本文系作者在美国华盛顿大学流行病学系进修期间,采用美国1980年全国生育抽样调查资料,分析了青少年时期妊娠并分娩活婴与再次分娩极低出生体重(<1500 g)婴儿的关系.选样及分析是在华盛顿大学计算机中心的主机上完成的. 根据产妇分娩头胎的年龄将产妇分为两组:20岁以前分娩头胎活婴者为暴露组;20岁以后分娩头胎活婴者为非暴露组.产妇头胎分娩的年龄,由头胎分娩的年月减去产妇本人的出生年月而求得. 本次将1 393名分娩过单胎活婴的产 In this study, the authors used the National Fertility Survey of the United States 1980 to analyze the relationship between adolescent pregnancy and childbirth and reivery with very low birth weight (<1500 g) during the study period at the Department of Epidemiology, Washington University. The sample and analysis were done on the mainframe at the Washington University Computer Center, which divided the mothers into two groups based on the age at which the mother gave birth to the first child: the first child born before the age of 20 was the exposed child; the first child born after the age of 20 gave birth to the first child Were non-exposed group.The age of maternal first childbirth was calculated by subtracting the date of birth of the maternal from the date of birth of the first child.This time, 1 393 childbirths