Field Epidemiological Investigation
An investigation on iodine nutritional status of children in Yunnan Province before and after adjustment of iodine content in edible salt
Anwei Wang, Wenli Huang, Feng Ye, Haitao Zhang, Yuxi Guo, Kailian Huang, Zhaoxiang Li, Rongji Cao, Changyan Peng, Jiaguo Li, Hesong Wu, Lin Yang, Haowei Zhang
Published 2018-01-20
Cite as Chin J Endemiol, 2018, 37(1): 49-53. DOI: 10.3760/cma.j.issn.2095-4255.2018.01.011
Abstract
ObjectiveTo understand the situation of iodine deficiency disorders and iodine nutrition of children in Yunnan Province after the implementation of new standard of salt iodine, and provide the basic data for prevention and control of iodine deficiency disorders.
MethodsUsing multistage sampling method, Yunnan provincial evaluations for iodine deficiency disorders elimination were carried out. According to the comparative analysis of 2010 (pre-adjustment) and 2015 (post-adjustment) evaluation results, the changes of the median of salt iodine, the coverage rate of iodized salt, the qualified rate of iodized salt, the rate of qualified iodized salt consumption, goiter rate of school children aged 8- 10 and the median of urinary iodine were evaluated. Salt iodine was tested using the "Salt Industry General Test Method for Determination of Iodine" (GB/T 13025.7-1999); thyroid volume examination of children using B-scan ultrasonography, thyroid volume calculation and enlargement judgment using "Diagnostic Criteria for Endemic Goiter" (WS 276-2007); and urinary iodine detection using "Urinary Iodine Arsenic Cerium Catalytic Spectrophotometry" (WS/T 107-2006).
ResultsThe medians of salt iodine in 2010 and 2015 were 30.6 and 22.4 mg/kg, respectively, the difference was statistically significant (U= 317 503.50, P < 0.01). The coverage rates of iodized salt in 2010 and 2015 were 99.6% (1 681/1 688) and 98.9% (2 592/2 622), the qualified rates ofiodized salt were 98.6% (1 657/1 681) and 89.7% (2 325/2 592), and the rates of qualified iodized salt consumption were 98.2% (1 657/1 688) and 88.7% (2 325/2 622), and the differences were statistically significant (χ2= 6.42, 125.11, 130.18, P < 0.01); the rates of children goiter in 2010 and 2015 were 0.8% (25/3 272) and 1.4% (44/3 245), respectively; the medians of urinary iodine of children were 289.0 and 157.3 μg/L, respectively, the difference was statistically significant (U= 1 121 669.50, P < 0.01).
ConclusionAfter decreasing of salt iodine level starting from 2012 in Yunnan Province, the children iodine nutrition condition is in a more proper level.
Key words:
Iodine; Salts; Urine; Nutrition assessment
Contributor Information
Anwei Wang
Department for Endemic Diseases Control and Prevention, Yunnan Institute for Endemic Diseases Control and Prevention, Dali 671000, China
Wenli Huang
Department for Endemic Diseases Control and Prevention, Yunnan Institute for Endemic Diseases Control and Prevention, Dali 671000, China
Feng Ye
Department for Endemic Diseases Control and Prevention, Yunnan Institute for Endemic Diseases Control and Prevention, Dali 671000, China
Haitao Zhang
Department for Endemic Diseases Control and Prevention, Yunnan Institute for Endemic Diseases Control and Prevention, Dali 671000, China
Yuxi Guo
Department for Endemic Diseases Control and Prevention, Yunnan Institute for Endemic Diseases Control and Prevention, Dali 671000, China
Kailian Huang
Department for Endemic Diseases Control and Prevention, Yunnan Institute for Endemic Diseases Control and Prevention, Dali 671000, China
Zhaoxiang Li
Department for Endemic Diseases Control and Prevention, Yunnan Institute for Endemic Diseases Control and Prevention, Dali 671000, China
Rongji Cao
Department for Endemic Diseases Control and Prevention, Yunnan Institute for Endemic Diseases Control and Prevention, Dali 671000, China
Changyan Peng
Department for Endemic Diseases Control and Prevention, Yunnan Institute for Endemic Diseases Control and Prevention, Dali 671000, China
Jiaguo Li
Department for Endemic Diseases Control and Prevention, Yunnan Institute for Endemic Diseases Control and Prevention, Dali 671000, China
Hesong Wu
Department for Endemic Diseases Control and Prevention, Yunnan Institute for Endemic Diseases Control and Prevention, Dali 671000, China
Lin Yang
Department for Endemic Diseases Control and Prevention, Yunnan Institute for Endemic Diseases Control and Prevention, Dali 671000, China
Haowei Zhang
Department for Endemic Diseases Control and Prevention, Yunnan Institute for Endemic Diseases Control and Prevention, Dali 671000, China