Methods Random sampling investigation was carried out by self-administering and anonymous questionnaire among college students in Henan.
方法采用不记名自填问卷方式，对河南在校大学生进行随机抽样调查。
Methods General investigation was adopted to understand the water supply situation in rural areas and stratified random sampling was used to monitor the water quality.
方法按照相关调查表要求，对农村供水情况进行普查，供水水质采用分层随机抽样的方法进行监测。
DESIGN: a stratified random cluster sampling investigation.
设计：分层整群抽样调查。
Methods an investigation was conducted through asking by random sampling the nursing staff to answer the questionnaires distributed to them.
方法采取随机抽样填写发放的问卷的方式进行调查。
Methods: The residents lived in two residential neighborhoods from an industrial and a cultural district were selected as objects of epidemic investigation by random sampling.
方法随机抽样以沈阳市区两个街道的常住居民为调查对象，进行有关哮喘的问卷调查，对疑诊患者行肺功能检查。
METHODS: a total of 283 families were investigated by random sampling, and the results of investigation were analyzed statistically.
方法采用非概率随机抽样方法，选取283户家庭进行调查，并对调查结果进行统计、分析。
Methods an investigation was made 1 000 old people aged 60 and upwards by random sampling and calling at the house.
方法采用整群随机抽样并进行入户调查的方法，对1 000名60岁及以上老年人进行了调查。
Methods Cluster random sampling was used for investigation of 39 villages selected from 13 counties.
方法采用分层整群随机抽样的方法，对13个中签县市39个村(点)进行调查。
Methods Stratified random cluster sampling was applied to conduct the investigation using pre-designed and tested questionnaire.
方法采用分层随机整群抽样方法，对疟史进行问卷调查。
Methods the investigation on the present status of iodine deficiency with PPS random sampling was performed in every municipality or county in Ningxia.
方法宁夏各市县均采用PPS抽样方法对碘缺乏病现状进行了调查。
Methods the investigation on the present status of iodine deficiency with PPS random sampling was performed in every municipality or county in Ningxia.
方法宁夏各市县均采用PPS抽样方法对碘缺乏病现状进行了调查。
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