Monitoring and analysis on iodine deficiency disorders in the high risk areas of Wenzhou City in 2014

Objective To understand the dynamic conditions after reaching the stage goal of elimination of iodine deficiency disorders (IDD) in Wenzhou, and to provide a scientific basis for prevention and treatment of IDD. Methods Three counties that the annual consumption rate of qualified iodized salt < 80% in 2014 and had the prevalence of endemic cretinism in history, Cangnan, Taishun and Yongjia, were selected as high risk monitoring areas. Three townships were selected in each area, and two primary schools were selected from each township, and 40 children urine samples were collected in each school (half male and half female) and the age of children were 8 -10 years old. And near the location of these primary schools, we randomly selected 10 pregnant women in each village, and estimated the urinary iodine level and salt iodine concentration, respectively. The examination of thyroid by B ultrasound was performed in children by provincial professionals. Urinary iodine was determined using the arsenic cerium catalytic spectrophotometric method (GB/T 13025.7-2012). Salt iodine was determined by direct titration. Results Endemic cretinism case was not found in this survey, total goiter rate of 8 -10 years old children was 2.04% (16/783). The median of urinary iodine was 116.1 and 108.2 μg/L, respectively, in 8 -10 years old children and pregnant women. Iodized salt coverage rate was 90.48% (171/189), the intaking rate of qualified iodized salt was 84.66%(160/189). The concentration of pregnant women urinary iodine and salt iodine was positively correlated(r = 0.54,P < 0.05). Conclusions Children's iodine nutrition is in the appropriate level, but pregnant women are in iodine definciency in Wenzhou City. Key words: Iodine deficiency disorders; Goiter rate; Iodine; Salts; Urine iodine