人类在胚胎期和出生后两岁以内,由于碘缺乏和甲状腺激素不足,对脑细胞的增殖,脑生化功能的成熟,智能的发育和体格的发育有一定的影响。据有关文献报道,在碘缺乏地区正常儿童中有相当数量智力较差者。灵川、那坡、东兰、蒙山、马山五个县是我区(省)碘缺乏严重流行区,防治前地甲病患病率为27.27～75.30%,于1966年至1978年在五 Human embryonic and postnatal two years old, due to lack of iodine and lack of thyroid hormone, the proliferation of brain cells, brain biochemical functions mature, intelligent development and physical development have a certain impact. According to the relevant literature, there are a considerable number of people with mental retardation in normal children with iodine deficiency. Lingchuan, Napo, Donglan, Mengshan, Masan five counties is a serious epidemic of iodine deficiency in our district (province), the prevalence of endemic A to P before 27.27 ~ 75.30%, from 1966 to 1978 in Fives