Technique for reporting effectiveness of birth control
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 index was introduced by Raymond Pearl in 1934.[1] It has remained popular for over eighty years, in large part because of the simplicity of the calculation.
^Pearl, Raymond (1933). "Factors in human fertility and their statistical evaluation". Lancet. 222 (5741): 607–611. doi:10.1016/S0140-6736(01)18648-4.
The PearlIndex, also called the Pearl rate, is the most common technique used in clinical trials for reporting the effectiveness of a birth control method...
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are generally presented for the first year of use. Most commonly the PearlIndex is used to calculate effectiveness rates, but some studies use decrement...
are generally presented for the first year of use. Most commonly the PearlIndex is used to calculate effectiveness rates, but some studies use decrement...
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control effectiveness. In this role, they are an alternative to the PearlIndex. As used in birth control studies, a decrement table calculates a separate...
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are generally presented for the first year of use. Most commonly the PearlIndex is used to calculate effectiveness rates, but some studies use decrement...
are generally presented for the first year of use. Most commonly, the PearlIndex is used to calculate effectiveness rates, but some studies use decrement...
and insurers.[relevant?] Failure rates may be calculated by either the PearlIndex or a life table method. A "perfect-use" rate is where all rules of the...
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Trussell J, Scherwitzl R (December 2017). "Perfect-use and typical-use PearlIndex of a contraceptive mobile app". Contraception. 96 (6): 420–425. doi:10...
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