Evaluation of elimination of iodine deficiency disorders in Chongqing municipal

Objective To evaluate the effectiveness of the iodine deficiency disorders(IDD) prevention program and analyze the influencing factors.Methods The level of iodine in resident salt obtained from 9 different towns was determined.The incidence of goiter and urinary iodine of children aged 8-10 year were examined in 5 schools.The knowledge of IDD in the Grade 5 students was evaluated.The data of leadership,monitoring,iodine-salt management and health education were checked.Results were analyzed using the chi-square test.Results 14,217 resident salt samples were examined.The coverage rate of qualified iodized salt was 95.9%(90.00%-99.72%).4,050 urine samples were analyzed.The median of urinary iodine was 247.20 μg/L,and 37.1% of the sample had a concentration over 300 μg/L.The proportion of 100-200 μg/L,200-300 μg/L and 300 μg/L at county level was 25%,57.5% and 17.5%,respectively.16,852 subjects were examined and the goiter rate was 5.8%(3.25%-9.00%).The score of student's knowledge of IDD was 4.4(3.1-5.0).The average score of control measure was 95(86-99).1 250 resident salt samples were re-examined by the county.The coverage rate of qualified iodized salt was 96.88%(90.91%-100%).16 852 subjects were examined and the goiter rate of palpation and B-ultrasonic examination was 7.02% and 6.64%,respectively.The score of student's knowledge of IDD was 2.5-4.9.The average score of control measure was 88.8-99.5.Conclusion Chongqing municipal has achieved the target of elimination of IDD at the province level.39 counties have achieved the target of elimination IDD and 1 county has achieved the target of basal level of elimination of IDD.The concentration of iodine in salt was high and the iodine concentration should be reduced.