Monitoring results of iodine deficiency disorders in Shanxi Province in 2011

Objective To investigate iodine deficiency disorders and iodine nutritional status in Shanxi, and to evaluate the implementation and effectiveness of intervention measures. To provide a reference information for adjusting salt iodine concentration in Shanxi Province. Methods According to the random number table method, 30 county-level monitoring sites were selected in the province, a primary school was selected from each county （city, district） by simple random sampling method. In each primary school, 40 randomly selected students＇ thyroid volumes were measured and iodine content in edible salt from these students＇ households was determined. Twelve students were randomly selected from the above students, and their urinary iodine contentswere determined and their home residents daily salt intakes were calculated. In the village with the school, 1 drinking water sample was collected according to the east, west, south, north and center sub-areas of the households. In centralized water supply areas, 2 tap water samples were collected and water iodine was determined; near the school,3 townships were selected; in every township, 5 pregnant and 5 lactating women were selected,and their urine samples were collected and urinary iodine was detected. Urinary iodine level of the children aged 8 - 10 in the remaining 89 counties（cities, districts） wasmonitoredinafollowingway： 1 township（town, street agency） was selected, respectively, in the east, west, south, north and center sub-areas in each county（city, district）, 20 children aged 8 - 10 in each of the selected townships were selected to collect urine samples, and urinary iodine was determined. Results The goiter rate was 2.7% in Shanxi. In monitoring sites that goiter rate less than or equal to five percent accounted for more than 90%（28/31）; the medians of urinary iodine in different populations： children was 274.6 μg/L（n = 377）,pregnant women was 279.6 μg/L（n = 439） and lactating women was 259.3 μg/L（n = 445 ） ; at the municipal level, the urinary iodine median range of different populations： children was 243.3 - 337.6μg/L, pregnant women was 192.8 - 330.1 μg/L, lactating women was 217.3 - 296 μg/L; the median iodine of the 1 182 households salt samples was 30.5 mg/kg, the coverage rate of qualified iodized salt was 97.63% ,the edible rate of qualified iodized salt was 95.18%; water iodine in the 31 households drinking water was determined, the median of water iodine was 4.4 μg/L,the iodine was in the range of 2.0 - 78.2 μg/L; per capita daily salt intake was 8.1 g,the standard error was 3.0 g; in children aged 8 - 10 urinary iodine monitoring results showed that the median of urinary iodine was 236.9 μg/L （n = 8 870）. In addition to one city, children＇s median urinary iodine was higher than 200 μg/L. Conelusiolas Most of the monitoring regions are still a water-natural iodine deficiency environment. The goiter rate in Shanxi is controlled at the national level. On the whole, the iodine nutrition level of residents is more than appropriate, and iodine concentration in salt needs to be adjusted lower slightly. Key words: Iodine ;  Urinary ;  Salt ;  Nutrition