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.
方法对海淀区常住人口中发生的SARS病例进行个案调查和描述性分析。
Methods Each SARS case was interviewed by trained investigator using standardized questionnaire followed a descriptive analysis.
方法对社区人群采用多阶段分层整群随机抽样方法抽取研究对象，进行个案调查和血清学检测。
Methods Subjects were collected from community population by stratified multi-stage cluster sampling method. The data gathered from case investigation and serological detection.
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