Iodine Content Of Salt Research Articles

Adjusting the Iodine Content of Iodized Salt to Meet the Recommended Intake for Females of Reproductive Age: A Simulation Study with a Reduced Sodium Scenario

Adjusting the Iodine Content of Iodized Salt to Meet the Recommended Intake for Females of Reproductive Age: A Simulation Study with a Reduced Sodium Scenario

Investigation of the effects of heat and light on iodine content of packaged and open salt brands collected from Jimma town

Investigation of the effects of heat and light on iodine content of packaged and open salt brands collected from Jimma town

Prevalence of goitre and iodine deficiency among school children (6-12 years) in rural areas of North Karnataka, India: A cross-sectional survey, 2016-19.

Iodine deficiency disorders (IDD) have remained an unresolved public health problem in India. In this survey, we have estimated the prevalence of IDD among 6-12 years of school children in rural areas of north Karnataka, India and estimated the prevalence of low iodine content (<15 ppm) in salt at the household level and urine iodine excretion in this population. In this cross-sectional survey, we recruited 16,827 children between 6 and 12 years of age through multistage sampling from six districts. Goitre was examined clinically for all children. Household-level salt iodine estimation and urinary iodine estimation were carried out among a subset of the participants. Overall prevalence of goitre was 17.1% (95% CI: 16.5, 17.7). Out of this, 76.7% (n = 2116) had Grade-1 goitre, and 23.7% (n = 656) had Grade-2 goitre. The prevalence of goitre was higher among females (17.9%, vs. male 16.4%, P < 0.05). The prevalence of low iodine content (<15 ppm) in salt was 48.5% (95%CI: 46.7, 50.3). The overall median iodine excretion in urine was 85 μg/L (IQR: 60-150 μg/L). In total, 37.2% (n = 601) had mild iodine deficiency, 5.2% (n = 84) had moderate deficiency, and 10.1% (n = 163) had severe deficiency. All parameters showed high inter- and intradistrict variations. North Karnataka has a high goitre prevalence. Low use of iodized salt can be a major reason for the high prevalence of the condition. Ensuring the availability of iodized salt in this region and periodic surveillance to measure the impact of the programme should be the priority in this region.

Nearly one-in-five households utilized inadequate iodized salt in Nifas Silk Sub-City, Addis Ababa, Ethiopia

BackgroundThere is no country in the developing world where iodine deficiency is not a public health problem including Ethiopia. Therefore, this study aimed to assess inadequate utilization of iodized salt and associated factors at household level in woreda 11 Nifas Silk Sub-city, Addis Ababa, Ethiopia.MethodsA community-based cross-sectional study was conducted with multistage sampling technique on 348 household respondents. The data were collected using interviewer-administered structured questionnaires and an iodine rapid test kit. The data were edited, cleaned, and entered using Epi-data version 4.6.2 and exported to SPSS version 25 for analysis. A multivariable logistic regression model was fitted to identify associated factors for inadequate utilization of iodized salt. The statistical significance was declared at a p-value of less than 0.05 with 95% confidence interval.ResultsA total of 348 household respondents were participated. The amount of iodine content in salt 0 ppm, < 15ppm and > 15ppm were 11.8%, 7.2% and 81.0% respectively. Total inadequate utilization of iodized salt was 19%. Using unpacked salt [AOR; 0.50 (95%CI: 0.27, 0.93)], using a container without a lid [AOR; 0.29 (95%CI: 013, 0.63)], and having insufficient knowledge [AOR; 2.10 (95%CI: 1.14, 3.86)] were all significantly connected with using inadequate iodized salt.ConclusionsIodized salt utilization was inadequate. Using containers without a lid, unpacked salt, and poor knowledge were associated factors. There should be a provision of adequate knowledge about iodized salt, a proper storage and handling.

Iodine Excess May Lead to Low Exam Score in Children Aged 8-10 Years.

