Author:
Imaizumi Yoko,Asaka Akio,Inouye Eiji
Abstract
Stillbirth rates of MZ and DZ twins in Japan gradually decreased during the period 1960–1967 and in 1974. The stillbirth rates of MZ and DZ twins were 0.270 and 0.224 in 1960, respectively, whereas the corresponding figures in 1974 were 0.135 and 0.099. The stillbirth rate was higher in MZ than DZ twins, in males than females, and in the second- than in the first-born. In both zygosities, the rates were higher in the first birth order than in the second, and then increased with birth order except in the sixth birth or more for MZ twins and for DZ twins born to mothers aged 35–39 years. The shorter the gestational age, the higher the stillbirth rate in both MZ and DZ twins, as expected. Mean gestational age was slightly shorter in MZ than in DZ twins. The decrease of the stillbirth rates can be explained partly by the reduction of twins with higher birth order, where high stillbirth rates of MZ and DZ twins are seen, and the reduction of older mothers.
Publisher
Cambridge University Press (CUP)
Cited by
12 articles.
订阅此论文施引文献
订阅此论文施引文献,注册后可以免费订阅5篇论文的施引文献,订阅后可以查看论文全部施引文献
1. Yearly Changes in Stillbirth Rates of Zygotic Twins in Japan, 1975-1994;Acta geneticae medicae et gemellologiae: twin research;1998-01
2. Triplets and Higher Order Multiple Births in Japan;Acta geneticae medicae et gemellologiae: twin research;1990-07
3. Perinatal Mortality in Twins, Australia, 1973-1980: I;Acta geneticae medicae et gemellologiae: twin research;1988-10
4. The Recent Trends in Multiple Births and Stillbirth Rates in Japan;Acta geneticae medicae et gemellologiae: twin research;1987-07
5. The Secular Trend of Twinning in Australia, 1853–1982;Acta geneticae medicae et gemellologiae: twin research;1986-04