Methods Subjects were collected from community population by stratified multi-stage cluster sampling method. The data gathered from case investigation and serological detection.
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。
The national total population was adjusted for the sampling error and investigation error.
全国数据根据抽样误差和调查误差进行了修正。
The national total population was adjusted for the sampling error and investigation error.
全国数据根据抽样误差和调查误差进行了修正。
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