Recent research has shown that iodine excess may damage children's intelligence. Years of monitoring results in Shanghai show the iodine status has approached the upper limit of the appropriate range for children aged 8-10years, indicating a risk of iodine excess. We used multi-stage random sampling to select children. Sixteen districts of Shanghai were divided into five units based on geographic location, and one primary school was randomly selected from each unit. In each selected school, about 40 children aged 8-10years were randomly recruited to measure their urinary iodine concentration (UIC), household salt iodine concentration (SIC), the score of the final unified exam of the last semester, and school canteen salt iodine concentration. The median UIC of 3213 children aged 8-10years in Shanghai was 195.4 (122.0, 285.8) µg/L and exceeded 200µg/L in 48.8% of the population. Household and school canteen iodized salt coverage rates were 60.3% and 82.5% respectively, and mean household and school canteen SICs were 21.51 ± 9.30mg/kg and 25.29 ± 3.40mg/kg respectively. By correcting for potential confounding factors, logistic regression demonstrated that compared to the adequate iodine status group, students in the slight iodine excess group were less likely to get "A" (score > 90) in math, Chinese, and English exams (Math: OR = 0.775, 95% CI = 0.660-0.911, P = 0.002; Chinese: OR = 0.707, 95% CI = 0.543-0.842, P < 0.001; English: OR = 0.720, 95% CI = 0.610-0.849, P < 0.001). In Shanghai, the iodine status of 8-10-year-old children is approaching the upper limit of the adequate range. Iodine excess in Shanghai may lead to low exam scores for students.

Factors associated with recent iodine intake level among household food handlers in Southwest Ethiopia: a cross-sectional study

BackgroundIodine deficiency is a global public health threat, affecting an estimated two billion people. The median urinary iodine concentration is more reliable in determining recent iodine intakes and the risks of iodine deficiency. Therefore, this study was aimed to identify the factors associated with recent iodine intake level using median urinary iodine concentration as an indicator among household food handlers in southwest Ethiopia.MethodsA community-based survey was conducted with selected households using a pretested interviewer-administered questionnaire in southwest Ethiopia. A 20-gram sample of table salt and a 5 ml causal urine samples were also collected and analyzed using rapid test kit and a Sandell-Kolthoff reaction, respectively. A salt iodine concentration above 15 ppm was classified as adequately iodized and a median urinary iodine concentration between 100 and 200µgl− 1 was considered as adequate iodine intake. A bivariable and multivariable logistic regression model was fitted. Crude and adjusted odds ratios with their 95% confidence levels were reported. Associations with a p-value ≤ 0.05 were used to declare statistical significance.ResultsA total of 478 women were included, with a mean age of 33.2 (± 8.4 years). Only 268 (56.1%) of the households had adequately iodized salt (> 15 ppm). The median urinary iodine concentration (interquartile range) was 87.5 µg l− 1 (45.6-107.6). In a fitted multivariable logistic regression model (p-value = 0.911), illiterate women (AOR = 4.61; 95% CI: 2.17, 9.81), poorly iodized salt in the household (AOR = 25.0; 95% CI: 13–48), salt purchased from open market (AOR = 1.93; 95% CI: 1.0, 3.73) and women who do not read the label during purchasing the salt (AOR = 3.07; 95% CI: 1.31, 7.17) were important predictors of the risk of Iodine deficiency.ConclusionDespite public health efforts to improve iodine intake, its deficiency is still a major public health problem among southwest Ethiopian women.

Iodine concentration in edible salt from production to retail level in Bangladeshi territory: A comparative study following standard regulations

Iodine concentration in edible salt from production to retail level in Bangladeshi territory: A comparative study following standard regulations

National and Sub-National Estimates of Household Coverage of Iodized Salt and Urinary Iodine Status among Women of Reproductive Age in India: Insights from the India Iodine Survey, 2018–19

BackgroundIodine deficiency is a significant public health problem for many populations worldwide, including India, particularly during the “first 1000 days” of life. Though Universal Salt iodization (USI) is mandatory in India, prior to 2018–19, there was no state-wide survey with estimates of iodine concentrations in salt using iodometric titration. Taking cognizance of this fact, Nutrition International commissioned the first-of-its-kind national-level survey in India, titled the India Iodine Survey 2018–19. ObjectivesThe study was conducted across the country to provide national and subnational estimates of iodine concentrations in household salt using iodometric titration and iodine nutrition status among women of reproductive age (15–49 y). MethodsThe survey adopted a multi-stage random cluster probability proportional to size sampling design, covering 21,406 households in all the states and union territories (UTs) of India. ResultsAt the national level, the household coverage of edible salt with adequate iodine (content ≥15 parts/million) was 76.3%. At the sub-national level, the coverage varied, with 10 states and 3 UTs achieving USI and 11 states and 2 UTs falling below the national average, with the highest among all the states and UTs, being Jammu and Kashmir and the lowest being Tamil Nadu. At the national level, the median urinary iodine concentration for pregnant women was 173.4 μg/L, for lactating women was 172.8 μg/L, and for non-pregnant, non-lactating women, it was 178.0 μg/L, which is within the adequate iodine nutrition range according to the WHO guidelines. ConclusionsThe survey results can be widely used by various stakeholders, including government, academia, and industry, to understand the iodine nutrition status of the population, enable the scale-up of sustained efforts toward consolidating gains and achieving USI, leading to the reduction and elimination of Iodine Deficiency Disorders.

