Table 1. Epidemiological Criteria for Assessment of Iodine Nutrition in a Population Based on Median Urinary Iodine Concentration.

Median UIC, µg/L	Iodine intake	Iodine nutrition
<20	Insufficient	Severe iodine deficiency
20–49	Insufficient	Moderate iodine deficiency
50–99	Insufficient	Mild iodine deficiency
100–199	Adequate	Optimal
200–299	More than adequate	Risk of iodine-induced hyperthyroidism in susceptible groups
≥300	Excessive	Risk of adverse health consequences

UIC, urinary iodine concentration.