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Environmental Health and Preventive Medicine
Published in: Environmental Health and Preventive Medicine 5/2014

01-09-2014 | Regular Article

High iodine intake by preschool children in Miyagi prefecture, Japan

Authors: Haruo Nakatsuka, Takao Watanabe, Shinichiro Shimbo, Hideyuki Sawatari, Kana Izumi, Kozue Yaginuma-Sakurai, Masayuki Ikeda

Published in: Environmental Health and Preventive Medicine | Issue 5/2014

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Abstract

Objectives

Standard Tables of Food Composition in Japan 2010 (FCT) remain incomplete for iodine contents. This survey was initiated to develop a method to cope with this shortage and to find daily iodine intake of preschool children in Japan.

Methods

Data were available for one-day food intake for 296 3- to 6-year-old children (the total cases). 128 samples (the selected cases) were analyzed by ICP-MS for iodine (the measured values). Iodine intake was also calculated using FCT assuming that iodine contents in missing items were zero (the calculated values).

Results

Measured and calculated values for the selected 125 cases (after exclusion of 3 extreme cases) gave geometric means (GM) of 117.6 and 101.8 μg/day. The measured/calculated ratio in GM, 117.6/101.8 = 1.155, was applied to the calculated values for total 296 cases to estimate iodine intake (the estimated values). GM for the estimated value was 175.2 μg/day and it was 8.93 μg/kg/day after adjustment for body weight for 296 children. There was no significant difference between boys and girls.

Discussion

The GM values for both the measured and estimated values (n = 125 pairs) were 117.6 μg/day. The agreement suggested that the factor employed, 1.155, was proper and adequate. Literature survey suggested that values on a body weight basis were comparable between the children and adults in Japan. The levels were higher than levels in east Asian countries.

Conclusions

A correction method was developed for estimation of daily dietary iodine intake. The iodine intake level for preschoolers was comparable to levels for adult population.
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Metadata
Title
High iodine intake by preschool children in Miyagi prefecture, Japan
Authors
Haruo Nakatsuka
Takao Watanabe
Shinichiro Shimbo
Hideyuki Sawatari
Kana Izumi
Kozue Yaginuma-Sakurai
Masayuki Ikeda
Publication date
01-09-2014
Publisher
Springer Japan
Published in
Environmental Health and Preventive Medicine / Issue 5/2014
Print ISSN: 1342-078X
Electronic ISSN: 1347-4715
DOI
https://doi.org/10.1007/s12199-014-0394-6

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