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Table 1 Epidemiological criteria for assessment of iodine nutrition in populations based on median urinary iodine concentration [23, 24].

From: Iodine intake as a risk factor for thyroid cancer: a comprehensive review of animal and human studies

Median urinary iodine concentration (UIC) Iodine intake Iodine nutrition
<20 μg/L Insufficient Severe iodine deficiency
20–49 μg/L Insufficient Moderate iodine deficiency
50–99 μg/L Insufficient Mild iodine deficiency
100–299 μg/L Adequate or more-than-adequate Sufficient
≥300 μg/L Excessive Risk of adverse health consequences (iodine-induced hyperthyroidism, autoimmune thyroid disease)