Prevalence Of Iodine Deficiency Research Articles

Assessment of Iodine Status in Adults: A Case Study of Amasya

ABSTRACT Introduction: The prevalence of iodine deficiency in Turkey significantly decreased after iodine fortification of table salt, but regional differences may still exist. The objective of this cross-sectional study was to assess the iodine levels among adults residing in Amasya. Methodology: This study, which included 232 adults aged 18-64 years, was conducted in a public hospital in Amasya. The study data were obtained through a questionnaire form applied to individuals through face-to-face interviews. After taking general information and anthropometric measurements of the individuals participating in the study, urinary iodine levels were analyzed. Results: The mean urinary iodine level was 13.7±1.5 mcg/dL. Iodine status of 99.6% of the participants is normal and 64.9% of them use iodized salt. Alcohol consumption and body mass index showed a statistically significant difference according to urinary iodine level classification (median value). In individuals who consume iodized salt, the frequency of those with urinary iodine levels above the median value is higher compared to those who do not consume iodized salt. Conclusions: This study shows the iodine status of adult individuals living in Amasya. In future studies, dietary iodine intake of individuals should also be evaluated, and iodine status should be examined in vulnerable groups such as pregnant, lactating and elderly.

Iodine status in children with intestinal failure.

Children on long-term parenteral nutrition (PN) are at high risk of iodine deficiency (ID). However, most available information comes from cross-sectional studies. We investigated the iodine status, associated factors, and prevalence of hypothyroidism in children with intestinal failure (IF) who were followed up longitudinally. This was a cohort study of children with IF monitored for urine iodine concentration (UIC), iodine intake, serum selenium concentration, and thyroid function in an intestinal rehabilitation program. The outcome variable ID was defined as a UIC value < 100 μg/L. Adjusted generalized estimating equations were used to assess the effects of the exposure variables on the UIC. Twenty-four patients aged 62.7 (39.1; 79.7) months who received PN for 46.5 (21.5) months were included. The average energy supply was 81.2 kcal/kg/day, 77.6% of which was provided by PN. An average of 5.2 UIC measurements per patient were performed. ID prevalence decreased from baseline (83.3%) to the last assessment (45.8%). Three patients had hypothyroidism secondary to iodine and selenium combined severe deficiency. Iodine intake from enteral or oral nutritional formulas was positively associated with UIC (β = 0.71 [0.35, 1.07]; p < 0.001). Meeting approximately 80% of the estimated average requirement for iodine from nutritional formulas resulted in a greater probability of normal UIC values. ID is highly prevalent in children with IF who receive long-term PN and its frequency decreases with iodine intake from nutritional formulas. Severe combined iodine and selenium deficiencies are associated with the development of hypothyroidism in these patients.

Iodineminho Study: Iodine Supplementation and Prevalence of Iodine Deficiency In Pregnant Women.

Iodine is necessary for proper brain development. The prevalence of iodine deficiency in Portuguese pregnant women led the health authorities, in 2013, to recommend iodine supplementation for women in preconception, throughout pregnancy, and during lactation. This work aimed to assess the effect of iodine supplementation initiated in the preconception or the first trimester of pregnancy on the prevalence of iodine deficiency and maternal thyroid status. An observational prospective cohort study was conducted that followed the thyroid function and iodine status of women recruited during preconception or in the first trimester of pregnancy. Median urinary iodine concentration (UIC) was significantly higher among women taking iodine supplements (no-supplement group UIC = 63 µg/L; supplement group UIC = 100 µg/L; P = .002) but still below the levels recommended by the World Health Organization. Only 15% of pregnant women had adequate iodine status and 17% showed a UIC of less than 50 µg/L. There was no influence whether iodine supplementation was started during preconception or during the first trimester of gestation (UIC preconception group: 112 µg/L vs UIC pregnancy group: 91 µg/L; P = .569). In the first trimester of pregnancy, total thyroxine levels were lower and free triiodothyronine levels were higher in nonsupplemented women. Thyroglobulin levels were lower in women who started iodine supplementation during preconception compared to nonsupplemented women and women who started iodine supplementation during gestation. In the Minho region of Portugal, fertile women have insufficient iodine intake. Additional public health measures are needed since the current recommendations for iodine supplementation for pregnancy are unsatisfactory to achieve adequate iodine status.