Commercially available iodized salts in Noakhali, Bangladesh: Estimation of iodine content, stability, and consumer satisfaction level

Commercially available iodized salts in Noakhali, Bangladesh: Estimation of iodine content, stability, and consumer satisfaction level

Iodine intake assessment in the staff of a Porto region university (Portugal): the iMC Salt trial

PurposeIodine deficiency disorder (IDD) is an ongoing worldwide recognized problem with over two billion individuals having insufficient iodine intake. School-aged children and pregnant women are often target groups for epidemiological studies, but there is a lack of knowledge on the general adult population. The aim of this study was to assess the iodine status among a Portuguese public university staff as a proxy for the adult working population.MethodsThe population study covered 103 adults within the iMC Salt randomized clinical trial, aged 24–69 years. Urinary iodine concentration was measured spectrophotometrically using the Sandell–Kolthoff reaction. Iodine food intake was assessed using a 24-h dietary recall. The contribution of discretionary salt to the iodine daily intake was assessed through 24-h urinary sodium excretion (UIE) and potentiometric iodine determination of household salt.ResultsThe mean urine volume in 24 h was 1.5 L. The median daily iodine intake estimated from 24-h UIE was 113 µg/day, being lower among women (p < 0.05). Only 22% of participants showed iodine intake above the WHO-recommended cutoff (150 µg/day). The median daily iodine intake estimated from the 24-h dietary recall was 58 µg/day (51 and 68 µg/day in women and men, respectively). Dairy, including yoghurt and milk products, were the primary dietary iodine source (55%). Iodine intake estimated from 24-h UIE and 24-h dietary recall was moderately correlated (Spearman rank correlation coefficient r = 0.34, p < 0.05). The average iodine concentration in household salt was 14 mg I/kg, with 45% of the samples below the minimum threshold preconized by WHO (15 mg I/kg). The contribution of discretionary salt to the daily iodine intake was around 38%.ConclusionThis study contributes new knowledge about iodine status in Portuguese working adults. The results revealed moderate iodine deficiency, particularly in women. Public health strategies and monitoring programs are needed to ensure iodine adequacy in all population groups.

Определение содержания йода, йодидов и йодатов в пищевых продуктах

Currently iodine deficiency diseases are one of the most important medical and social problems. In this regard, the purpose of the study is to determine the content of iodine, iodides, iodates in iodized salt, drinking and mineral water, seaweed, to determine the stability of the iodine content in salt. For the qualitative determination of iodides and iodates ions in salts and molecular iodine in seaweed, an iodine starch reaction has been carried out. The presence of iodide ions in iodized water has been determined by reaction with silver nitrate and chlorine water, the iodine released has been extracted with chloroform. Quantitative determination of iodine in salt has been carried out by the titrimetric method, in water – by colorimetric method, in seaweed – by gravimetric method with subsequent titration. The study has found that iodized salt contains iodine in the form of potassium iodate, in an amount of 18.65 μg / g of elemental iodine, kelp contains molecular iodine in the amount of 8.12 μg / g of elemental iodine, and iodized water contains potassium iodide in the amount of 0.327 μg / ml of elemental iodine. The study has proved that over time, the amount of iodine in the salt iodized with potassium iodate decreases after a month by 5.6 times. In order to comply with the daily rate of iodine intake, it is necessary to include in your diet about 9.7 g of iodized salt, which exceeds the daily norm of its consumption in 5 g. In this regard, it is recommended to use iodized salt (not more than 5 g) or iodized water (0.7 L of water) or kelp (18.47 g) as a prevention of iodine deficiency.

