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于 2 0 0 0年 5月至 1 0月期间 ,采用整群随机抽样的方法 ,在宁波市海曙区2 6所小学中随机抽取 6所小学 (区中心小学 1所 ,普通小学 5所 ) 1 - 4年级每年级各一个班 ,同区 49所幼儿园中随机抽取 4所幼儿园 (公办、系统办、集体、个体幼儿园各一所 )每所一个大班 ,共 1 2 0 0名
From May to October 2000, a total of 6 primary schools (1 district primary school and 5 ordinary primary schools) were randomly selected from 26 primary schools in Haishu District of Ningbo City - Grade 4 in each grade class, with a total of 1,200 kindergartens (one for each of the public, system-run, collective and individual kindergartens) in 49 kindergartens in the same district