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 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 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 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。
应用推荐