Iodine nutritional status of children aged 8 - 10 and pregnant women in Zhaoyuan City of Shandong Province
10.3760/cma.j.cn231583-20221021-00348
- VernacularTitle:山东省招远市8 ~ 10岁儿童和孕妇碘营养状况调查
- Author:
Guigang LI
1
;
Wei LI
;
Yue LI
;
Yujun QIN
;
Lu WANG
Author Information
1. 山东省招远市疾病预防控制中心慢性病与地方病防制科，招远 265400
- Keywords:
Child;
Pregnant women;
Iodine nutritional status;
Goiter rate
- From:
Chinese Journal of Endemiology
2023;42(12):951-956
- CountryChina
- Language:Chinese
-
Abstract:
Objective:To learn about the iodine nutritional status of children aged 8 - 10 and pregnant women in Zhaoyuan City of Shandong Province, and to provide a basis for prevention and control of iodine deficiency disorders in the future.Methods:In 2008 and 2021, a census method was used to collect drinking water samples from all 724 villages (neighbourhood committee) in Zhaoyuan City. In 2018 and 2022, a multi-stage cluster random sampling method was used to investigate the daily per capita salt intake of residents. From 2017 to 2022, multi-stage random sampling method was used to collect household salt and urine samples from children aged 8 - 10 and pregnant women. Among them, thyroid volume tests were conducted on the sampled children in 2017, 2019, 2020 and 2022, and iodine supplementation surveys were conducted on the sampled pregnant women in 2019 - 2022. The iodine content in water was determined by As 3+-Ce 4+ catalytic spectrophotometry using ammonium persulfate digestion. The iodine content in potassium iodate salt was determined by direct titration method in "General Test Method in Salt Industry-Determination of Iodine" (GB/T 13025.7-2012). And other fortified iodized salt, unqualified iodized salt and non-iodized salt were retested using the redox titration method. Urinary iodine was determined by "Determination of iodine in urine - Part 1: As 3+-Ce 4+ catalytic spectrophotometry" (WS/T 107.1-2016). The children's thyroid gland was examined by using DP-2200Plus fully digital portable ultrasound instrument and 75L38EB ultrasound probe, and the goiter rate was calculated. Results:The median water iodine levels in Zhaoyuan City in 2008 and 2021 were 5.71 and 1.30 μg/L, respectively. The daily per capita salt intake of residents in 2018 and 2022 was 9.36 and 7.83 g, respectively. It is estimated that the per capita iodine intake in 2018 was (180.64 ± 71.00) μg/d and in 2022 was (124.25 ± 72.23) μg/d. From 2017 to 2022, the consumption rate of qualified iodized salt in both children and pregnant women was less than 90%; and from 2018 to 2022, the coverage rate of iodized salt was < 95%. The median urinary iodine of children was 184.00 μg/L, at an appropriate level, there was a statistically significant difference in urinary iodine content among children in different years ( H = 77.39, P < 0.001). From 2017 to 2022, the median urinary iodine of pregnant women was between 100 and 150 μg/L, there was no statistically significant difference in urinary iodine content among pregnant women in different years ( H = 5.33, P = 0.208). The goiter rate of children in 2017, 2019, 2020 and 2022 was 3.00% (24/800), there was no statistically significant difference in goiter rate among children in different years ( P = 1.000). A total of 400 pregnant women were investigated for iodine supplementation, the rate of iodine supplementation was 90.50% (362/400). Conclusions:Zhaoyuan City has reached the elimination standard for iodine deficiency disorders, but some pregnant women are at risk of iodine deficiency. Continuous monitoring and attention should be paid to the iodine nutritional status of pregnant women.
