论文部分内容阅读
1 调查点、对照点选择1.1 调查点、对照点的选择 本次调查以1996～1997年命名的70个省级卫生镇为本底,以市(县)为单位采取分层随机抽样方法共确定调查点21个,分布在16个市(县)。对照点与调查点按1:1配置,选点原则为:(1)未开展创建工作的镇;(2)其地理位置、自然条件与调查点相当;(3)以1994年为背景,其人口数、经济水平(GDP)与调查点相当。
1 Selection of survey sites and control sites 1.1 Selection of survey sites and control sites The survey was based on 70 provincial health towns named from 1996 to 1997, and was determined by stratified random sampling method in cities (counties). 21 survey sites were distributed in 16 cities (counties). The control points and survey points are 1:1, and the selection principles are: (1) towns that have not been created; (2) their geographic locations and natural conditions are equivalent to the survey points; (3) with 1994 as the background, The population and economic level (GDP) are comparable to the survey sites.