In the process of data collection, strictly implement the "three examinations", that is, immediate inspection is completed the questionnaire, every day of the returned questionnaires by hand uniform inspection, quality control personnel checks. 在收集数据的过程中,严格执行三查,即问卷完成后即时检查、每天由专人对回收的问卷统一检查、质控人员抽查。