Spot urine iodine levels below the WHO recommendation are not related to impaired thyroid function in healthy children and adolescents.

Eur J Nutr · 2021 · PMC7867514 · PMID 32390124

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a negative trendno p-value reported

In line with other surveys, our data summarize a negative trend in iodine supply for Central Europe in the last 20 years.

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Quoted from the open-access full text in Europe PMC under the licence the publisher applied. The sentence is reproduced exactly as published; the emphasis is ours.