目的探讨反向配比设计在流行病学研究中的应用。
Objective To explore the application of counter-matching design in epidemiological research.
方法以评价基因-环境交互作用的乳腺癌病因学研究为实例，介绍反向配比的设计方法和统计分析方法。
Methods Through elaboration of the study about gene-environment interactions in the etiology of breast cancer, methodology regarding counter-matching design and statistic methods was introduced.
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