Analysis of the monitoring results of edible iodized salt in Nanchang City from 2013 to 2018 / 中华地方病学杂志

ABSTRACT

Objective:To analyze the monitoring situation of iodized salt in Nanchang City after implementation of the new iodized salt standard, in order to provide a basis for formulating prevention and control strategy to iodine deficiency disorders.Methods:From 2013 to 2015, according to "Jiangxi Province Surveillance Pilot Scheme of Iodine Deficiency Disorders (2012)", 9 counties (districts) were selected for surveillance of iodized salt, every county (district) was divided into 5 sampling areas according to the east, west, south, north, and middle positions, and 1 township (street) was selected from each area, 4 administrative villages (neighborhood committees) were selected from each township (street), and 15 samples of household salt were sampled from each administrative village (neighborhood committee). From 2016 to 2018, according to "National Surveillance Pilot Scheme of Iodine Deficiency Disorders (2016)", some counties (districts) were divided into 5 sampling areas according to the east, west, south, north, and middle positions, and 1 township (street) was selected from each area, 1 elementary school was selected from each township (street), 40 non-boarding students aged 8 to 10 (aged balanced, half male and female) were selected from each elementary school, and salt samples from students' homes were collected and in each township (street) salt samples were collected from 20 pregnant women's homes. The remaining counties (districts) were sampled in accordance with "Jiangxi Province Surveillance Pilot Scheme of Iodine Deficiency Disorders (2012)". The iodine content of salt samples was detected, and the coverage rate, qualified rate and consumption rate of qualified iodized salt were calculated.Results:From 2013 to 2018, the coverage rate of iodized salt, the qualified rate of iodized salt and the consumption rate of qualified iodized salt were 99.52% (16 122/16 200), 95.83% (15 449/16 122) and 95.36% (15 449/16 200), respectively, and the median salt iodine was 23.50 mg/kg; the coverage rate of iodized salt in 2018 was the lowest [98.63% (2 663/2 700)], and the difference was statistically significant between different years (χ 2 = 97.856, P < 0.05); the qualified rate of iodized salt and the consumption rate of qualified iodized salt were both the lowest in 2016, which were 93.93% (2 509/2 671) and 92.93% (2 509/2 700) , respectively. There were significant differences in the qualified rate of iodized salt and the consumption rate of qualified iodized salt between different years (χ 2 = 65.090, 81.053, P < 0.05); the non-iodized salt rate in 2018 was the highest [1.37% (37/2 700)], and the difference was statistically significant between different years (χ 2 = 97.856, P < 0.05). From 2013 to 2018, the range of salt iodine content was 0.00 - 64.67 mg/kg. The coverage rate of iodized salt in Qingyunpu District and Nanchang County was both 100% (1 800/1 800), in Donghu District was the lowest [98.06% (1 765/1 800)]. There was significant difference in coverage rate of iodized salt among different counties (districts, χ 2 = 131.247, P < 0.05). The qualified rate of iodized salt in Qingyunpu District was the highest [99.11% (1 784/1 800) ], and in Xihu District was the lowest [93.16% (1 674/1 797)]. There was significant difference in qualified rate of iodized salt among different counties (districts, χ 2 = 127.257, P < 0.05). The consumption rate of qualified iodized salt in Qingyunpu District was the highest [99.11% (1 784/1 800) ], and in Xihu District was the lowest [93.00% (1 674/1 800)]. There were significant differences in the consumption rate of qualified iodized salt among different counties (districts, χ 2 = 123.784, P < 0.05). Conclusion:The coverage rate of iodized salt and the consumption rate of qualified iodized salt in Nanchang City from 2013 to 2018 are generally stable, meeting the requirements of iodized salt index in iodine deficiency disorders elimination standard.