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病例对照研究是分析流行病学研究的一种重要方法。它是采用回顾性调查,了解患某种疾病的病人和对照人群同各种因素之间的关系。比较两组人群中某些因素出现的频数,来判断某些因素和疾病之间联系的强度。由于病例对照研究方法简便、省人力,能在较短的时间内获得一个初步结果,所以在病因研究中被广泛应用。为了减少病例对照研究的偏性,调查前要做好周密的设计,
Case-control studies are an important method of analyzing epidemiological studies. It uses a retrospective survey to understand the relationship between the various groups of patients and controls who have a particular disease. The frequency of occurrence of some of the two groups of people was compared to determine the strength of the association between certain factors and the disease. As the case-control study is simple, provincial manpower, in a short period of time to obtain a preliminary result, so in the etiology of research is widely used. In order to reduce the bias of the case-control study, before the survey should be well-designed,