1) historical cohort study
历史性队列研究
1.
A historical cohort study was carried out by comparing levels of sero antibodies against Legionella pneumnophila of 414 workers who were taken as the exposure group under central air conditioning systems with 414 controls from the general poputation as the non exposure group.
方法 随机抽取北京市 4家大饭店 414位工作人员作为暴露人群和 414位对照者作为对照人群 ,用历史性队列研究方法 ,针对中央空调系统这一暴露因素进行血清流行病学研究。
2.
【Method】 52 687 puerperals and their 53 324 infants were researched,the relative risk(RR) and the population attributable risk(PAR) of the ten exposure factors were calculated with historical cohort study.
【方法】以1994~2002年在广州市荔湾区分娩的52687例产妇和53324例围产儿为研究对象,采用历史性队列研究的方法,分别计算10项暴露因素的相对危险度(relativerisk,RR)和人群归因危险度百分比(populationattributablerisk,PAR)。
3.
A historical cohort study was further confirmed the risk factors of SID which were screened out by single variat and multivariate analys.
通过历史性队列研究验证儿童SID的危险因素。
2) historical research
历史性研究
3) The continuity of the study of history
历史研究延续性
4) Historic Project-based Learning
历史研究性学习
1.
Based on Multiple Intelligent Theory Middle School Historic Project-based Learning;
基于多元智能理论的中学历史研究性学习
6) research history
研究历史
1.
The research history of the family Tamaricaceae;
柽柳科(Tamaricaceae)植物的研究历史
2.
The superior species of poplar in China and abroad and their research history and our achievements in breeding are introduced in thepaper.
介绍了国内外杨树造纸材适生良种及其研究历史和我国在杨树育种方面成就;探讨了造纸用杨树新品种存在的问题;论述了杨木造纸良种的科学标准及其相互制约与优势补缺;提出了我国杨木造纸良种的分区规划方案;展望了杨树造纸适用良种的发展前景。
3.
Our country s research history of soil erosion was reviewed.
回顾了我国黄土地区土壤侵蚀研究历史。
补充资料：队列研究
队列研究
也称定群研究，是暴露与未暴露于某因素的两种人群，追踪其各自的发病结局，比较两者发病结局的差异，从而判定暴露因子与发病有无因果关联及关联大小的一种观察研究方法。
说明：补充资料仅用于学习参考，请勿用于其它任何用途。
参考词条