Burden and trends of iodine deficiency in Asia from 1990 to 2019

ObjectivesUnderstanding iodine deficiency (ID) burdens and trends in Asia can help guide effective intervention strategies. This study aims to report the incidence, prevalence, and disability-adjusted life years (DALYs) of ID in 48 Asian countries during the period 1990–2019. Study designData on ID were retrieved from the Global Burden of Diseases, Injuries, and Risk Factors Study (GBD) 2019 and estimated by age, sex, geographical region, and sociodemographic index (SDI). MethodsThe estimated annual percentage change (EAPC) was calculated to evaluate the changing trend of age-standardized incidence rate (ASIR), age-standardized prevalence rate (ASPR), and age-standardized DALYs rate (ASDR) related to ID during the period 1990–2019. ResultsIn Asia, there were 126,983,965.8 cases with 5,466,213.1 new incidence and 1,765,995.5 DALYs of ID in 2019. Between 1999 and 2019, the EAPC in ASIR, ASPR and ASDR were −0.6 (95% confidence interval [CI], −0.8 to −0.4), −0.9 (95% CI, −1.2 to −0.7), and −1.6 (95% CI, −1.8 to −1.5), respectively. Malaysia charted the largest decrease in ASIR, ASPR, and ASDR (82.4%, 85.3%, and 80.9% separately), whereas the Philippines and Pakistan were the only two countries that witnessed an increase in ASIR and ASPR. ID burdens were more pronounced in women, countries located to the south of the Himalayas, and low-middle SDI regions. ConclusionsThe incidence, prevalence, and DALYs of ID in Asia substantially decreased from 1990 to 2019. Women and low-middle SDI countries have relatively high ID burdens. Governments need to pay constant attention to the implementation and monitoring of universal salt iodization.

Prevalence of iodine deficiency among vegan compared to vegetarian and omnivore children in the Czech Republic: cross-sectional study

BackgroundThe intake and homeostasis of iodine, an essential micronutrient that plays a vital role in thyroid physiology, is of particular concern with the increasing popularity of vegetarian (VG) and vegan (VN) diets. Children on these restrictive diets may be at risk of possible adverse effects on growth and development, but there is currently a lack of recent epidemiological studies on this topic.MethodsWe gathered clinical, anthropometric, and blood/urine data on iodine status and thyroid function from children aged 0–18 years who followed either a VG diet (n = 91), VN diet (n = 75), or omnivore diet (OM, n = 52). Cross-sectional comparison of the groups and linear regression was used. Stratified analyses were performed based on age (according to WHO): 0–5 years and 6–18 years.ResultsOur study revealed no significant differences in levels of thyroid-stimulating hormone (TSH), triiodothyronine (fT3), thyroglobulin (TG) or anti-thyroid peroxidase antibody (ATPOc) between the VG, VN, and OM groups. However, thyroxine (fT4) levels were found to be higher in the VN group compared to the OM group (15.00 ± 1.73 vs. 16.17 ± 1.82 pmol/l, p < 0.001). The presence of anti-thyroglobulin antibodies (AhTGc) was notably more common in the VG (18.2%)/VN (35.0%) groups than in the OM group (2.1%) (p < 0.001). Regarding iodine status, the concentration of iodine in spot urine (UIC) was found to be highest in the OM group (197.28 ± 105.35 vs. VG: 177.95 ± 155.88 vs. VN: 162.97 ± 164.51 µg/l, p < 0.001). Notably, the lowest (5.99 µg/l) and highest (991.80 µg/l) levels were measured in the VN group. Of the participants, 31 VN, 31 VG and 10 OM children met the criteria for iodine deficiency (i.e., UIC < 100 µg/l). We found that children with regular iodine supplementation had higher UIC (p < 0.001). Importantly, the median UIC was above 100 µg/l in all three groups, through the recommended intake (RDI) of iodine was rarely met throughout the groups.ConclusionWe have observed a trend to lower UIC values in VN as compared to OM. This trend is also reflected in the median UIC values, even though the median UIC values were above the WHO cut-off (e.g., 100 µg/l) for iodine deficiency in all dietary groups. These results suggest that VN and VG children may be more at higher risk of iodine deficiency, this theory is also supported by higher prevalence of AhTGc positivity. Further research is needed to investigate the long-term impact of these dietary patterns on iodine status and thyroid function in children. Given our findings, it may also be necessary to consider new guidelines for supplementing children following VG and VN diets to ensure their iodine needs are met.

