title: 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.
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.
authors.affiliation: Department of Obstetrics and Gynaecology, Siriraj Hospital, Bangkok, Thailand.
authors.forename: S
authors.initials: S
authors.lastname: Koetsawang
authors.forename: G
authors.initials: G
authors.lastname: Ji
authors.forename: U
authors.initials: U
authors.lastname: Krishna
authors.forename: A
authors.initials: A
authors.lastname: Cuadros
authors.forename: G I
authors.initials: GI
authors.lastname: Dhall
authors.forename: R
authors.initials: R
authors.lastname: Wyss
authors.forename: J
authors.initials: J
authors.lastname: Rodriquez la Puenta
authors.forename: A T
authors.initials: AT
authors.lastname: Andrade
authors.forename: T
authors.initials: T
authors.lastname: Khan
authors.forename: E S
authors.initials: ES
authors.lastname: Kononova
mesh_terms: D000282:Administration, Intravaginal; D001835:Body Weight; D003274:Contraceptive Devices, Female; D005260:Female; D006801:Humans; D016912:Levonorgestrel; D015337:Multicenter Studies as Topic; D009644:Norgestrel; D011247:Pregnancy / Q000208:ethnology
chemical_list: D009644:Norgestrel; D016912:Levonorgestrel