Atopic Dermatitis in 3 to 6 years old children populated in the different communities.

The prevalence of AD ordered by the distance from the core urban to the rural communities surveyed in Shanghai.*P value refers to the prevalence of each community compared with the prevalence of 1XT.

以上海调研的核心城区至乡村社区的距离为排序依据的阿尔茨海默病（AD）患病率。*P值为各社区患病率与1XT患病率的对比结果。