Methods The survey of prevalence of dental caries in group aged 12 and 15 years in Anhui province was conducted using the non-proportional, stratified, cluster sampling method.

方法对安徽省四县市的12岁及15岁儿童的龋病发病情况进行抽样调查，采用分层、不等比、多阶段整群抽样的方法。

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Methods To survey 203 poor students and 262 non-poor students by questionnaire sample in the match way, and analysis data by social science statistics software.

方法采用对偶取样方法对203名贫困生和262名非贫困生的社会支持和自我价值感进行了问卷调查，用社会科学统计软件进行数据统计。

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Methods The method of stratified cluster samping was used to survey 181 music professional college students and 183 non-music professional college students with EPQ-RSC.

方法采用分层整群抽样的方法对音乐专业181名、非音乐专业183名大学生进行艾森克人格问卷简式量表中国版（EPQ-RSC）测查。

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The survey showed an increase in the use of web-based, or non-peer-to-peer methods, during the last six months.

BBC: No decrease in illegal downloading, says BPI