Investigation and analysis on current situation of iodine deficiency disease in Chongqing

OBJECTIVE To analyze current situation and related factors of iodine deficiency disease(IDD)in Chongqing,and to provide scientific basis for IDD control and prevention.METHODS 9 towns were randomly selected in each county to detect residents' diet idolized salt.5 schools were selected from the east,west,south,north and middle areas of Chongqing,and 20 children aged from 8 to 10 were selected from each school to inspect urinary iodine.60 children aged 8-10 year from one of the selected schools were inspected with thyroid of.χ2 test and t-test were used for statistical analysis.RESULTS Diet idolized salt investigation was conducted in 14 217 families in 40 counties.The average coverage of iodized salt was 98.90%,which ranged from 95.28% to 100%.The average qualified iodized salt rate was 95.59%,which ranged from 90% to 99.72%.The urinary iodine investigation was conducted in 4 050 people,and the urinary iodine median was 247.20 μg/L,37.10% of which were more than 300 μg/L.25%(10/40).Medians urinary iodine in the counties was 100-200 μg/L.57.5%(23/40)of counties' urinary iodine medians were 200-300 μg/L,and 17.5%(7/40)were higher than 300 μg/L.The goiter investigation was conducted in 2,393 individuals.The goiter rate was 7.02% by palpation and 6.64% by B ultrasound,both of which ranged from 5.00% to 8.33%.The goiter rate of children aged 8 years old,9 years old and 10 years old were 6.68%(53/793),6.54%(53/811),7.86%(62/789)and 6.81%(54/793),7.64%(62/811),5.45%(43/789)by B ultrasound separately.CONCLUSION It can be concluded that the countermeasure of resident's diet idolized salt is strengthened and the work of IDD control and prevention is effective.Population iodine is sufficient and child goiter rate has been controlled to a low level.But iodine is excessive in Chongqing,and salt iodine should be reduced.