
- Peragallo Urrutia, R., Polis, C. B., Jensen, E. T., Greene, M. E., Kennedy, E., & Stanford, J. B.
- Venue
- Obstetrics & Gynecology
- Published
- 2018-09
- Volume
- 132
- Issue
- 3
- Pages
- 591-604
- ISSN
- 0029-7844 (ISSN-L)
- OpenAlex
- W2887193321
- Cited by
- 101
- References
- 98
- Citations by year
- 2026: 10 · 2025: 15 · 2024: 13 · 2023: 11 · 2022: 12 · 2021: 9 · 2020: 12 · 2019: 14 · 2018: 5
- FWCI
- 1.81
- Type
- journal article
- Language
- en
- Open access
- closed
- Locations
- Obstetrics and Gynecology (publishedVersion)
- PubMed (publishedVersion)
- Topics
- Health Sciences › Medicine › Public Health, Environmental and Occupational Health › Reproductive Health and Contraception
- Health Sciences › Medicine › Reproductive Medicine › Reproductive Health and Technologies
- Social Sciences › Arts and Humanities › History › Historical Studies on Reproduction, Gender, Health, and Societal Changes
- Keywords
- fertility awareness-based methods, contraception, contraceptive effectiveness, Standard Days Method, Billings Ovulation Method, basal body temperature, symptothermal method, personas, natural family planning
- MeSH terms
- Awareness, Family Planning Services, Female, Fertility, Humans, Pregnancy, Reproductive Techniques
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Registry, retraction, Cites and statistics results are computed, not judged, with one exception: a printed reference that no index lists is read once by a model before it counts as a citation error. Claims are extracted by a model and kept only when their quote appears verbatim in the text; each cited source is then checked, with a model’s help, for whether it says what the claim relies on. Those verdicts can be wrong — read the claim’s quote and the cited source before relying on one.
Statistics and arithmetic are recomputed, not judged.
Confidence bands are shown only for fields calibrated on our annotated test set. None is calibrated yet, so no band is shown.
What counts as a claim ›How we measure confidence ›How we check this ›
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