Author： Ooki Syuichi Yokoyama Yoshie Asaka Akio
Publisher： Australian Academic Press
ISSN： 1369-0523
Source： Twin Research, Vol.7, Iss.3, 2004-06, pp. : 228-232
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Abstract
Though twinning rates have been rapidly increasing in Japan, the problem of zygosity misclassification at birth has been paid little attention. By analyzing four independent samples, the authors found that at a constant rate about 25–30% of monozygotic twins were misclassified as dizygotic twins at birth. This percentage is in very good accordance with that of monozygotic twins having dizygous placenta. Generally the obstetricians informed twins' parents about their children's zygosity. The number of placentas, as informed by obstetricians, was very strongly associated with zygosity. Concluding, even now many monozygotic twins in Japan may be misclassified as dizygotic at birth by obstetricians based solely on the number of placenta.
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