Objective To describe the epidemiological features and dynamic trends of neural tube defects(NTDs),including anencephaly,spina bifida and encephalocele.

• 目的利用2000-01~2004-12期间山西省出生缺陷监测网收集的资料,描述围产儿无脑、脊柱裂和脑膨出3种神经管缺陷(NTDs)的流行病学特征及其动态变化趋势。