Objective To analyze the impact of a new salt iodine standard on children's iodine nutrition status.Methods A survey on iodine nutritional status was carried out in Rizhao before and after salt iodine content adjustment (2011,2012-2014).A town was selected from 5 areas (east,west,south,north,middle) in every county of Rizhao,4 villages were selected from each town,and then edible salt samples were collected in 15 households from each village.A central primary school was selected in some sampled town,at least 20 of these children's instant urine samples were collected for detection of urinary iodine,and at least 40 children aged 8-10 years old were selected for examination of thyroid volume.Results Totally 1 164 salt samples were collected before the adjustment,93.7％ (1 091/1 164) of salt iodine concentration was in 18-33 mg/kg;totally 400 urine samples of 8-10 children were collected and the median urinary iodine (MUI) was 250.7 μg/L;the thyroid glands of 200 children were inspected and the goiter rate with palpation was 3.0％ (6/200).Totally 3 600 salt samples were collected after the adjustment,88.5％ (3 186/3 600) of salt iodine concentration was in 18-33 mg/kg;totally 1 122 urine samples of 8-10 children were collected and the MUI was 140.4 μg/L;the thyroid glands of 1 336 children were inspected,the goiter rate with palpation was 1.0％ (13/1 336).Conclusions After implementation of the new standard,children's iodine nutrition has down to appropriate levels.So the salt iodine concentration after adjustment may be safer and the salt iodization prevention strategies should be carried out for a long time in Rizhao City.

Objective:To analyze the monitoring results of iodine deficiency disorders among residents in Rizhao City, Shandong Province, from 2016 to 2018.Methods:Information of monitoring data on iodine deficiency disorders of residents of Rizhao City, Shandong Province from 2016 to 2018 was collected from the Center for Disease Control and Prevention of Rizhao City, Shandong Province. The analysis carried out included iodine content of drinking water for residents of Rizhao City in 2017; iodine contents of salt in the home of 8 - 10 years of children, pregnant women; urine iodine levels of 8 - 10 years of children, pregnant women; and thyroid volume of 8 - 10 years of children from 2016 to 2018.Results:A total of 431 drinking water samples were collected in Rizhao City in 2017, the median of iodine in water was 4.8 &mu;g/L. In 2016 - 2018, the rate of non-iodized edible salt in the homes of children and pregnant women in Rizhao City were 11.09% (153/1 380), 19.07% (302/1 584) and 6.92% (90/1 301); the consumption rate of qualified iodized salt were 80.94% (1 117/1 380), 65.03% (1 030/1 584) and 84.63% (1 101/1 301), respectively. Of these, the highest rate of non-iodized edible salt was in 2017 (χ 2 = 75.38, P < 0.05), and with the lowest consumption rate of qualified iodized salt (χ 2 = 56.52, P < 0.05). Totally 829, 891 and 881 urine samples were tested for 8 - 10 years of children, and the medians of urine iodine were 195.8, 243.0 and 164.8 &mu;g/L, respectively. Totally 396, 381 and 420 urine samples were tested for pregnant women, and the medians of urine iodine were 161.5, 148.3 and 105.2 &mu;g/L, respectively. The rates of goiter in 8 - 10 years of children were 1.50% (13/866), 0.89% (8/901) and 1.25% (11/881), respectively, and the difference between years was not statistically significant (χ 2 = 1.41, P > 0.05). Conclusions:Rizhao City is an area of environmental iodine deficiency, local residents iodine nutrition in general is at an appropriate level. However, pregnant women show iodine deficiency in recent years, which will be the focus of scientific iodine supplementation measures.