Nationwide survey on iodine nutritional status and thyroid function in Japanese adults.

There are several reports on an increasing trend in urinary iodine excretion with age [ 36 - 38 ], however, the exact reasons other than dietary habits of iodine intake are not clear.

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As an overall trend, their distribution was similar to the pattern of mUIC in children determined by our previous nationwide survey [ 16 ]; however, the association of a higher prevalence of thyroid dysfunction and ThAb positivity was not apparent in areas of high iodine intake.

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