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  2. Pearl Index - Wikipedia

    en.wikipedia.org/wiki/Pearl_Index

    The Pearl Index, also called the Pearl rate, is the most common technique used in clinical trials for reporting the effectiveness of a birth control method. It is a very approximate measure of the number of unintended pregnancies in 100 woman-years of exposure that is simple to calculate, but has a number of methodological deficiencies.

  3. Coitus interruptus - Wikipedia

    en.wikipedia.org/wiki/Coitus_interruptus

    This was a “typical use” failure rate, including user failure to use the method correctly. [12] In comparison, the combined oral contraceptive pill has an actual use failure rate of 2–8%, [13] while intrauterine devices (IUDs) have an actual use failure rate of 0.1–0.8%. [14] Condoms have an actual use failure rate of 10–18%. [9]

  4. Comparison of birth control methods - Wikipedia

    en.wikipedia.org/wiki/Comparison_of_birth...

    The failure rate of a copper IUD is approximately 0.8% and can prevent pregnancy for up to 10 years. The hormonal IUD (also known as levonorgestrel intrauterine system or LNg IUD) releases a small amount of the hormone called progestin that can prevent pregnancy for 3–8 years with a failure rate of 0.1-0.4%. [ 1 ]

  5. Birth control - Wikipedia

    en.wikipedia.org/wiki/Birth_control

    Levonorgestrel pills, when used within 3 days, decrease the chance of pregnancy after a single episode of unprotected sex or condom failure by 70% (resulting in a pregnancy rate of 2.2%). [11] Ulipristal , when used within 5 days, decreases the chance of pregnancy by about 85% (pregnancy rate 1.4%) and is more effective than levonorgestrel.

  6. Calendar-based contraceptive methods - Wikipedia

    en.wikipedia.org/wiki/Calendar-based...

    A woman whose menstrual cycles ranged in length from 30 to 36 days would be estimated to be infertile for the first 11 days of her cycle (30-19=11), to be fertile on days 12–25, and to resume infertility on day 26 (36-10=26). When used to avoid pregnancy, such fertility awareness-based methods have a typical-use failure rate of 25% per year. [18]

  7. Creighton Model FertilityCare System - Wikipedia

    en.wikipedia.org/wiki/Creighton_Model_Fertility...

    For avoiding pregnancy, the perfect-use failure rate of Creighton was 0.5%, which means that for each year that 1,000 couples using this method perfectly, that there are 5 unintended pregnancies. The typical-use failure rate, representing the fraction of couples using this method that actually had an unintended pregnancy, is reported as 3.2%.

  8. Combined oral contraceptive pill - Wikipedia

    en.wikipedia.org/wiki/Combined_oral...

    The perfect use failure rate is based on a review of pregnancy rates in clinical trials, and the typical use failure rate is based on a weighted average of estimates from the 1995 and 2002 US National Surveys of Family Growth (NSFG), corrected for underreporting of abortions.

  9. Fertility awareness - Wikipedia

    en.wikipedia.org/wiki/Fertility_awareness

    When used to avoid pregnancy, these systems have higher perfect-use failure rates than symptoms-based systems but are still comparable with barrier methods, such as diaphragms and cervical caps. Mucus- and temperature-based methods used to determine post-ovulatory infertility, when used to avoid conception, result in very low perfect-use ...

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