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In the degenerated case of all women becoming pregnant instantly, the rate would be infinite. In the user action required column, items that are non-user dependent (require action once per year or less) also have a blue background. Some methods may be used simultaneously for higher effectiveness rates.
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 US Food and Drug Administration (FDA) initiated studies evaluating the health of more than 800,000 women taking combined oral contraceptive pills and found that the risk of VTE was 93% higher for women who had been taking drospirenone combined oral contraceptive pills for 3 months or less and 290% higher for women taking drospirenone ...
Birth control, also known as contraception, anticonception, and fertility control, is the use of methods or devices to prevent pregnancy. [1] [2] Birth control has been used since ancient times, but effective and safe methods of birth control only became available in the 20th century. [3]
Hormonal contraception is highly effective: when taken on the prescribed schedule, users of steroid hormone methods experience pregnancy rates of less than 1% per year. Perfect-use pregnancy rates for most hormonal contraceptives are usually around the 0.3% rate or less. [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.
For comparison, here are the typical-use effectiveness rates for other common contraceptive methods, per the Centers for Disease Control and Prevention: Hormone-free, copper IUD: 99.2% Hormonal ...
Actual use or typical use effectiveness rates include all women relying on fertility awareness to avoid pregnancy, including those who fail to meet the "perfect use" criteria. Rates are generally presented for the first year of use. [41] Most commonly, the Pearl Index is used to calculate effectiveness rates, but some studies use decrement ...