Iodine status of adults in Taiwan 2005-2008, 5 years after the cessation of mandatory salt iodization

Kam Tsun Tang, Fan Fen Wang, Wen Harn Pan, Jiunn Diann Lin, Ging Shing Won, Wing Keung Chau, Hong Da Lin, Yao Te Hsieh

Research output: Contribution to journalArticle

10 Citations (Scopus)

Abstract

Background/Purpose: Iodine deficiency causes a broad spectrum of disorders across all ages. Mandatory salt iodization in Taiwan successfully reduced the goiter rate from 21.6% to 4.3% in schoolchildren surveyed in 1971. The program continued until 2003 when salt iodization was changed from mandatory to voluntary. The purpose of this study was to investigate the iodine status of Taiwanese individuals after the change in the iodine policy. Methods: Urinary iodine (UI) was measured in samples from adults in the Nutrition and Health Survey in Taiwan 2005-2008. Results: The median UI level was 100μg/L, and the percentage of populations with UI levels below 100μg/L and 50μg/L was 50.1% and 15.1%, respectively, indicating that the iodine status was borderline adequate. Men had a higher UI level than women (102μg/L vs. 98μg/L, p=0.003), and older individuals (age > 60 years) had a lower UI level than younger people, particularly in women. The iodine status of the population <50 years was sufficient, but it was insufficient in older groups. Mild iodine insufficiency was noted in all areas of Taiwan except the Southern area and Penghu islands, with the lowest UI level of 79μg/L in the Mountain area. Although the UI level of women of childbearing age (19-44 years) was 103μg/L, there may be a risk of iodine deficiency during pregnancy. Conclusion: The iodine nutrition of the Taiwanese population in 2005-2008 was borderline adequate, with insufficiency in some subgroups. Further monitoring of the iodine status is necessary.

Original languageEnglish
JournalJournal of the Formosan Medical Association = Taiwan yi zhi
DOIs
Publication statusAccepted/In press - Jan 25 2015

Fingerprint

Taiwan
Iodine
Salts
Population
Nutrition Surveys
Goiter
Health Surveys
Islands

Keywords

  • Iodine
  • Iodized salt
  • Nutrition survey
  • Taiwan
  • Thyroid gland

ASJC Scopus subject areas

  • Medicine(all)

Cite this

Iodine status of adults in Taiwan 2005-2008, 5 years after the cessation of mandatory salt iodization. / Tang, Kam Tsun; Wang, Fan Fen; Pan, Wen Harn; Lin, Jiunn Diann; Won, Ging Shing; Chau, Wing Keung; Lin, Hong Da; Hsieh, Yao Te.

In: Journal of the Formosan Medical Association = Taiwan yi zhi, 25.01.2015.

Research output: Contribution to journalArticle

Tang, Kam Tsun ; Wang, Fan Fen ; Pan, Wen Harn ; Lin, Jiunn Diann ; Won, Ging Shing ; Chau, Wing Keung ; Lin, Hong Da ; Hsieh, Yao Te. / Iodine status of adults in Taiwan 2005-2008, 5 years after the cessation of mandatory salt iodization. In: Journal of the Formosan Medical Association = Taiwan yi zhi. 2015.
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abstract = "Background/Purpose: Iodine deficiency causes a broad spectrum of disorders across all ages. Mandatory salt iodization in Taiwan successfully reduced the goiter rate from 21.6{\%} to 4.3{\%} in schoolchildren surveyed in 1971. The program continued until 2003 when salt iodization was changed from mandatory to voluntary. The purpose of this study was to investigate the iodine status of Taiwanese individuals after the change in the iodine policy. Methods: Urinary iodine (UI) was measured in samples from adults in the Nutrition and Health Survey in Taiwan 2005-2008. Results: The median UI level was 100μg/L, and the percentage of populations with UI levels below 100μg/L and 50μg/L was 50.1{\%} and 15.1{\%}, respectively, indicating that the iodine status was borderline adequate. Men had a higher UI level than women (102μg/L vs. 98μg/L, p=0.003), and older individuals (age > 60 years) had a lower UI level than younger people, particularly in women. The iodine status of the population <50 years was sufficient, but it was insufficient in older groups. Mild iodine insufficiency was noted in all areas of Taiwan except the Southern area and Penghu islands, with the lowest UI level of 79μg/L in the Mountain area. Although the UI level of women of childbearing age (19-44 years) was 103μg/L, there may be a risk of iodine deficiency during pregnancy. Conclusion: The iodine nutrition of the Taiwanese population in 2005-2008 was borderline adequate, with insufficiency in some subgroups. Further monitoring of the iodine status is necessary.",
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