Salt Production and Availability of Iodized Salt in the Municipality of Sèmè-Kpodji in 2022

Background: Cooking salt is widely used to provide iodine to humans. In Benin, the production of salt is still artisanal. Our study focused on salt produced in Sèmè-Kpodji, a secondary site of local salt production in Benin, and on the availability of iodine in salt in this municipality. Methods: The descriptive cross-sectional study included exhaustive salt producers and randomly selected households in Sèmè-Kpodji. Direct observation was made to describe salt production. In household, a standard questionnaire collected data about the physical characteristic of salt used. Iodine content was determined with the MBI kit and by the iodometric titration method. Results: A total of 8 producers and 365 participants in the households were surveyed. Salt is produced by drying sea water on tarps for three and a half days. The process is done in eight (8) steps, the last of which is the iodization of the product and the packaging. By iodometric titration, the salt produced had an iodine content of 5.2ppm. The mean content of iodine in salt in household was: 87.5 ± 66.0ppm (2.6-396.1). Only 31.2% of cooking salt samples were adequately iodized (15-40ppm). High iodine concentrations have been observed in 62.2% of salt samples. Conclusion: Salts consumed in households in Sèmè-Kpodji ’municipality were, for the most part, excessively iodized, whereas local production is artisanal and low in iodine. Iodization of the latter is mandatory before marketing. A monitoring of the salt iodization strategy should be maintained to avoid excessive iodine consumption which can cause hormonal disorders.

Iodine status, household salt iodine content, knowledge and practice assessment among pregnant women in Butajira, South Central Ethiopia.

Iodine is one of the crucial micronutrients needed by the human body, and is vitally important during pregnancy. This study aimed to determine the relationship between the iodine status of pregnant women and their knowledge, and practices regarding iodized salt. All participants were enrolled in the Butajira nutrition, mental health and pregnancy (BUNMAP) cohort, Butajira, Ethiopia in February-May, 2019. In this cross-sectional study, 152 pregnant women without hypertension or known thyroid disease before or during pregnancy were randomly selected from the BUNMAP mother to child cohort (n = 832). Spot urine samples were collected to estimate the level of urinary iodine concentration (UIC). Salt samples were also collected from their homes. The Sandall-Kolthoff (S-K) method was used to measure the level of iodine in the urine samples, and iodometric titration was used to measure the level of iodine in the salt. Data was entered and cleaned using Epi-info version 3.5.3 and then exported to SPSS version 20 for further analysis. Multivariate logistic regression analysis was performed to identify associations in the collected data. The WHO recommended level of iodine for populations of pregnant women is 150-249 F06Dg/L. The median UIC among pregnant women in this study was 151.2 μg/L [interquartile range (IQR) = 85.5-236.2 F06Dg/L], at the low end of this range. About half (49.65%) of the participants were likely to be iodine deficient. There was a significant association between having a formal job (AOR = 2.56; CI = 1.11-5.96) and iodine sufficiency. Based on a cutoff of >15 ppm (mg/kg), 91.7% (95% CI: 87.2-96.2) of the salts collected from the household had adequate iodine content. The median iodine level of the collected salt samples was 34.9 mg/kg (ppm) (IQR = 24.2-44.6 mg/kg). The UNICEF 2018 guidelines for adequate iodine nutrition in pregnant women include both a recommended median range of 150-249 μg/L, and an upper limit of 20% on the fraction of the population with UIC below 50 μg/L. Because our study population's median level is 151.2 μg/L and the percentage of pregnant women with urinary iodine concentration of less than 50 μg/L is 9.7% (14/145), the women received adequate iodine nutrition. The availability of adequately iodized salt in households is more than 90%, as recommended by WHO. In light of previous iodine deficiency in this region of Ethiopia, the salt iodization program promotes the health of babies and mothers.

How to Decide the Iodine Content in Salt for a Country—China as an Example

Globally, many countries have implemented universal salt iodization to prevent and control iodine deficiency disorders. Therefore, it is important to determine the optimal iodine content in salt and to adjust it in a timely manner. This article aims to establish a process for selecting, deciding, and evaluating the iodine content in salt for China and, if possible, providing references for other countries. Information on salt intake, water iodine, and iodine stability in salt was collected. A field investigation was carried out in different populations in four provinces. Iodine intake was calculated and the appropriate iodine content for salt preliminarily obtained, then verified for suitability with 2020 China National Iodine Deficiency Disorders Surveillance data. In total, 2837 children, 1660 adults, and 2145 pregnant women were enrolled, and their iodine intake from food was 3.7–96.1, 60.0–156.0 and 65.0–112.0 µg/d, respectively. After calculation, when the iodine content in salt was 20, 25 and 30 mg/kg, for children and adults, the total iodine intake ranged from 173.4 to 253.5 µg/d and 230.3 to 379.8 µg/d, respectively. When the iodine content in salt was 30 and 35 mg/kg, for pregnant women, the total iodine intake was 296.8–408.9 µg/d, which was between the recommended nutrient intake and tolerable upper intake level. Therefore, in China, the iodine content in salt in the general population can be preset as 20, 25 and 30 mg/kg, and that in pregnant women 30 and 35 mg/kg, with a variation of ±5 mg/kg based on the automatic spraying technique used in the salt processing plant. Iodine nutritional status was then evaluated according to the preset iodine content in the salt, and it reached the appropriate level for the different populations. The iodine content in salt in China was decided and verified, and the procedure of selecting the iodine content in salt was established for the reference of different countries.

