Analysis of monitoring results of Chinese iodized salt surveillance in 2010 / 中国地方病学杂志

Objective To understand the situation of iodized salt consumption at the household level and non-iodized salt distribution in those areas with low iodized salt coverage.Methods In 2010,iodized salt was monitored in 31 provinces and Xinjiang Production and Construction Corps in accordance with the Monitoring Program of the National Iodine Deficiency Disorders (Trial) (hereinafter referred to as the Program) requirements.Under the jurisdiction of counties (cities,districts,banners) with more than 9 townships (towns,street offices),based on the location of east,west,south,north and center,9 townships (town,district offices) were selected using simple random sampling method; 4 administrative villages (neighborhoods) were selected in each township (town,district office); and 8 residents in each administrative village (neighborhood) were selected.Under the jurisdiction of counties (cities,districts,banners) with less than 9 townships (towns,street offices),based on the location of east,west,south,north and center,1 township(town,district office) was selected using simple random sampling method; 4 administrative villages(neighborhoods) were selected in each township(town,district office);and 15 residents in each administrative village(neighborhood) were selected.Iodized salt coverage rate,qualification rate of iodized salt and consumption rate of qualified iodized salt were calculated in various provinces.The salt samples were tested by semi-quantitative method on the spot and then tested with quantitative method in laboratories.The standard of qualified iodized salt was set as 20-50 mg/kg and that of non-iodized salt was set as ＜ 5 mg/kg (GB/T 13025.7-1999).Results In 2010,a total of 2862 counties(districts,cities and banners) and 14 divisions of Xinjiang Production and Construction Corps,reported the monitoring results,and the monitoring coverage rate was 99.79％(2876/2882).A total of 826 696 copies of edible salt samples were tested,the coverage rate of iodized salt was 98.63％,the consumption rate of qualified iodized salt was 97.95％,and the coverage rate of qualified iodized salt was 96.63％.At province level,only in Tibet iodized salt coverage rate was ＜ 90％.At county level,2755 counties qualified iodized salt coverage rate was ≥90％,and 33 counties iodized salt coverage rate was ＜ 80％.The counties with qualified iodized salt coverage rate of 90％ or more accounted for 96.63％(2785/2882) of the total counties.Conclusions The counties where non-iodized salt coverage is higher than 20％ mainly distributed in the western or coastal areas and adjacent areas with higher iodine.These areas need policy and funding support from governments at all levels to reducc the gap between these areas and other areas.

Surveillance on iodized salt in China, in 2006 / 中华流行病学杂志

<p><b>OBJECTIVE</b>To understand the national situation of quality and consumption of iodized salt at production and household levels.</p><p><b>METHODS</b>Detailed surveillance method could be found in 'national iodized salt surveillance scheme', issued by MOH in 2004. The iodine concentrations in salt (except some special kinds of salt) were detected by direct titration with national standard of GB/T 13025.7-1999, in which the iodine content in qualified iodized salt was set as between 20 and 50 mg/kg and that in non-iodized salt was set as below 5 mg/kg.</p><p><b>RESULTS</b>At production level, the national lot qualified rate was 98.36% and all the provincial lot qualified rate of production level was over 90%. At household level, the national iodized salt coverage rate of household was 96.87% and the national qualified iodized salt coverage rate was 93.75%. 4 provinces (Tibet, Hainan, Xinjiang and Guangdong) had an iodized salt coverage rate lower than 90%. Further, the qualified iodized salt coverage rate of 5 provinces (Tibet, Hainan, Xinjiang, Guangdong and Qinghai) was below 90%. In 2006,80 counties did not conduct the iodized salt surveillance and non-iodized salt coverage rate of 185 counties was higher than 10%. In the respect of the qualified iodized salt coverage rate at household level, there were about 10 percent lagging behind the national goal that 95% of all the counties in China should achieve virtual elimination of iodine deficiency disorder before 2010.</p><p><b>CONCLUSION</b>At national level,the lot qualified rate at production level and the iodized salt coverage rate at household level maintained comparatively well. However, at county level, there were 75 counties whose iodized salt coverage rate was below 70%.</p>

Study on the national program of monltoring the iodized-salt situation in 2004 / 中华流行病学杂志

<p><b>OBJECTIVE</b>To understand the situation of quality and consumption of iodized-salt at production and household levels through monitoring on salt.</p><p><b>METHODS</b>9 townships were chosen in each county at different locations. In each township, two villages were selected in the center of the township and another two villages in remote settings. In each village, 8 households were selected for salt collection. The iodine concentrations in salt (except some special kinds of salt) were detected by method of direct titration with criteria in GB/T 13025.7-1999, in which the iodine content in qualified iodized-salt was set as 20 to 50 mg/kg and that in non-iodized-salt it was below 5 mg/kg.</p><p><b>RESULTS</b>Except for Tibet and Xinjiang, lot qualified rate of production level was 97.39% at the national level. Except for Xinjiang, the qualified rate of iodized-salt of household level was 96.45%; qualified iodized-salt coverage rate was 93.47%; noniodized-salt coverage rate was 3.09%. The results of the iodized-salt monitoring in 2004 maintained almost the same level as that in 2002. At production level,lot qualified rate of iodized-salt in Sichuan and Qinghai provinces were below 90%. At household level the qualified rate of iodized-salt in Sichuan and Hainan were below 90%. The coverage rates of qualified iodized-salt were below 90% for the total 7 provinces. In 5 provinces, the non-iodized-salt coverage rates were above 10%.</p><p><b>CONCLUSIONS</b>At national level the qualification of iodized-salt at production level was satisfactory. The coverage rates of qualified iodized-salt were below 90% not only in western but in some eastern provinces(including Beijing), which indicated that importance should be attached to the western areas and some newly discovered areas with problems as well. Through continual improvement of qualified iodized-salt coverage, sustained IDD elimination will be achieved.</p>