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尽管目前有了有效的避孕方法,但流产与出生之比仍很高,近十年中还有所增加。1971年英国的威尔士妇女的出生率与流产之比为1:8,1986年的对应比率为1:4。瑞典1988年的出生率与流产之比为1:4。现对年龄为19和24岁的同一妇女中确定妊娠史和避孕方法的情况进行研究。通过信访的纵向群体研究,对从人口登记中获得1962年出生,1981年居住在瑞典Goteborg,年龄为19岁的妇女2621例,随机抽样1/4(n=656),信访有关避孕、生育史和有关因素,寄回完整答案者共596人(91％)。从1981年的回答人群中,1986
Despite the current effective contraceptive methods, the rate of miscarriage to birth is still high, with an increase in the last decade. In 1971, Welsh women in England had a 1: 8 birth and abortion ratio, compared with 1: 4 in 1986. The ratio of births to abortions in Sweden in 1988 was 1: 4. The study on the determination of pregnancy history and methods of contraception among the same women aged 19 and 24 years is now under way. According to the vertical group study of petitions, 2621 women born from 1962 were registered in the population and 1981 were aged 19 in Goteborg, Sweden. Random sampling 1/4 (n = 656) And related factors, send a complete answer a total of 596 people (91%). From the crowd in 1981, 1986