一、概念在病因学研究中,研究者常常关心所研究疾病在多大程度上与某一因素有关。一个重要的,但是尚未被广泛使用的指标就是归因危险性(attributable risk简称AR)。它的基本含意是:暴露于某一因素的人群归因于某因素的疾病率(发病率、死亡率)。它的基本计算方法是:暴露人群疾病率(Ie)和非暴露人群相应的率(Io)之差,即AR=Ie-Io。例如表1资料中归因于重度吸烟(25支以上/日)的肺癌死亡 I. Concepts In etiological studies, researchers often care about the extent to which a disease is related to a certain factor. An important, but not widely used, indicator is attributable risk (AR). Its basic implication is that the population exposed to a certain factor is attributed to the disease rate (morbidity, mortality) of a certain factor. Its basic calculation method is: the difference between the disease rate (Ie) of the exposed population and the corresponding rate (Io) of the non-exposed population, ie, AR=Ie-Io. For example, lung cancer deaths attributable to severe smoking (25 or more per day) in Table 1