病例一对照研究,是流行病学研究方法之一,主要适用于病因未明疾病的病因探索。现已广泛用于现场和临床。病例一对照研究的设计原理比较简单。选定一定数量病例和对照者,调查他们过去曾否暴露于某种可疑病因及其暴露程度。如果病例组暴露于该因素者的比例 Case-control study is one of the epidemiological methods, mainly for etiology of unexplained disease. Is now widely used in the field and clinical. Case-control study design principle is relatively simple. A number of cases and controls were selected to investigate whether they had previously been exposed to a suspicious cause and their level of exposure. If the case group is exposed to the proportion of those factors