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流行病学的主要任务是探索“暴露”某因素与“某病”(或生理异常)之间的因果联系。正确地收集人、时间、地点三个方面的资料,用来分析在厂矿企业内疾病发生的频率和分布,在时间上是否有不同的变化,各车间、各工种间的发病情况有何不同?患者的年龄、性别,婚姻及经济状况如何?根据生物学知识和现掌握的可能因素同已经提出的假设联系起来进行思索和观察,就有可能构成新的假设,再收集更多事实,对这一新的假设进行验证,这样不断反复深入探索,就能进一步阐明环境与疾病之间的因果联系,充实和丰富现有的知识。
The main task of epidemiology is to explore the causal link between a factor that “exposes” to a “disease” (or physiological abnormality). The correct collection of information on people, time and place, to analyze the frequency and distribution of diseases in factories and mines, whether there are different changes in time, the workshop, the incidence of different types of workers? What is the patient’s age, gender, marital status, and financial status? Thinking and looking at the biological hypotheses and available factors linked to the hypotheses that have been put forward may create new hypotheses, gather more facts, A new hypothesis to verify, so continue to explore in depth, will be able to further clarify the causal link between environment and disease, enrich and enrich the existing knowledge.