Prevalence of Iodine Deficiency and Urinary Iodine Excretion among School-Going Children in a Southern District of Karnataka – A Cross-Sectional Study

Background: Iodine deficiency is a major public health problem, which leads to impaired neurodevelopment, particularly in early life and is the single most preventable cause of mental retardation and brain damage in children and fortunately, it is preventable. Aims: To estimate the prevalence of goitre among school children in Kodagu District and to estimate the urine iodine excretion and salt iodine content in a subsample. Patients and Methods: A cross-sectional study was conducted among school children of 6-12 years in the Kodagu district. Sampling was done by population proportionate to size cluster sampling method with 2700 study participants, 540 salt samples and 270 urine samples. Results: Out of 2700 study participants, the prevalence of goitre was 15.50%. Students of Madikeri Taluk, rural area students, 11-year-old students, Consumption of Goitrogens among students show significant association with goitre after multivariate logistic regression analysis. Urinary iodine excretion test shows 0.36%, 1.80% and 12.99% of the participants had severe, moderate and mild iodine deficiency, respectively. Conclusion: The prevalence of goitre was high indicating that it is an endemic area. Activities such as periodic surveys, provision of iodised salt and intensified monitoring and further evaluation of the IDD programme is obligatory to reduce the goitre rate.

Universal salt iodization potentially contributes to health equity: socio-economic status of children does not affect iodine status.

Many studies have shown that socio-economic status (SES) contributes to health inequalities, with nutrition as one of the major risk factors. Iodine intake entirely depends on external sources, and deficiencies are known to be more prevalent in lower social groups, especially in countries with limited access to iodized salt. This study aimed to determine the influence of SES on iodine status and iodine availability from household salt in North Macedonia. Using cluster sampling, 1,200 children were recruited, and 1,191 children participated (response rate: 99.2%). Iodine status was assessed through urinary iodine concentration (UIC), and iodine availability through iodine content in household salt requested from participants. SES was assessed using standardized Family Affluence Score (FAS). No statistically significant correlation was found between FAS and iodine in salt. Median regression revealed no significant associations of middle vs. low FAS (β=0.00; 95%-confidence interval (CI)=[-0.61, 0.62]; p=0.999) or high vs. low affluence (β=0.48; 95% CI=[-1.37, 0.41]; p=0.291) with iodine content in household salt. UIC levels were significantly lower in middle FAS children compared to low FAS children (β=-16.4; 95% CI=[-32.3,-0.5]; p=0.043). No statistically significant differences in UIC were found between children with high and low affluence (β=-12.5; 95% CI=[-35.5, 10.5]; p=0.287), possibly due to lowered statistical power for this comparison. Universal salt iodization (USI) proves to be a cost-effective measure for appropriate iodine intake in healthy children and adults, irrespective of their social status. It can thus be concluded that USI contributes to reducing health inequalities related to iodine status among population of different social strata.

Factors Associated with Goiter Incidence in Farmers in Kismantoro Sub-District, Wonogiri Regency

Background: Kismantoro Sub-district has been an endemic area of ​​severe goiter since 1982, with a total goiter rate of 35.5% until 2007, when was declared a mild endemic goiter area (TGR 10.79%). Monitoring in 2017 on salt circulating in Wonogiri exposed that there were still 26.01% of brands that did not meet the Indonesian national standard. Objective: This study aimed to analyze the factors associated with goiter incidence in Kismantoro Sub-district, Wonogiri Regency. Methods: This research applied analytic observational with a case-control design. The samples were 41 respondents in the case group and 41 respondents in the control group, taken by purposive sampling. The history of goiter was obtained from the medical records of Kismantoro Community Health Center. The data analysis method employed was logistic regression analysis. Results: The results showed a significant correlation between age (p 0.005, OR 5.88, 95%CI 1.53-22.62), gender (p 0.003, OR 0.15, 95%CI 0.04-0.58), and salt iodine content (p 0.007, OR 0.14, 95%CI 0.03-0.68) with the goiter incidence in farmers in Kismantoro. Moreover, the multiple logistic regression test results revealed that age was the most dominant variable influencing the goiter incidence (p 0.006, OR 8.103, 95%CI (1.799-36.499). Conclusion: There was a relationship between age and the goiter incidence, gender with the goiter incidence, and iodine content in household salt with the goiter incidence, the multiple logistic regression test results indicated that the age variable most influenced goiter incidence among farmers in Kismantoro Sub-District, Wonogiri Regency.

