方法资料来源于“中美预防出生缺陷和残疾合作项目”以人群为基础的出生缺陷监测系统。
Methods the data was obtained from the birth defects surveillance system of China-US collaborate project on prevention of birth defects and disability.
这些孩子在1997-2003年之间出生，并且参加了国家出生缺陷预防研究，这项研究从10个州的10个出生缺陷监测系统中提取数据。
The children were born between 1997 and 2003 and were participants in the National Birth Defects Prevention Study, which drew data from 10 birth-defect surveillance systems in 10 states.
这些孩子在1997-2003年之间出生，并且参加了国家出生缺陷预防研究，这项研究从10个州的10个出生缺陷监测系统中提取数据。
The children were born between 1997 and 2003 and were participants in the National Birth Defects Prevention Study, which drew data from 10 birth-defect surveillance systems in 10 states.
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