Perinatal outcomes of in vitro fertilization twins: A systematic review and meta-analyses

OBJECTIVE: Uncontrolled studies suggest that in vitro fertilization twins have increased rates of preterm birth and low birth weight and would warrant increased antenatal monitoring. The objective of this meta-analysis was to determine whether the incidence of poor obstetric outcomes is higher for in vitro fertilization twins than for spontaneously conceived twins who were matched for maternal age. STUDY DESIGN: Medline and EMBASE were searched …