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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.
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]
If breastfeeding is the infant's only source of nutrition and the baby is less than 6 months old, 93–99% of women are estimated to have protection from becoming pregnant in the first six months (0.75–7.5% failure rate). [112] [113] The failure rate increases to 4–7% at one year and 13% at two years. [114]
The withdrawal method, also known as coitus interruptus or pulling out, is a behavior that involves halting penile-vaginal intercourse to remove the penis out and away from the vagina prior to ejaculation. [51] [52] Withdrawal is considered a less-effective contraceptive method, with typical-use failure rates around 20%.
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 SERM ormeloxifene is less effective than the steroid hormone methods; studies have found a perfect-use failure rate near 2% per year. [11] [12] Long-acting methods such as the implant and the IUS are user-independent methods. [13] For user-independent methods, the typical or actual-use failure rates are the same as the method failure rates ...
A contraceptive patch, also known as "the patch", is a transdermal patch applied to the skin that releases synthetic oestrogen and progestogen hormones to prevent pregnancy. They have been shown to be as effective as the combined oral contraceptive pill with perfect use, and the patch may be more effective in typical use.