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Secular trends in gestational age and birthweight in twins.

M Gielen, C E M van Beijsterveldt, C Derom, R Vlietinck, J G Nijhuis, M P A Zeegers, and D I Boomsma

Hum Reprod 25(9):2346-53 (2010) PMID 20601680

In recent decades, the overall rate of preterm births has increased. The aim of the present study was to examine whether this trend is also seen for multiple gestations. More specifically, we examined if there has been a decrease in gestational age for live born monozygotic (MZ) and dizygotic (DZ) twins and if there has been a simultaneous change in birthweight. The contributions of fertility treatments and Caesarean sections were taken into consideration. All analyses were carried out in two large European twin cohorts.

DOI: 10.1093/humrep/deq160
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