Objective To understand the iodine nutrition status of key populations in Hedong District

Tianjin

and formulate relevant policies according to local conditions to ensure the elimination of iodine deficiency disease in the district. Methods Using a random sampling method

271 non-boarding students aged 8-10 years（balanced distribution of sex and age） and 100 pregnant women（balanced distribution of early

middle and late pregnancies） in Hedong District were selected as study subjects. The urinary iodine levels of the students and pregnant women and the salt iodine levels of salt samples consumed at home were measured

while the thyroid volume of the students was measured by ultrasound method and the rate of goiter was calculated. Results The overall median urinary iodine level of the students was 169.6 μg/L

with median urinary iodine levels of 158.9

156.9

and 198.9 μg/L in 8-

9-

and 10-year-old students

respectively. 1.8% of the students had goiter. The iodized salt coverage rate among students was 58.3%

the iodized salt qualification rate was 83.5%

the consumption rate of qualified iodized salt was 48.7%

and the median salt iodization level was 22.8 mg/kg. 37.2% of students consuming noniodized salt had urinary iodine <100 μg/L; 30.8% of students consuming unqualified iodized salt had urinary iodine <100 μg/L; among students consuming qualified iodized salt

the number of students with urinary iodine <100 μg/L was 25.0%.The overall median urinary iodine level of pregnant women was 155.4 μg/L

with 137.8

156.8 and 189.4 μg/L in early

mid and late pregnancy

respectively. 79.0% of pregnant women had iodized salt coverage

the iodized salt qualification rate was 91.1%

72.0% had consumed qualified iodized salt

and the median salt iodine level was 26.2 mg/kg. Among pregnant women who consumed non-iodized salt

the number of pregnant women with urinary iodine <150 μg/L accounted for 52.4%; among pregnant women who consumed unqualified iodized salt

the number of pregnant women with urinary iodine <150 μg/L accounted for 85.7%; among pregnant women who consumed qualified iodized salt

the number of pregnant women with urinary iodine <150 μg/L accounted for 43.1%. Conclusion Except for pregnant women in early pregnancy

the urinary iodine levels of the key populations in Hedong District are at an appropriate level. The relevant departments should continue to strengthen the rational iodine supplementation for the population

increase the consumption rate of qualified iodized salt for the population

and pay attention to the iodine nutrition level of special populations in order to achieve the goal of further controlling and eliminating iodine deficiency disease in Hedong District in the future.