本文在妇女易患早产的危险因素方面重点讨论早产与围产期死亡率之间的关系。资料来自挪威医学出生登记处和中央统计局,并与美国明尼苏达州有关资料进行对比。有关早产的危险因素涉及到:种族、双生情况、早产史、既往流产史、初产妇年龄、妊娠并发症、教育与职业以及生活方式等。比较挪威人、美国明尼苏达州白人和非白人不同孕龄对单胎和多胎产累积百分数的分布与围产期死亡率之间的关系,发现前两族有较大相似性,特别是在孕36周以前。而非白人的出生累积百分数几是白人的两倍,因而美国非白人平均婴儿孕龄比白人少一周。在孕33周前分娩的虽只占全部出生的2～3%,但围产期死亡率几乎半数是极早产儿 This article focuses on the relationship between preterm birth and perinatal mortality in terms of women at risk of preterm birth. Data from the Norwegian Medical Birth Registry and the Central Bureau of Statistics, and with the United States Minnesota relevant information for comparison. The risk factors for preterm delivery include race, twins, premature births, previous abortion history, primiparous age, pregnancy complications, education and occupation, and lifestyle. Comparing the relationship between the cumulative percentages of singletons and multiple births and the perinatal mortality for Norwegians and Minnesota Minnesota at different gestational ages, the first two families were found to have greater similarity, particularly in pregnancy 36 Weeks ago. Non-whites, on the other hand, doubled the cumulative percentage of births by whites, so the average non-whites in the United States averaged one week less gestation than whites. Although only 32% of all births were delivered before 33 weeks of gestation, almost half of the perinatal mortality rate is extremely premature