The mean age of the 757 children was 9.69 3.64 years (4e16
years) (boys 48.1% and girls 51.9%). The overall urinary iodine
concentration was 119 70 mg/L (median ¼ 120 mg/L). Milk was
consumed at least three times a day by 20.5% of the children, twice
a day by 48.5%, once a day by 20.0%, once a week by 6.6% and never
by 4.4%. The likelihood of having an urinary iodine concentration
100 mg/Lwas significantly inversely associated with the frequency
of milk intake. This association remained significant after adjusting
the logistic regression model for other variables that could have
influenced the urinary iodine concentrations, such as geographic
origin, sex, intake of iodized salt, or source of drinking water
(Fig. 2).