Methods Using CHAID method to analyze the individual data from the 1997 national population and reproductive health survey.
方法应用CHAID方法分析1997年全国人口与生育健康调查资料。
Methods The grouped random sampling rule survey was carried out in a sample population of 8757 who lived in seaside district of Rongcheng city.
方法采用整群随机抽样方法，抽取荣成市沿海地区8757名渔民为调查对象。
Methods A population-based door-to-door caregiver survey was conducted in Beijing, Xi′an, Shanghai and Chengdu in 1998.
方法1998年在北京、西安、上海、成都四地区进行以人群为基础的照料者调查。
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