在美国，叶酸被加到谷类和面粉类产品中，结果出生缺陷儿的比率有所降低。
In the US, folic acid is added to cereal and flour products and rates of birth defects have dropped as a result.
方法采用COX回归模型对广西2000年出生的围产儿1075例(包括出生缺陷儿317例和正常对照儿758例)进行干预模式拟合。
Methods: Intervention modeling was carried out on 1075 perinatals (317 cases with birth defects, 758 cases without birth defects as control) born in Guangxi province in 2000 with COX regression model.
前言：目的：通过分析导致围产儿出生缺陷的相关因素，探讨预防和降低缺陷儿出生的措施。方法：对我县4年间出生缺陷儿母亲的病历资料进行回顾性分析。
Objective: to discuss the measures on how to prevent and reduce the birth of disfigured babies by means of analyzing the interrelated factors leading to the birth of disfigured perinatal infants.
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