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The failure rate of each of these oral contraceptives is 7%. [1] Some choose to get an injection or a shot in order to prevent pregnancy. This is an option where a medical professional will inject the hormone progestin into a woman's arm or buttocks every 3 months to prevent pregnancy. The failure rate is 4%. [1]
One US study, based on self-reported data from the 2006–2010 cycle of the National Survey of Family Growth, found significant differences in failure rate based on parity status. Women with 0 previous births had a 12-month failure rate of only 8.4%, which then increased to 20.4% for those with 1 prior birth and again to 27.7% for those with 2 ...
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.
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]
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. [42] [43]
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% ...
The diaphragm is a barrier method of birth control. [3] It is moderately effective, with a one-year failure rate of around 12% with typical use. [4] It is placed over the cervix with spermicide before sex and left in place for at least six hours after sex. [5] [6] Fitting by a healthcare provider is generally required. [5] Side effects are ...
Post-ovulation methods (i.e., abstaining from intercourse from menstruation until after ovulation) have a method failure rate of 1% per year. The symptothermal method has a method failure rate of 2% per year. Cervical mucus–only methods have a method failure rate of 3% per year. Calendar rhythm has a method failure rate of 9% per year.
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related to: pregnancy pull out failure rate based on month of birth date chart