Secular trends in gestational age and birthweight in twins.

  title={Secular trends in gestational age and birthweight in twins.},
  author={Marij Gielen and Catharina Eugenie Maria van Beijsterveldt and Catherine A. Derom and Robert F M H Vlietinck and Jan G Nijhuis and Maurice P. A. Zeegers and Dorret I. Boomsma},
  journal={Human reproduction},
  volume={25 9},
BACKGROUND 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… CONTINUE READING