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职业人群回顾性定群研究也称回顾性队列研究,是以一个范围明确的人群为对象,根据已掌握的历史记录,将队列成员按暴露经历分组,以过去某个时点作为观察的起始时间,并以建立队列开始追踪到过去某个时点或到当前为止这段时间作为随访时期,也可把随访延伸到未来,回顾追溯队列成员在此期间内的死
Retrospective study of occupational groups Study also known as retrospective cohort study of retrospective cohort, is based on a well-defined population as the object, based on the available history, the members of the cohort were grouped according to exposure history, at some point in the past as the beginning of observation Time, and the establishment of the queue began to track some time in the past or until now as a period of time as a follow-up period, the follow-up may also be extended to the future, retrospective queue members died during this period