Using the method combining systemic sampling and cluster sampling together, we select 972 persons to be the inquisition object, collecting 890 valid questionnaire, with 91.6% efficiency .
调查采用分层整群抽样的方法，选取972人作为调查对象，得有效调查问卷890份，有效率为91.6%。
All patients suffering cancer of these two groups underwent systemic mediastinal and hilar lymph node sampling.
比较两组手术时间、术后住院时间、术后留置引流管时间、清扫的淋巴结总数等指标。
All patients suffering cancer of these two groups underwent systemic mediastinal and hilar lymph node sampling.
比较两组手术时间、术后住院时间、术后留置引流管时间、清扫的淋巴结总数等指标。
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