Iodine Security of the Population: A Modern View of the Problem

Background. Iodine is one of the most important trace elements, without which the normal functioning of our body is impossible, and regular intake of iodine with food is of great importance for maintaining our health. To date, it has been proven that iodine deficiency can have serious consequences for human health at any age, but it is most dangerous for pregnant women, given its effect on fetal development and for children of the first years of life. The article presents up-to-date information on the prevalence of iodine deficiency and iodine deficiency diseases in the territory of the Russian Federation. Purpose. Based on the study of the results of a number of clinical studies, this paper is to determine the prevalence of iodine deficiency in the territory of the Russian Federation, modern methods of its diagnosis and impact on human health, as well as to consider possible ways to correct this condition. Materials and Methods . On the basis of the analysis of the data of modern scientific literature on the prevalence and modern methods of diagnosis of iodine deficiency, and its impact on human health modern methods of determining the iodine security of the population are considered, possible ways to prevent iodine deficiency are studied. Results. The paper presents up-to-date information on the prevalence of iodine deficiency and iodine deficiency diseases in the Russian Federation. Modern methods of determining the iodine security of the population are considered. The greatest attention is paid to the consideration of the method of mass prevention of iodine deficiency using iodized salt.

Iodine status of pregnant women in iodine-sufficient regions: A tertiary care unit experience.

The recommended urinary iodine concentration (UIC) levels in the overall adult population is 100-199 μg/L whereas 150-249 μg/L in pregnant women. The objective is to determine the prevalence and severity of iodine deficiency in pregnant women in Amasya, which is located in the Western Black Sea region in Turkey, where sufficient iodine levels were achieved in the normal population. In this single-center study, we retrospectively searched hospital patient records and identified pregnant women who were assessed for iodine levels between January 2019 and January 2021. A total of 408 pregnant women were found eligible for the study. Thyroid-stimulating hormone (TSH), free triiodothyronine, free thyroxine, antithyroid peroxidase antibodies, and antithyroglobulin antibodies in serum samples and UIC were evaluated and compared between the trimesters. Insufficient iodine intake in pregnancy was defined as UIC <150 μg/L. Median UIC and median TSH levels were 129 (range 45-452) μg/L and 2.98 (range 0.01-71.2) μIU/ml, respectively. 81.1% of pregnant women had UIC <150 μg/L. Iodine intake was adequate in 17.4% of pregnant whereas excessive in 1.5%. Prevalence of iodine deficiency during 1st, 2nd, and 3rd trimesters were 82.1%, 82.4%, and 74.5%, respectively. There was no significant difference in UIC levels between trimesters (P = 0.399). 72.9% of pregnant womens had TSH >2.5 mIU/L in the 1st trimester. Iodine deficiency in pregnancy may exist in an iodine-sufficient population. Appropriate measures must be taken to ensure sufficient iodine levels in these individuals.

Iodine Concentration Effects on Linear Growth of Children after Nutrition Behavior intervention, Central Highland of Ethiopia: A Cluster Randomized Community Trial

Background: To improve the iodine status and growth of children was not documented in Ethiopia. This study aimed to determine the effects of nutrition behavior communication change (BCC) on improving iodine status and growth of children 6 to 59 months.&#x0D; Methods: A community cluster randomized trial with a single treatment arm was conducted from February 2018 to April 2020. “Kebeles” [lower administrative units] were randomly assigned to either the intervention or the control cluster. Mothers and their paired children were randomly selected from kebeles. Anthropometry data and urine samples were collected at baseline and end-line surveys. Percentile rank and Independent t-test were used to determine the difference between arms. Finally, Generalized Estimating Equation (GEE) is used to isolate independent predictors.&#x0D; Results: At baseline, 97.83 % (n = 812) mothers/ caregivers and paired children were enrolled for the trial study, but at the end-line, 88.05% (n =715) of children completed the intervention. Iodine deficiency prevalence was higher (11.82%, n = 96) at baseline and reduced to 6.15 % (n =44) at the end-line. The growth defect among children was 41 %( n = 332) at the baseline and declined to 28.67 %( n=205) at the end-line, while among interventions reduced by more than two times (39% to 12.81%). At the baseline, the median UIC among the intervention group was 106.0µg/L and increased to 207.190µg/L. The prevalence of iodine deficiency among intervention was 14.29% (n = 58) at the baseline and lowered to 3.45% (n=14) at the end-line, but a slight increment observed among control from 9.36% to 9.71% at end-line. The end-line median UIC was very high (210.56µg/L ± 150 compared to the baseline median UIC (107µg/L ± 8.66). Most (43.6%) of the intervention group found in the 4th and 5th percentile ranks factions of UIC by Height (Ht) mean differences. Being an intervention group increased Ht by 10.85cm (β =10.85, Std. E = 0.33). Likewise, for 1µg/l UIC change a 1cm (β = 1.0, p = &lt;0.05) Ht change predicted at the end-line.&#x0D; Conclusions: Findings from this trial enhance nutrition behavior communication to improve the iodine status and growth of young children in the community. Longitudinal studies are needed to determine the level of iodine deficiency disorders in the community.

