方法对1995年进行的第三次九城市7岁以下儿童的体格发育调查资料进行分析，并与1975和1985年的两次调查资料进行对比研究。
Methods Data collected from the third national survey on physical development and growth in children under seven years old conducted in 1995 were analyzed and compared with those in 1975 and 1985.
国家儿童发育研究在大范围调查数据中使用了最好的检测智商的方法。
NCDS has the best measure of general intelligence available in any large-scale survey data.
对这些母亲还进行了怀孕期间邻苯二甲酸酯调查，因为此阶段正是孩子大脑发育的最敏感阶段。
The mothers were tested for phthalates during pregnancy, the most sensitive time for a child's brain development.
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