There are three main types of descriptive methods: observational methods, case-study methods and survey methods.
描述性研究法一共分为三类：观察法，案例分析法以及调研法。
Methods Epidemiological case study and descriptive statistical analysis were conducted.
方法采用流行病学方法进行个案调查和描述统计分析。
Methods Epidemiological case study and descriptive statistical analysis were conducted.
方法采用流行病学方法进行个案调查和描述统计分析。
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