An analysis of monitoring results on iodized salt in Bazhong City, Sichuan Province from 2008 to 2018 / 中华地方病学杂志

ABSTRACT

Objective:To investigate the situation of iodized salt consumption of the households in Bazhong City from 2008 to 2018, and to discuss the change trend of the consumption rate of qualified iodized salt, so as to provide a scientific basis for prevention and control of iodine deficiency disorders in the next stage.Methods:Monitoring of iodized salt for households was carried out in 4 counties (districts) of Bazhong City from 2008 to 2012, and in 5 counties (districts) of Bazhong City from 2013 to 2018. According to the requirements of different monitoring programs in each year, 288 salt samples were collected from each county (district) from 2008 to 2011, and 300 salt samples were collected from each county (district) from 2012 to 2018, salt iodine was determined. Determination methods of salt iodine the arbitration method was adopted from 2008 to 2013, and the redox titration method was adopted from 2014 to 2018. Decision criteria 20 - 50 mg/kg was qualified iodized salt from 2008 to 2014; 21 - 39 mg/kg was qualified iodized salt from 2015 to 2018. Bazhong City achieved the goal of eliminating iodine deficiency disorders in 2010, lowered the iodization standard of salt in 2012, and the consumption rates of qualified iodized salt in each year were compared with those in 2010 and 2012.Results:In 2008 - 2011, 1 152 salt samples were collected; in 2012, 1 200 salt samples were collected; in 2013 - 2018, 1 500 salt samples were collected in Bazhong City. The coverage rate of iodized salt ranged from 98.09% to 100.00%, the qualified rate of iodized salt ranged from 91.69% to 98.35%, and the consumption rate of qualified iodized salt ranged from 91.27% to 98.26%. The consumption rates of qualified iodized salt in Bazhong City in 2008 - 2018 were compared, the difference was statistically significant (χ 2 = 133.953, P < 0.01). The consumption rates of qualified iodized salt in 2011 and 2014 - 2018 [95.40% (1 099/1 152), 95.00% (1 425/1 500), 92.93% (1 394/1 500), 93.67%(1 405/1 500), 91.27% (1 369/1 500), 92.73% (1 391/1 500)] were significantly lower than that in 2010 [98.26% (1 132/1 152)], the differences were statistically significant (χ 2 = 15.406, 20.097, 40.913, 33.196, 59.413, 43.067, P < 0.01). The consumption rates of qualified iodized salt in 2014 - 2018 were significantly lower than that in 2012 [97.50% (1 170/1 200)], the differences were statistically significant (χ 2 = 11.148, 29.066, 22.187, 46.194, 31.020, P < 0.01). Conclusions:From 2008 to 2018, the widespread situation of iodized salt in Bazhong City is generally good; the consumption rate of qualified iodized salt has reached the elimination standard of iodine deficiency disorders (> 90%). After the elimination target of iodine deficiency disorders has achieved in 2010 and the standard of qualified iodized salt has lowered in 2012, the consumption rate of qualified iodized salt in Bazhong City has decreased. It is suggested to continue to strengthen the supervision of salt market, health education and iodized salt monitoring, improve the quality of iodized salt production, maintain a high level of consumption rate of qualified iodized salt, and to ensure the continuous elimination of iodine deficiency disorders.