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1多胎妊娠的发生率多胎妊娠中以双胎最多见,三胎少见,四胎以上更少见.海林(Hellin,1895)根据大量资料统计得出多胎发生规律:即在任何一个时期中,若以1∶N表示双胎分娩与全部分娩之比,则在同时期中,三胎分娩的比例为1∶N~2,四胎分娩比例为1∶N~3,依此类推。Gcdd统计13个国家双胎发生率为1∶51～1∶249。双胎分为单卵双胎与双卵双胎。单卵双胎据报道在世界范围内发生率比较一致为3‰～5‰,双卵双胎为4‰～50‰,故双胎发生率的不同主要决定于双卵双胎的发生率。我国双胎发生率为1∶67.6。我院自1981年3月至1991年3月10年中分娩总数为8855
1 The incidence of multiple pregnancies The most common twins in multiple pregnancies, rare in three infants, and more common in more than four infants.Hellin (1895) based on a large number of data statistics found that multiple births: that is, in any period, if The ratio of twins delivery to full delivery was 1: N. In the same period, the ratio of three births was 1: N ~ 2, the ratio of four births was 1: N ~ 3, and so on. Gcdd statistical twins in 13 countries the incidence of 1:51 ~ 1:249. Twins are divided into monozygotic twins and twins twins. It is reported that monozygotic twins in the world incidence of more consistent 3 ‰ ~ 5 ‰, double-egg twins 4 ‰ ~ 50 ‰, so the incidence of twins is mainly determined by the incidence of twins twins. The incidence of twins in China is 1:67.6. The total number of deliveries in our hospital from March 1981 to March 1991 was 8855