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1资料与方法1.1抽样方法按照国家卫生计生委及国家地病中心要求,抽取我省辖区内1/3的县(市、区)做为项目监测县。项目监测县(市、区)即25个县(市、区)及长白山管委会,其中长白山管委会做为安图县的一个监测乡进行。每个监测县按东、西、南、北、中划分5个抽样片区,在每个片区各随机抽取1个乡(镇)/街道(至少包括1个街道),每个乡(镇)/街道各抽取1所小学
1 Materials and Methods 1.1 Sampling Methods According to the requirements of the National Health and Family Planning Commission and the National Center for Disease Control, 1/3 counties (cities and districts) within the jurisdiction of our province were selected as project monitoring counties. Project Monitoring Counties (cities, districts) are 25 counties (cities and districts) and Changbai Mountain Management Committee, of which the Changbai Mountain Management Committee is a monitoring township in Antu County. Each monitoring county is divided into five sample areas by East, West, South, North and North, and each area randomly selects 1 township (town) / street (including at least 1 street) Each street draws a primary school