Koetsawang S, Ji G, Krishna U, Cuadros A, Dhall G I, Wyss R, Rodriquez la Puenta J, Andrade A T, Khan T, Kononova E S
Department of Obstetrics and Gynaecology, Siriraj Hospital, Bangkok, Thailand.
Contraception. 1990 Feb;41(2):143-50. doi: 10.1016/0010-7824(90)90143-j.
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.
本文研究了1005名使用每24小时释放20微克左炔诺孕酮阴道环的女性的妊娠率与体重之间的关系。虽然一年的总体妊娠率为3.7%，但发现女性体重增加时妊娠风险也会增加。例如，一名40公斤的女性估计妊娠率为1.7%，而一名80公斤的女性为9.8%。
