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Clinical Trial
. 1990 Feb;41(2):143-50.
doi: 10.1016/0010-7824(90)90143-j.

Microdose intravaginal levonorgestrel contraception: a multicentre clinical trial. III. The relationship between pregnancy rate and body weight. World Health Organization. Task Force on Long-Acting Systemic Agents for Fertility Regulation

S Koetsawang  1 , G Ji, U Krishna, A Cuadros, G I Dhall, R Wyss, J Rodriquez la Puenta, A T Andrade, T Khan, E S Kononova, et al.
Affiliations
Clinical Trial

Microdose intravaginal levonorgestrel contraception: a multicentre clinical trial. III. The relationship between pregnancy rate and body weight. World Health Organization. Task Force on Long-Acting Systemic Agents for Fertility Regulation

S Koetsawang et al. Contraception. 1990 Feb.

Abstract

This paper investigates the relationship between pregnancy rates and body weight of 1005 women using a vaginal ring releasing 20 micrograms levonorgestrel per 24 hours. While the overall pregnancy rate at one year was 3.7%, it was found that women have an increasing risk of pregnancy with increasing body weight. For example, a woman of 40 kg has an estimated pregnancy rate of 1.7% in contrast to 9.8% for a woman of 80 kg weight.

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