Minimally Invasive Treatment of Benign Thyroid Nodules

Background. Nodular goitre is the commonest pathology of thyroid gland. According to published evidence, the endemic prevalence of iodine deficiency varies within 19–76 % population. The high rates and lack of symptoms at progressive nodules growth warrant the development of effective organ-preserving treatments. Imaging techniques for local precision targeting of individual lesions enable maximum-preserving interventions at thyroid tissue. Today’s world experience of percutaneous ethanol sclerotherapy and radiofrequency ablation is adequate. However, there exist no clear indications for sclerotherapy and radiofrequency ablation, and their consecutive use has not been assessed.Materials and methods. We analyse minimally invasive organ-preserving treatments of benign thyroid nodules (ethanol sclerotherapy, RFA) in 63 patients at the outpatient and general surgery units of BSMU Clinic and MEGI Medical Centre, Ufa, during February 2019 — December 2020.Results and discussion. Ethanol sclerotherapy was highly effective in 46.5 % patients, as evident from discontinued nodule’s blood supply in CDI and B-mode ultrasound, which remained stable in 10.5 % and restored after 3–4 weeks in 25 % patients. Sclerotherapy in colloid goitre was efficient only in 37.5 % patients. Ethanol sclerotherapy was RFA-followed in 25.4 % patients. RFA was favoured at a low-effective sclerotherapy providing for a weak positive dynamics of nodule size, local parietal blood flow preservation and intranodular vessels recanalisation at re-examination.Conclusion. Sclerotherapy was high-effective in cystic nodules. Radiofrequency ablation can be considered most adequate for treating solid nodules. RFA-followed sclerotherapy is a rational choice in treatment of large cystic nodules (&gt;5 cm3 ).

Prevalence of iodine deficiency among Moroccan women of reproductive age

BackgroundIodine deficiency disorders (IDD) affects nearly 1.9 million people worldwide. Iodine deficiency (ID) remains a public health concern not only for pregnant women, but for women of reproductive age (WRA) as well. This study was planned to evaluate the iodine status and the prevalence of iodine deficiency in a nationally representative sample of Moroccan WRA according to their socio-economic data and living areas.MethodsThis study is a cross-sectional national survey conducted on 1652 WRA aged between 18 and 49 years. Iodine status was assessed by the evaluation of the urinary iodine concentration (UIC) on spot urinary samples, using the Sandell-Kolthoff reaction, and by the estimation of iodine-rich food consumption, using a food frequency questionnaire. The World Health Organization cutoff of a median UIC of < 100 μg/l was used to define ID in the population.ResultsThe median UIC [20th- 80th] was 71.3 μg/l [37.5–123.1] and 71% of participants had UIC < 100 μg/L, indicating insufficient iodine status and mild iodine deficiency. WRA from urban and rural areas showed an UIC median of 75.94 μg/l [41.16–129.97] and 63.40 μg/l [33.81–111.68], respectively. Furthermore, ID prevalence was significantly higher in rural areas (75.6%) as compared to urban areas (67.9%) (p < 0.05). Food frequency questionnaires analyses highlighted that dairy products are the most commonly consumed iodine-rich food, reported to be consumed daily by 43.1% of WRA. Of particular interest, 83.5% of WRA reported a weekly consumption of fish.ConclusionID is still a public health problem in Morocco highlighting the necessity to implement effective national program, including efficient salt iodization, effective nutritional education and awareness, to control iodine deficiency and prevent IDD development.

Trends in Nutritional Biomarkers by Demographic Characteristics Across 14 Years Among US Adults.

