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contraceptive effectiveness

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contraceptive effectiveness,
the effectiveness of a method of contraception in preventing pregnancy. For clinical purposes it combines the theoretic effectiveness of the device, medication, or method and the use effectiveness. It is sometimes represented as a percentage but more accurately as the number of pregnancies per 100 woman-years. The average pregnancy rate for a couple who are sexually active and do not use contraceptives is equivalent to 85 pregnancies per 100 woman-years. A contraceptive method that results in a pregnancy rate of fewer than 10 pregnancies per 100 woman-years is considered highly effective. See also pregnancy rate, woman-year.


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John's wort might interfere with contraceptive effectiveness.
Women's health update: St. John's wort and oral contraceptives by Hudson, Tori / Townsend Letter
The family planning literature contains numerous studies of contraceptive effectiveness among women, (4) use of contraceptives generally (and use of particular methods), (2,5) and factors affecting contraceptive use and nonuse.
The impact of programs to increase contraceptive use among adult ... by Kirby, Douglas / Perspectives on Sexual and Reproductive Health
4) Whether such reduced hormone levels affect contraceptive effectiveness is unclear because no studies have looked at actual clinical outcomes.
How does HIV therapy affect hormonal contraception? by Shears, Kathleen Henry / Network
 
 
 
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