Analysis on iodine nutritional surveillance results of children aged 8～10 years in Sichuan Province 2022
Objective To provide evidences for adjusting iodine nutrition strategies by understanding and evaluating the current status of thyroid and iodine nutrition on the 8-10 years old children in Sichuan province.Methods One counties(county-level cities or districts)was selected in each of cities(prefectures)of Sichuan province in 2022.With simple random sampling,one town(sub-district)was selected respectively from each of the five divided directions in the east,west,south,north,and middle of each county,one primary school was selected respectively from each town(subdistrict),respectively.40 children aged 8-10 years were randomly selected from each primary school for checking and measuring the thyroid volume and nodule by using ultrasonic method,in addition the iodine content testing of their one urine sample and one edible salt sample at their home.SPSS 19.0 was used for descriptive analysis,and the comparison of rates was conducted by using Chi-square test,Kruskal Wallis H test was used to compare the median urine iodine,Spearman rank correlation analysis was used to examine the correlation between the median urine iodine and the mean salt iodine,α=0.05(bilateral).Results A total of 4 211 children aged 8-10 years were surveyed,the rate of goiter was 1.9％and the detection rate of thyroid nodule was 0.6％,the median of urinary iodine was 192.6 μg/L and the urine samples proportion of urinary iodine below 50 μg/L was 2.8％.The iodized salt coverage rate,the qualified rate of iodized salt and the consumption rate of qualified iodized salt were 99.1％,97.1％and 96.2％,respectively.The iodine mean of iodized salt and coefficient of variation of iodine in iodized salt were 27.1 mg/kg and 13.7％,respectively.There was a weak correlation between the median urine iodine of 8-10 years old children and the iodine mean of their household edible salt(rs=0.170,P=0.463).Conclusions The current status of iodine nutrition in children aged 8-10 years is generally suitable in Sichuan province,all related indicators such as the rate of goiter achieved the criteria for elimination of iodine deficiency disorders,but still it is necessary to strengthen the investigation and evaluation on the influence factors of the iodine nutritional status in the background of universal salt iodization.
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