The incidence of NTD in Tianjin was 2.42 per 1000, among which there were 106 cases of anencephaly (45.9%), 95 cases of spina bifida (41.1%), and 30 cases of NTD complicated with deformities of other systems (13.0%).

• 在231例神经管畸形中；无脑儿106例占45.；9%25(内部组成比用%25)；脊柱裂95例占41