We randomly selected 806 children under 6 years of age from 45 primary anganwadi (childcare) centres in Chandigarh, Punjab, India, that were chosen through multistage stratified randomsampling.
Multistage stratified randomsampling was conducted an interview survey in status of illness for children under 2 years old.
采用多阶段分层随机抽样法对2岁以下儿童进行疾病状况询问调查。
3
Methods: By using questionnaires with multistage stratified random cluster sampling method, 726 valid questionnaires of 800 were backed from the university students in 4 universities in Dalian city.