A survey of iodine nutritional status of the crowd in iodine-deficient areas that did not participate in the provincial surveillance program on iodine deficiency disorders in Jiangsu Province / 中华地方病学杂志

ABSTRACT

Objective To investigate the iodine nutritional status of the crowd that did not participate in the iodine deficiency disorders (IDD) survey in iodine deficiency areas in Jiangsu Province so as to provide a basis for prevention and control of IDD.Methods Eight to ten years old children were chosen from the counties(cities,districts) of Jiangsu Province that did not participate in the IDD survey and urine samples of students and salt samples of their families were researched.In each county (city,district) one township (street) was selected according to 5 directions of east,south,west,north,center; in each township one primary school was selected and in each primary school 20 children aged 8-10 were chosen half of the male and female,to collect their urine samples and salt samples at their families.Urinary iodine was measured using arsenic cerium catalytic spectrophotometric method (WS/T 107-2006),and salt iodine was measured using direct titration of universal test method in salt industry (GB/T 13025.7-1999).Iodine nutrition criterion of international health organization recommended staindardchildren urinary iodine ＜ 100 μg/L as iodine deficiency,100-199 μg/L as iodine appropriate,200-299 μg/L as iodine more than appropriate,≥ 300 μg/L as iodine excess.Results A total of 7 523 urinary samples of 8-10 years old children were collected from 76 iodine deficiency counties (cities,districts),and the median of urinary iodine was 235.0 μg/L.In all investigated counties (cities,districts),the medians of urinary iodine of 22 counties(cities,districts) were 100-199 μg/L,42 counties(cities,districts) were 200-299 μg/L,and 12 counties (cities,districts) were ≥300 μg/L.A total of 7 523 salt samples were collected,and the median of salt iodine was 29.68 mg/kg; Taizhou City had the highest salt iodine median,which was 31.43 mg/kg; and Lianyungang City,the lowest,25.11 mg/kg.The coverage rate of iodized salt was 98.6％(7 417/7 523); iodized salt qualification rate was 98.6％ (7 312/7 417); and consuming rate of qualified iodized salt was 97.2％(7 312/7 523) in 76 iodine deficiency counties (cities,districts).Conclusions The progress in prevention and control of IDD in iodine-deficient areas that did not participate in IDD survey in the past is good in Jiangsu Province; the overall level of iodine nutrition of whole population is adequate.But the median of urinary iodine in some counties (cities,districts) is at a higher level.