Neural tube defects; Case control study; Risk factors.

神经管畸形；病例对照研究；危险因素。

Results The incidence of neural tube defect was increased.

神经管畸形发生率增加，唇腭裂、肢体畸形减少。

Folic acid helps prevent neural tube birth defects such as spina bifida.

叶酸能帮助防止诸如脊柱裂等神经管畸形出生缺陷的发生。

The chorionic villi cannot be used to test for open neural tube defects.

但绒毛膜绒毛不能够被用于检测开放性神经管缺损。

In 100,000 births, a screening program would avent 187 neural tube defects.

在100,000婴儿中，一项筛检可避免187个神经管缺陷。