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- W2076431985 abstract "<h3>Abstract</h3> <b>Objective</b>: To determine the contraceptive efficacy of the lactational amenorrhoea method. <b>Design</b>: Non-comparative prospective trial. <b>Setting</b>: Urban Manila, the Philippines. <b>Subjects</b>: 485 lower income, educated women with extensive experience of breast feeding. <b>Intervention</b>: Women were offered all available contraceptives for use after birth. Those who chose the lactational amenorrhoea method were taught the method, screened for the study, and followed for 12 months to determine the risk of pregnancy when the method was used. <b>Main outcome measures</b>: Life table pregnancy rates during correct and incorrect use of the method, censored monthly in the event of sexual abstinence or the use of another contraceptive method. <b>Results</b>: The lactational amenorrhoea method was 99% effective when used correctly (that is, during lactational amenorrhoea and full or nearly full breast feeding for up to six months). At 12 months the effectiveness during amenorrhoea dropped to 97%. <b>Conclusions</b>: The lactational amenorrhoea method provided as much protection from pregnancy as non-breast feeding women experience with non-medicated intrauterine devices and barrier methods. The contraceptive effect of lactation cannot be attributed to lactational or postpartum abstinence. <h3>Key messages</h3> Henceforth, data from clinical trials on contra-ceptives must be subject to the rigours of multiple censoring such as applied here. By excluding periods of abstinence from the calculation of risk of pregnancy, the contraceptive protection of the method cannot be attributed to postpartum or lac- tational abstinence During the first year post partum, the rate of pregnancy before the return of menses in lactating women was less than 3%" @default.
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- W2076431985 date "1996-10-12" @default.
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- W2076431985 title "Effectiveness of lactational amenorrhoea in prevention of pregnancy in Manila, the Philippines: non-comparative prospective trial" @default.
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- W2076431985 doi "https://doi.org/10.1136/bmj.313.7062.909" @default.
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