病例对照研究是最常用的分析流行病学方法,它通过比较一组患某病的人群(病例)和一组或几组未患该病的人群(对照),暴露于某个或某些可能危险因素(或保护因素)的频度,来考察这些因 Case-control studies are the most commonly used analytical epidemiological methods by comparing a group of people with a disease (case) and one or more groups of people without the disease (control) to one or more possible Risk factors (or protective factors) frequency, to examine these factors