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早产是当今围产医学研究的重要内容之一。国外报道的早产发生率一直居高不下,发展中国家早产的发生率为5%～25%,发达国家为5%～10%,中国为5%～15%〔1〕。早产儿由于器官功能不成熟和免疫功能不完善,产生多种并发症致使死亡率升高。据美国疾病预防控制中心统计,2005年美国早产儿死亡率约为18.3%,中国妇幼卫生监测也报道早产
Premature labor is one of the important contents of perinatal medical research. The incidence of preterm birth reported in foreign countries has been high, the incidence of preterm birth in developing countries is 5% to 25%, 5% to 10% in developed countries, China is 5% to 15% [1]. Premature children due to immature organ function and immune dysfunction, resulting in a variety of complications led to increased mortality. According to the U.S. Centers for Disease Control and Prevention statistics, the 2005 U.S. premature mortality rate was about 18.3%, and maternal and child health surveillance in China also reported premature birth