Zygosity Misclassification of Recent Young Twins by Maternal Reports in Japan

@article{Ooki2017ZygosityMO,
  title={Zygosity Misclassification of Recent Young Twins by Maternal Reports in Japan},
  author={Syuichi Ooki},
  journal={Journal of Pregnancy and Child Health},
  year={2017},
  volume={4},
  pages={1-5}
}
  • S. Ooki
  • Published 30 April 2017
  • Medicine
  • Journal of Pregnancy and Child Health
The problem of zygosity misclassification of twins has been paid little attention in Japan. By analyzing maternal reports collected using an internet questionnaire, the author found that around 30% of monozygotic twins were misclassified as dizygotic twins, mainly by obstetricians. On the other hand, the percentage of dizygotic twin pairs misclassified as monozygotic twins was lower. Misclassification was more frequently observed in cases of spontaneous pregnancy compared to iatrogenic… 

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TLDR
It is found that at a constant rate about 25–30% of monozygotic twins were misclassified as dizygotic twins at birth by obstetricians based solely on the number of placenta.
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