Methods A cluster stratified sample of 1681 students ham Jianghan University were investigated by SDS.

方法采用分层整群抽样法抽取江汉大学1681名本科学生，采用抑郁自评量表（SDS）进行测评。

Methods a questionnaire survey was conducted to a clustered stratified sample of 1 785 children in Qingdao.

方法采取分层整群抽样的方法对青岛市1 785名儿童进行问卷调查。

Methods: a cluster random stratified sample of 394 medical college students were investigated with a SCL-90 questionnaire.

方法：采取分层整群抽样的方法抽取394名医学生进行SCL - 90症状自评量表的问卷调查。

Methods: Stratified random cluster sampling method was used to determine the survey sample.

方法：以分层随机整群抽样的方法，确定调查样本。

Methods Random sample were obtained from the whole population by multiple stratified cluster and 1 320 objects were surveyed in their own homes by questionnaires.

方法采用多阶段整群抽样和配额抽样相结合的方法，对深圳市1 320名居民进行入户问卷调查。