Determine the iodine content of salt at the household level and its predictors in Bahirdar Town, Northwest Ethiopia

Introductioniodine deficiency remains a foremost public health problem in developing countries. About 66 million populations were at risk from iodine deficiency, 28 million people suffer from goiter and more than 50,000 prenatal deaths are related to iodine deficiency each year in Ethiopia. Besides, studies from different parts of Ethiopia have shown that a low proportion of households use adequate iodine concentration and varied from one household to another. Despite increased coverage, the quality of available salt is poor. To ensure safe and effective levels of iodine consumption, monitoring the levels of iodine in salt and the iodine status of the population is critical. However, kinds of literature are scant in Ethiopia particularly; no study is conducted in the current study area. Thus, the study aimed to determine the iodine content of salt and associated factors at the household level in Bahir Dar Town, Northwest Ethiopia.Methodsa community based cross-sectional study design was carried out in Bahir Dar Town from September to October 2015. A multi-stage sampling technique was used to select 706 study participants. A pre-tested, structured questionnaire and laboratory were used to collect data. A laboratory test, gold standard iodometric titration method was used to measure individual availability of adequately iodized salt. Multivariable logistic regression analysis was fitted to identify factors associated with the content of iodine. Adjusted Odds Ratio (AOR) with corresponding 95% confidence interval was computed to show the strength of association. In multivariable analysis, a p-value of <0.05 was used to declare statistical significance.Resultsa total, of 690 participants were included in the study. About 70.1% (95%CI: 63.41, 76.76) of the households were used adequate iodized salt (≥15 ppm). The result of the multivariate analysis revealed that respondents with secondary school (AOR=3.05; 95%CI: 1.51,6.18), age 30-44 years (AOR=1.99; 95%CI: 1.08,3.69), good knowledge (AOR=3.34; 95% CI: 2.09,5.32) and being in the highest wealth status (AOR=4.35,95% CI: 2.43,7.8) had higher odds of availability of adequately iodized salt at the household compared to the counterpart. Besides, using covered salt (AOR=6.10, 95% CI: 3.78, 9.87) and storing salt in a dry place (AOR=4.17; 95% CI: 2.21, 7.86) were positively associated with the availability of adequately iodized salt.Conclusionthe availability of adequately iodized salt in the household is still low. Further institutionalizing iodized salt regulation and awareness creation will require to improve safe iodine consumption through the community.

Iodine in household cooking salt no longer plays a crucial role in iodine status of residents in Tianjin, China.

The contribution of household cooking salt to population iodine status is decreasing in China, the applicability of the coverage rate of iodized salt (IS), proportion of adequately iodized salt (AIS), and salt iodine concentration (SIC) of household cooking salt used for iodine status assessment of residents requires further investigation. Through the IDD control project, 16,445 children and 4848 pregnant women were recruited from Tianjin, China and the relationship between the coverage rate of IS, proportion of AIS, SIC, and population iodine status was analyzed. Additionally, through the thyroid health survey project, 856 children with IS or noniodized salt were recruited. The effects of different household cooking salts on individual iodine status and thyroid health were analyzed. After adjusting for confounding factors, no relationship was found between the coverage rate of IS, proportion of AIS, SIC of household cooking salt, and iodine status of children and pregnant women (all P > 0.05). No differences in levels of thyroid function and structural indicators were found in children with different household cooking salts (all P > 0.05). Additionally, no relationship was found between noniodized salt exposure and goiter, overt hyperthyroidism, overt hypothyroidism, thyroid nodules, antibody single positivity, or subclinical hypothyroidism (all P > 0.05). Iodine in household cooking salt no longer plays a crucial role in iodine status in Tianjin, China. Other indicators must be identified as beneficial supplements for precise iodine status evaluation not only in Tianjin but also in other large cities in China.

Seasonal effects on urinary iodine concentrations in women of reproductive age: An observational study in Tanzania and South Africa

Seasonal effects on urinary iodine concentrations in women of reproductive age: An observational study in Tanzania and South Africa