许多评价职业性(或非职业性)接触的长期健康影响的流行病学研究,常用前瞻性或队列研究方法。在此类型研究中,要确定一组过去有过接触的工人,通过定期追踪随访确定年限和若干不同死因的特定死亡率。 统计学分析通常包括个人一时间分析,即SMR计算结果分析。在列队研究中使用个人一时间分析的目的是校正调查的特定年龄人群分布的干扰和换算超时 Many epidemiological studies evaluating the long-term health effects of occupational (or non-occupational) exposure have commonly used prospective or cohort studies. In this type of study, a group of past-ever exposed workers is identified to determine the number of years and the specific death rate for several different causes of death through regular follow-up. Statistical analysis usually includes a personal one-time analysis, that is, SMR calculation results. The purpose of using an individual-time analysis in a cohort study was to correct the interference and conversion time-outs of the surveyed population of a particular age