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Related Experiment Videos

Randomized clinical trial comparing different iodine interventions in school children.

J Zhao1, F Xu, Q Zhang

  • 1Jiangsu Provincial Center for Public Health and Diseases Control, Nanjing, China. button@990.net

Public Health Nutrition
|August 14, 1999
PubMed
Summary

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Controlled iodized salt (25 ppm) effectively addressed iodine deficiency in school children. Market-sourced salt with variable iodine content showed slower recovery, highlighting the importance of consistent iodine supplementation for thyroid health.

Area of Science:

  • Public Health
  • Nutrition Science
  • Endocrinology

Background:

  • Iodine deficiency remains a global public health concern, particularly affecting children's cognitive development and thyroid function.
  • School-aged children are a vulnerable population susceptible to the effects of inadequate iodine intake.
  • Assessing the efficacy of different iodine supplementation strategies is crucial for public health interventions.

Purpose of the Study:

  • To compare the effectiveness of three different iodine interventions in school children.
  • To evaluate the impact of controlled iodized salt versus market-sourced iodized salt and oil capsules on iodine status.

Main Methods:

  • A randomized controlled trial involving school children aged 8-10 years.
  • Three groups received: 1) researcher-provided iodized salt (25 ppm), 2) market-purchased iodized salt, or 3) market-purchased iodized salt plus iodine oil capsules.

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  • Thyroid volume, goiter prevalence, and urinary iodine levels were measured over 18 months.

    • Main Results:

    • Abnormal thyroid volumes decreased significantly by 12 months in groups receiving controlled iodized salt or iodine capsules.
    • Market-sourced iodized salt intervention showed a slower normalization of thyroid size.
    • Urinary iodine levels increased in all groups, exceeding 200 microg/L by 6 months.

    Conclusions:

    • Controlled iodized salt (25 ppm) effectively prevented iodine deficiency in school children over 18 months.
    • Market-sourced iodized salt, with variable iodine content, resulted in delayed normalization of thyroid size.
    • Consistent and adequate iodine intake is essential for maintaining normal thyroid function in children.