社区干预试验:是选择不同的受试社区(或比社区小的群体)分组,分别对其施以不同的干预措施,目的在于评价某项干预措施效果或验证病因假设。即社区干预试验是以社区为单位分配研究人员到试验组或对照组,设计的是社区范围基础上的干预。如学校等进行碘盐的干预、某一地区自来水加氟等干预。 Community Intervention Trial: Different groups are selected from different communities (or smaller groups), and different interventions are given to evaluate the effect of an intervention or to verify the etiological assumptions. In other words, community intervention trials allocate researchers to test or control groups on a community-by-community basis and design community-based interventions. Such as schools, such as the intervention of iodized salt, water fluoride and other areas of intervention.