Since the 1970s, the national twin birth rates have been increasing worldwide. Apart from
the increasing childbearing age, the main cause is the use of assisted reproductive …

BACKGROUND It is estimated that there is at least a 2-fold rise in the incidence of
monozygotic twinning after assisted reproductive technology compared with natural …

The presence of congenital malformations in infants born after IVF was studied from a
register consisting of practically all infants born in Sweden after IVF, 1982–1997 (n= 9111) …

Twin birth rates have increased markedly in developed countries since the 1970s for two
primary reasons: increasing maternal age and the advent and increasing use of fertility …

Objectives To establish the risk factors for monozygotic twin (MZT) and monochorionic twin
(MCT) pregnancies after in vitro fertilization (IVF). Design Systematic review and meta …

OBJECTIVE: To evaluate the incidence of monozygotic twinning (MZT) in pregnancies
conceived after blastocyst transfer compared to cleavage-stage transfer. DESIGN …

A 3 year retrospective analysis was conducted of pregnancies achieved after various
assisted reproductive treatment modalities in our infertility practice, to calculate and compare …

OBJECTIVE: To determine the sex ratio and risk of monozygotic twinning (MZT) after
blastocyst transfer compared with cleavage-stage embryo transfer (ET) in fresh IVF cycles …

BACKGROUND: This study attempts to identify risk factors for monozygotic (MZ) twinning
following assisted conception. METHODS: Eighty‐one MZ twinning pregnancies that …

BACKGROUND Monozygotic (MZ) twins are believed to arise from the fission of a single
fertilized embryo at different stages. Monochorionic MZ twins, who share one chorion …