...The frequency of multiple births is expressed by the Herrin formula, which states that n fetuses occur once for every 80 n -1 single births. Monozygotic twins, which are produced from one fertilized egg, occur in 0.3-0.4% of births, with little difference between races, but dizygotic twins, which are produced from two fertilized eggs, vary considerably between races, from 1.3-0.3%. In Japan, dizygotic twins are rare, at 0.3%. *Some of the terminology that refers to "identical twins" is listed below. Source | Heibonsha World Encyclopedia 2nd Edition | Information |
…多胎分娩の頻度としてはヘリンの式があり,n胎は単胎分娩80n-1に対して1回みられる。1個の受精卵からできる一卵性双胎は人種による差は少なく,出産の0.3~0.4%にみられるが,2個の受精卵からできる二卵性双胎は人種により1.3~0.3%と相当の差がある。日本では二卵性双胎が0.3%と少ない。… ※「一卵性双胎」について言及している用語解説の一部を掲載しています。 出典|株式会社平凡社世界大百科事典 第2版について | 情報 |
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