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１９９５年４月，内蒙古自治区对所辖的１２个盟（市）随机抽取２２个县（旗、区、下同），在每个调查县随机抽取１个乡（镇、街道、苏木，下同），在每个调查乡采用批质量保证抽样方法，确定所调查儿童所在的村（居民委员会，下同），根据每个村要调查的儿童数，随机确定在村
In April 1995, Inner Mongolia Autonomous Region randomly selected 22 counties (flags, districts and the same below) from 12 allied (cities) under its jurisdiction, and randomly selected one township (town, street, hematoxylin, In the same way, a sampling method of batch quality assurance was adopted in each survey area to determine the village where the children under investigation (neighborhood committees, the same below). Based on the number of children to be investigated in each village,