Study on changing of iodine nutrition level of the people with unexcessive iodine drinking water in iodine excess areas after stopping supplies of iodized salt

Objective To discuss changing of iodine nutrition level of the people with unexcessive iodine drinking water in iodine excess areas after stopping supplies of iodized salt.Methods The families with 5 to 150 μg/L iodine contents in drinking water were chosen to substitute non-iodized salt for their current iodized salt for 2 months through field trial study,and urine samples of the target population were collected for determination of iodine change respectively before and the 60th day after the intervention.Results After the intervention,the median urinary iodine of school children aged 8 to 13 years was 252.2 μg/L,the median urinary iodine of women with productive age was 249.3 μg/L,the median urinary iodine of school children and women with productive age decreased significantly(P0.05).The median urinary iodine of school children in groups with different iodine contents in drinking water was between 189.7 μg/L and 308.2 μg/L,and the median urinary iodine of women with productive age was between 181.1 μg/L and 301.7μg/L.Conclusions The iodine nutrition level of people was adequate or more than adequate,drinking unexcessive iodine water in iodine excess areas after stopping supplies of iodized salt.