Monitoring results on iodine nutrition status of children in water-borne iodine-excess areas of Hebei Province from 2018 to 2023

YIN Zhijuan; JIA Lihui; TIAN Shenqian; GAO Xuejie; XU Ning; XU Dong; MA Jing

doi:10.16835/j.cnki.1000-9817.2025269

Volume 46 Issue 9

Sep. 2025

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YIN Zhijuan, JIA Lihui, TIAN Shenqian, GAO Xuejie, XU Ning, XU Dong, MA Jing. Monitoring results on iodine nutrition status of children in water-borne iodine-excess areas of Hebei Province from 2018 to 2023[J]. CHINESE JOURNAL OF SCHOOL HEALTH, 2025, 46(9): 1252-1256. doi: 10.16835/j.cnki.1000-9817.2025269

Citation:

YIN Zhijuan, JIA Lihui, TIAN Shenqian, GAO Xuejie, XU Ning, XU Dong, MA Jing. Monitoring results on iodine nutrition status of children in water-borne iodine-excess areas of Hebei Province from 2018 to 2023[J]. CHINESE JOURNAL OF SCHOOL HEALTH, 2025, 46(9): 1252-1256. doi: 10.16835/j.cnki.1000-9817.2025269

Citation:

YIN Zhijuan, JIA Lihui, TIAN Shenqian, GAO Xuejie, XU Ning, XU Dong, MA Jing. Monitoring results on iodine nutrition status of children in water-borne iodine-excess areas of Hebei Province from 2018 to 2023[J]. CHINESE JOURNAL OF SCHOOL HEALTH, 2025, 46(9): 1252-1256. doi: 10.16835/j.cnki.1000-9817.2025269

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Monitoring results on iodine nutrition status of children in water-borne iodine-excess areas of Hebei Province from 2018 to 2023

doi: 10.16835/j.cnki.1000-9817.2025269

Institution for Endemic Disease Prevention and Control, Hebei Provincial Center for Disease Control and Prevention, Shijiazhuang 050021, Hebei Province, China

Received Date: 2025-03-03
Rev Recd Date: 2025-05-28

Available Online: 2025-10-10

Publish Date: 2025-09-25

Abstract

Abstract

Objective To investigate the iodine nutrition status of children in water-borne iodine-excess areas in Hebei Province, so as to provide references for scientific prevention and control of water-borne iodine-excess hazards. Methods From March to September each year during 2018 to 2023, a cross-sectional survey was conducted in 39 water-borne iodine-excess counties (measured in 2017) from 5 cities (Cangzhou, Hengshui, Xingtai, Handan and Langfang) in Hebei Province. The survey included the detection of iodine content in residents' drinking water, the measurement of thyroid volume in children aged 6-12, the detection of salt iodine and urinary iodine. The iodine nutrition status and water iodine distribution of 6-12 year-old children were evaluated from different perspectives such as years, gender, and age. Kruskal-Wallis H test, Mann-Whitney U test and Chi-square test were used for group comparison. Results A total of 38 755 children were surveyed from 2018 to 2023, and 1 270 drinking water samples were tested across the province. The mass volume concentration of iodine in water showed a decreasing trend over the years (Z=-30.87, P < 0.01). Among 38 470 salt samples monitored from children 's home, 24 790 were not non-iodized salt, with a non-iodized salt rate of 64.44%. A total of 31 989 urine samples were collected from children aged 8-10 years, with the median urine iodine was 245.94 μg/L. Comparing the results of urinary iodine in children from different years, the median urinary iodine from 2018 to 2023 were 328.0, 339.3, 267.8, 279.1, 291.3, 186.5 μg/L, respectively, with statistically significant differences (H=4 138.40, P < 0.01). Further pairwise comparisons showed that the median urinary iodine of children in 2023 was lower than in all other years (Z=-51.59 to -11.41, all P < 0.01). Among children aged 6-12 years, 1 150 cases of goiter were detected and the rate of goiter was 3.0%; and the goiter rates in boys and girls were 2.8% and 3.1%, with no significant difference between the sexes (χ²=2.76, P>0.05). There were significant differences in the rate of goiter among different years and ages (χ²=324.02, 191.61, both P < 0.05). Conclusions With the progress of water reform in water-borne iodine-excess areas of Hebei Province, children's iodine nutrition has reduced from excessive state to suitable state. It is necessary to continue to expand the coverage of water-based iodine reduction projects, and strengthen the monitoring of iodine nutrition status of key populations in water-borne iodine-excess areas.
- Iodine,
- Nutritional status,
- Population surveillance,
- Child

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References(28)

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