Abstract
杨晓亮,叶荣伟.早产流行趋势及影响因素研究进展[J].Chinese journal of Epidemiology,2009,30(7):747-750
早产流行趋势及影响因素研究进展
Research on the natural history of acquired immunedeficiency
Received:September 17, 2008  
DOI：10.3760/cma.j.issn.0254-6450.2009.07.026
KeyWord: 早产  流行趋势  影响因素
English Key Word: Preterm birth  Epidemic仃end  Influencing factors
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Author NameAffiliationE-mail
FANG Xiaoliang Institute of Reproductive and Child Heath, Peking Unwersity, Beijing 100191, China  
YE Rongwei Institute of Reproductive and Child Heath, Peking Unwersity, Beijing 100191, China yerw@bjmu.edu.cn 
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Abstract:
      早产是围产保健工作面临的一项严重临床问题，根据世界卫生组织的定义，早产是指从孕妇末次月经周期首日算起，孕龄<37周或259天的分娩。按分娩时孕龄大小，早产通常分为：轻度早产(34周～36周)，占全部早产的60％～70％；中度早产(32周～33周)，约占20％；重度早产(28周～3l周)，约占15％；极度早产(20周～27周)，约占5％。
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