Surveillance results of iodine nutrition among school children aged 8-10 years after implementing the new standard of salt iodine content in Baoshan city
LI Yan-ping1, HUANG Dong-sheng1, TANG Xian-yan2, ZHAO Ming1,MA Yun-liang1
1. Baoshan Prefecture Center for Disease Control and Prevention, Baoshan, Yunnan 678000, China; 2. Department of Epidemiology and Biostatistics, School of Public Health, Guangxi Medical University, Nanning, Guangxi 530021, China
Abstract：Objective To investigate the iodine nutrition condition among school children aged 8-10 years after implementation of the new standard of salt iodine content in Baoshan city, and to provide references for prevention and control of iodine deficiency disorders. Methods According to Surveillance Program on Iodine Deficiency Disorders in Yunan province, a stratified cluster random sampling method was used to select 414 school children aged 8-10 years in Tengcheng city and Longyang district in 2016. The method for measuring iodine in urine by As3+-Ce4+ catalytic spectrophotometry was used for determining the urine iodine, and thyroid volumes in children were detected by B ultrasound. At the same time, the methods of oxidation-reduction and direct titration were used to detect the iodine content of edible salt collected from the children’s homes. SPSS software was employed to analyze the level of urine iodine and thyroid abnormal situation in the children and iodine content of edible salt in their families. Results A total of 414 children aged 8-10 years in Baoshan city in 2016 were surveyed, and 414 urine samples were detected. The median urine iodine (MUI) was 250.60 μg/L (195.86 μg/L-329.76 μg/L). The MUI in Tengchong city and Longyang district was 258.26 μg/L and 250.27 μg/L respectively, without statistically significant differences(Z=-1.071,P=0.284). The MUI was higher in urban children than in rural ones, with a statistically significant difference (Z=-3.303, P=0.001). A total of 414 samples of edible salt were detected, and the median salt iodine (MSI) was 23.26 mg/kg. The MSI was higher in Tengchong city than in Longyang district (25.38 mg/kg vs. 20.07 mg/kg), with a statistically significant difference (Z=-12.049,P<0.001). The coverage rate of iodized salt, the rate of non-iodized salt, the utilization rate of qualified iodized salt and the qualified rate of iodized salt were 94.44% (391/414), 5.56% (23/414), 81.40% (337/414) and 86.19% (337/391) respectively. The coverage rate of iodized salt, the utilization rate of qualified iodized salt and the qualified rate of iodized salt were higher in Tengchong city than in Longyang district (χ2=10.668, χ2=46.087, χ2=35.542, all P<0.001), while the rate of non-iodized salt was higher in Longyang district than in Tengchong city(χ2=9.616,P=0.002).The thyrocele rate was 2.17% (9/414), and the rate was higher in Longyang district than in Tengchong city (4.39% vs. 0.00%, χ2=7.249, P=0.006). The detection rate of thyroid nodule was 6.28%(26/414), and this rate was higher in Longyang district than in Tengchong city (12.68% vs. 0.00%, χ2=321.498, P<0.001). The detection rate of thyroid nodule in 8-10 years old children were 2%, 3.52% and 11.05% (χ2=11.588, P=0.003). Conclusions Urine iodine of the school children aged 8-10 years in Tengchong city and Longyang district of Baoshan city was slightly more than the adequate level, but remained at an acceptable level. It is necessary to further strengthen the surveillance of iodine nutrition among the key population, especially in children
李艳萍, 黄东升, 唐咸艳, 赵明, 马云良. 新国标盐碘含量实施下保山市8~10岁学龄儿童碘营养监测结果分析[J]. 实用预防医学, 2019, 26(8): 940-943.
LI Yan-ping, HUANG Dong-sheng, TANG Xian-yan, ZHAO Ming,MA Yun-liang. Surveillance results of iodine nutrition among school children aged 8-10 years after implementing the new standard of salt iodine content in Baoshan city. , 2019, 26(8): 940-943.
2019, Vol. 26 
