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。 在美国更多，从1975年到1986年，从 每年69,000至230,000。有争议的是，是否有 推迟分娩会增加不良分娩结局的风险吗？ 孩子们。还有一个问题是，报告的风险是否会增加 在不良分娩结局中，是由于受到其他因素的干扰。 这项研究使用了一个基于人口的瑞典数据集，数据集超过 从1983年到1987年出生的50万人，除了人口统计 特征包括有关医疗和怀孕的信息 并发症、不孕史、生育史以及 抽烟。这是一个独特的数据集，我们知道有任何类似的 美国基于人口的信息。 已经开发并提交了几份手稿，其中两份是 目前正在出版中。

There has been a marked increase in first births among women age 30 or more in th 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 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 500,00 births from 1983 to 1987, which in addition to demographic characteristics include information on medical and pregnancy complications, history of infertility reproductive history, as well as smoking. This is a unique data set and we are aware of any comparable population based information in the United States. Several manuscripts have been developed and submitted and two are currently in press.