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。
Objective to demonstrate, by case study, how to analyze the hospital data through the statistical methods in observational studies.
目的通过个案分析，说明如何采用观察性研究的方法对医院资料进行统计分析。
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