[Adverse perinatal outcomes in Mexican women with twin pregnancy achieved by assisted reproduction techniques vs. spontaneous twin pregnancies].

Background: Twin pregnancies (TP) have shown a greater risk of adverse perinatal outcomes than singletons have. However, there is still no consensus about whether the TP achieved by assisted reproduction techniques (ART) have worse perinatal outcomes compared with TP achieved spontaneously.

Objective: Compare the incidence of adverse perinatal outcomes (preterm birth, premature rupture of membranes, gestational diabetes, pregnancy-induced hypertension, anemia, weight and destination of the newborn) in Mexican women with TP achieved spontaneously vs those with TP achieved by ART.