Correlations of water iodine concentration to earlier goitre frequency in Sweden-an iodine sufficient country with long-term iodination of table salt.

Environ Health Prev Med · 2019 · PMC6898976 · PMID 31810448

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a decreasing trendno p-value reported

A decreasing trend in iodine concentration in Swedish milk has been reported, which is in line with data from Swedish Market Basket studies, indicating a decrease in the average iodine supply from food and beverage [ 31 ].

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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.