Pearl index


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Pearl index

(pĕrl),
the number of failures of a contraceptive method per 100 woman years of exposure.
A formula that allows comparison of the efficacy of contraceptive methods, calculated as the pregnancy rate in population divided by 100 years of user exposure

Pearl Index

Obstetrics A formula that allows comparison of the efficacy of contraceptive methods, calculated as the pregnancy rate in population divided by 100 yrs of exposure. See Breast feeding, Coitus interruptus, Condoms, Morning-after pill, Contraception, Natural family planning, Norplant, Rhythm method, RU 486.
Pearl index–pregnancies/100 years of use
Physiologic 15-30/100 years: Coitus interruptus, natural family planning (rhythm or safe period), eg calendar method, evaluation of cervical mucosa or temperature, breast feeding
Chemical 15-20/100 years: Contraceptive sponges
Barrier 2-20/100 years: Intrauterine devices, condoms
Hormonal 1-3/100 years
Surgical << 1/100 years: Ligation of fallopian tubes, vas deferens  

Pearl in·dex

(pĕrl in'deks)
The number of failures of a contraceptive method per 100 woman years of exposure.

Pearl,

Raymond, U.S. biologist, 1879-1940.
Pearl index - the number of failures of a contraceptive method per 100 woman years of exposure.
References in periodicals archive ?
Similar to present study Horacio croxatto et al (1999) noticed no pregnency occurred during treatment with implanon, resulting in a pearl index of 0.
The study will assess the effectiveness of the patch in preventing pregnancy using the Pearl Index as the primary contraceptive efficacy measure.
According to the company, the study will assess the effectiveness of the patch in preventing pregnancy using the Pearl Index as the primary contraceptive efficacy measure.