title: Contraceptive efficacy of intrauterine devices.
abstract: To compare the contraceptive efficacy of various types of intrauterine devices (IUD; copper devices, Nova-T, intrauterine contraceptive systems, levonorgestrel-releasing devices), we reviewed all relevant publications on this subject that have been published over the last 2 decades. The first point to be highlighted by this review is the excellent effectiveness of IUDs, with a global cumulative pregnancy rate <2% at 5 years, whatever the type of device used. We observed a large variation in efficacy rate according to the type of IUD and also according to study design. Nevertheless, of all the types of IUDs, the levonorgestrel-releasing IUD and to a lesser extent the TCu380A IUD seem to be the most effective, with a cumulative pregnancy rate at 5 years of <0.5% for the levonorgestrel-releasing IUD and between 0.3% and 0.6% for the TCu380A IUD.
authors.affiliation: Human Fertility Research Group, Toulouse University Hospital, France. thonneau.p@chu-toulouse.fr
authors.forename: Patrick F
authors.initials: PF
authors.lastname: Thonneau
authors.forename: Thierry
authors.initials: T
authors.lastname: Almont
authors.forename: Thierry E
authors.initials: TE
authors.lastname: Almont
mesh_terms: D004867:Equipment Design; D005260:Female; D006801:Humans; D007434:Intrauterine Devices; D016896:Treatment Outcome