title: [Twin pregnancy. Its incidence].
abstract: The authors evaluate changes in the incidence and proportion of the life births by plurality in Mothernal Hospital in Sofia between 1991-1995 and compare it with the incidence of multiple births in other countries in the world. The influence of some factors on the incidence of multiple pregnancy are discussed.
authors.forename: T
authors.initials: T
authors.lastname: Chernev
authors.forename: M A
authors.initials: MA
authors.lastname: Rakhab
authors.forename: R K
authors.initials: RK
authors.lastname: Ruseva
authors.forename: Zh
authors.initials: Zh
authors.lastname: Karag'ozova
mesh_terms: D002031:Bulgaria / Q000453:epidemiology; D005260:Female; D006801:Humans; D015994:Incidence; D007231:Infant, Newborn; D011247:Pregnancy; D011272:Pregnancy, Multiple / Q000706:statistics & numerical data*; D012189:Retrospective Studies; D014429:Twins, Dizygotic; D014430:Twins, Monozygotic
vernacular_title: Dvuplodna bremennost. Chestota.