Within the United States, African Americans suffer the nation’s highest level of iodine deficiency. According to the government’s National Health and Nutrition Examination Survey (NHANES) data for 2005–2008, African Americans’ urinary iodine reading of 137 µg/L is lower than that of Mexican Americans at 174 µg/L and of non-Hispanic whites at 168 µg/L. No separate data are given for Native Americans or other ethnic groups.
