The mean age of the 1205 children studied (boys 51.5% and girls
48.5%) was 10.84  2.96 years. The overall urinary iodine concentration
was 119  77 mg/L (median ¼ 90 mg/L). Milk was consumed
at least three times a day by 38.0% of the children, twice a day by
41.5%, once a day by 14.0%, five-six times a week by 5.3%, and never
by 1.2% (Fig. 3A). The mean urinary iodine concentration of the
children who consumed milk at least three times a day was
significantly greater than in the other groups (P < 0.001) (Fig. 3A).