Methods Under stratified sampling, the investigation of the oral health concept and behavior were carried out using closed type questionnaire method.
方法采取分层抽样方法，分别对口腔健康观念与行为情况进行问卷调查、填写记录。
The main study instrument was the open and closed-ended questionnaire, and the following interview was also employed to gain some in-depth and supplementary data.
调查工具主要采用问卷，随后对学生访谈来获取深层信息以对定量数据进行补充。
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