BIOLOGICAL EFFECTS OF DELAYED CHILDBEARING

在30岁或以上的女性中，第一胎的数量显著增加。 在美国，这一数字从1975年增加到1986年，从 每年69,000至230,000。关于是否有这样的 推迟生育的人中不良生育结局的风险增加。 还有一个问题是，报告的风险增加是否对 出生结局是由于受到其他因素的干扰。这项研究是 使用基于人口的瑞典数据集，该数据集来自 1983至1987年，除人口统计特征外，还包括 关于医疗和妊娠并发症的信息，病史 不孕症、生育史以及吸烟。这是一个独一无二的 数据集，我们不知道有任何可比的人口基于 在美国的信息。已经出版了三份手稿 从这项研究中。这个项目已经完成了。

There has been a marked increase in first births among women age 30 or more in the U.S. and the numbers have increased from 1975 to 1986 from 69,000 to 230,000 per year. There is a controversy as to whether there is an increased risk of adverse birth outcome among delayed childbearers. There is also a question whether the reported increase risk in adverse birth outcome is due to confounding by other factors. This research is using a population based Swedish data set of more than 500,000 births from 1983 to 1987, which in addition to demographic characteristics includes information on medical and pregnancy complications, history of infertility, reproductive history, as well as smoking. This is a unique data set and we are not aware of any comparable population based information in the United States. Three manuscripts have been published from this study. This project is completed.