title: [Multiple pregnancies. FIVNAT].
abstract: FIVNAT register has collected 10,510 deliveries after IVF attempts from 1986 to 1993. The multiple pregnancy rate is 27.2%, 23.5% for twin pregnancies, 3.6% for triplets pregnancies and 0.15% for multiples pregnancies over 3. Triplet pregnancy proportion, before embryo reduction, reached 8% in 1989 then decreased to 6.1% in 1993. In 1994 the proportion of 3 and 4 embryos transfers has decreased and that of 2 embryos transfers has increased, but global pregnancy rate per transfer is 1.6% lower than pregnancy rate in 1993. This point shows how difficult it is to decrease multiple pregnancy rate without decreasing global pregnancy rate.
mesh_terms: D000328:Adult; D004624:Embryo Transfer; D005260:Female; D005307:Fertilization in Vitro; D005602:France; D006801:Humans; D011247:Pregnancy; D011256:Pregnancy Outcome; D018607:Pregnancy Reduction, Multifetal; D011272:Pregnancy, Multiple / Q000706:statistics & numerical data; D012042:Registries