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1.引言回顾性调查和前瞻性调查是两种最重要的流行病学调查方法,流行病学家用它来进行病因的分析研究。两种研究方法各自的出发点明显不同。在前瞻性调查中,以一组暴露于被怀疑为增大(或减少)某病危险性的因素的人与
1. INTRODUCTION Retrospective investigations and prospective investigations are two of the most important epidemiological investigation methods used by epidemiologists to conduct etiological analysis studies. The starting point of the two research methods is obviously different. In a prospective survey, a group of people were exposed to factors suspected of increasing (or decreasing) the risk of a disease.