Imaizumi Y
Faculty of Health Science, Hyogo University, Kakogawa City, Hyogo Prefecture, 675-0101, Japan.
Twin Res. 2001 Aug;4(4):232-7. doi: 10.1375/1369052012443.
Data for sets of multiples under 16 years of age were obtained from the population censuses of Japan in 1990 and 1995. These numbered 147,188 twin pairs, 1410 sets of triplets, 59 sets of quadruplets, and 3 sets of quintuplets in 1990, with the corresponding numbers in 1995 being 141,354, 2,211, 136 and 12, respectively. The total number of sets of multiples was 148,660 in 1990 and 143,713 in 1995. Twinning, triplet, quadruplet and quintuplet rates were estimated for each age. Rates of monozygotic twins and triplets remained constant age by age up to 15 years, while the dizygotic twinning rate, and rates of di- and tri-zygotic triplets decreased over the same period. Quadruplet and quintuplet rates also decreased. The accuracy of estimating number of multiples from census data is discussed using data on vital statistics.
1990年和1995年日本人口普查获取了16岁以下多胞胎的数据。1990年有147,188对双胞胎、1410组三胞胎、59组四胞胎和3组五胞胎，1995年对应的数量分别为141,354对、2,211组、136组和12组。1990年多胞胎总数为148,660组，1995年为143,713组。估算了各年龄段的双胞胎、三胞胎、四胞胎和五胞胎出生率。同卵双胞胎和三胞胎的出生率在15岁之前各年龄段保持不变，而异卵双胞胎出生率以及双卵和三卵三胞胎的出生率在同一时期有所下降。四胞胎和五胞胎出生率也下降了。利用人口动态统计数据讨论了根据普查数据估算多胞胎数量的准确性。
