Iodine check results in edible salt in Suzhou in 2017-2021 / 公共卫生与预防医学

ABSTRACT

Objective To understand the quality status of salt iodine monitoring results at the county level and checking results at the city level from 2017 to 2021 in Suzhou，and to provide a scientific basis for the development of iodine deficiency disease（IDD）prevention and control strategies and measures.  Methods During the past five years, Suzhou CDC randomly selected 15 samples of 300 monitored salt samples from each county/district CDC each year for spot checks. The data were processed by comparative analysis of relative error and grouped data t test.  Results In the conformity of iodized salt and non-iodized salt, the sample monitoring results of some counties/districts were non-iodized salt, while the city-level test results were iodized salt. In the conformity of iodized salt and seaweed iodized salt (or enhanced salt), the sample monitoring results of county/district level were iodized salt, while the test results at the city level were seaweed iodized salt (or enhanced salt). The non-conformity was relatively concentrated in some county/district laboratories, and the total amount of non-conformity tended to increase year by year. The total number of samples with relative error of >20% between the county/district and city-level results was the least in 2021, with 6, and the most in 2018, with 25. The number of samples with relative error of >30% between the county/district and city-level results was the least in 2017 being 0, while there were 12 samples in 2018, fluctuating within a small range in the past three years. The t-test results of grouped data showed that the average value of the checking results at the city level was generally higher than the monitoring results at the county level. There were 21 pairs of data with no statistical significance (P>0.05) and 29 pairs of data with statistical significance (P<0.05) between the results at the county/district level and at the city level. Among them, there were 7 counties/districts whose sample monitoring results were not significantly different from the city-level test results in 2020, while there were 9 counties/districts whose monitoring results were statistically different from the city-level test results in 2021.  Conclusion  The data analysis results show that the monitoring data of iodized salt in Suzhou is basically reliable and accurate, but there still exist some problems. Therefore, in the future work it is necessary to strengthen the monitoring system of IDD, increase training efforts, continuously monitor and check the quality of iodized salt to provide a scientific basis for effective prevention and control of IDD.