Background: Understanding trend in nutritional status is crucial to inform national health priorities to improve diets and reduce related diseases. The present study aimed to analyze trends in the concentrations of all measured nutritional biomarkers and their status among US adults across 14 years.Methods: Trends on the concentrations of nutritional biomarkers and nutritional status evaluated by the prevalence of deficiency, inadequacy, excess, and dyslipidemia were analyzed among US adults in 7 cross-sectional National Health and Nutrition Examination Surveys (NHANES 2003–2016) and by age, sex, race/ethnicity, and socioeconomic status.Results: A total of 38,505 participants (weighted mean age of 47.2 years, 51.4% women) were included in the present study. Across 14 years, increased trends were found in red blood cell (RBC) folate, serum vitamin B12, vitamin D and albumin, the prevalence of iodine deficiency, vitamin B6 inadequacy, and hypophosphatemia, whereas decreased trends were observed in serum vitamin E, phosphorus, total calcium, total protein, apolipoprotein B (Apo B), low-density-lipoprotein cholesterol (LDL-C), triglyceride (TG), total cholesterol (TC), blood lead, cadmium, mercury, and the prevalence of vitamin C deficiency, vitamin D inadequacy, iodine excess, and dyslipidemia with elevated LDL-C, TC, TG, and lowered HDL/LDL. Non-Hispanic blacks (NHB) and participants with low socioeconomic status were accounted for the poor nutritional status of most biomarkers compared to their comparts.Conclusion: Most nutritional biomarkers and their status were improved among US adults from 2003 to 2016, but some specific populations should be paid much attention to improve their nutritional status, especially for NHB and participants with low socioeconomic status.

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.

The Characteristics of Iodine Nutrition Status in China After 20 Years of Universal Salt Iodization: An Epidemiology Study Covering 31 Provinces.

Background: Despite the implementation of the universal salt iodization (USI) program for correction of iodine deficiency in China for ∼20 years, the actual iodine nutrition status of Chinese residents and the prevalence of iodine deficiency and iodine excess are issues that need to be addressed. This nationally representative cross-sectional study was conducted across all 31 provinces of mainland China to gather extensive data on iodine nutrition status and the influential factors. Methods: This study included 78,470 participants, aged 18 years or older, who were interviewed and asked to answer a questionnaire. Urine iodine concentration (UIC) was measured by the inductively coupled plasma mass spectrometry method, and goiter was examined by thyroid ultrasonography. In addition, sixty 9-11 years old school children in each province were randomly selected to evaluate the UIC and thyroid ultrasonography. The iodine nutrition status was determined according to the World Health Organization guidelines. Results: The iodized salt coverage was 95.37%. The median urine iodine (MUI) was 177.89 μg/L (interquartile range [IQR], 117.89-263.90 μg/L) and goiter prevalence was 1.17% (confidence interval [95% CI 0.95-1.43]) in the adult population. The MUI was 199.75 μg/L (IQR, 128.41-303.37 μg/L) in school-age children, and goiter prevalence was 3.50% [95% CI, 2.93-4.13]. The percentage of individuals with UIC <50 μg/L was 3.43%, <20%. Analysis indicated that sex, age, geographic factors, body mass index, and smoking habits influence the iodine nutrition level. Conclusion: The mandatory USI program has successfully eliminated iodine deficiency disorders, and the findings indicate that the iodine nutrition level in the general population is within the safe range.

Prevalence of Iodine Deficiency among School Children from New Settlement in Kyrgyzstan.

This study assesses the status of iodine deficiency among at risk-children and adolescents living in migrant settlements in the Kyrgyz Republic. Children aged 7–15 years from two regional primary schools in the new settlement regions were screened for cognitive and behavioural signs of iodine deficiency using questionnaires. The functional state of the thyroid gland was assessed using ultrasonography and blood tests. Out of 1058 schoolchildren, 15.8% showed signs of iodine deficiency. Female children aged 10–12 years showed a higher prevalence of iodine deficiency. The families of schoolchildren reported limited use of seafood and iodised salt. Children in the migrant regions were at risk of iodine deficiency disorder. Among children, clinical manifestations of iodine deficiency were observed as negative hormonal levels or the presence of goitre. Further investigation on standardised screening instruments for iodine deficiency and the relationship among multilevel analyses are warranted.

Progress towards elimination of IDD in the Islamic Republic of Iran: a KAP survey of iodized salt consumption

It has been recognized for a number of years that iodine deficiency disorders constitute a health problem in the Islamic Republic of Iran. A programme for the prevention of such disorders was established in 1989 and intensive efforts have been made to overcome obstacles hindering its implementation. This study investigates the difficulties encountered, common factors behind the prevalence of iodine deficiency, the progress made in combating it and the results of a nationwide campaign to raise awareness of the need to consume iodized salt. The final part of the study presents general conclusions and recommendations which may be of use to countries facing a similar problem in the field of health and nutrition

Состояние йодного обеспечения детей препубертатного возраста, проживающих на территории Северной Буковины

Актуальность. На Буковине в зависимости от климатогеографических зон наблюдается йодная недостаточность легкой и средней степени тяжести. Оценка экскреции неорганического йода с мочой позволяет проводить мониторинг эпидемиологической ситуации по тяжести йодного дефицита в регионе. Цель — оценить показатели экскреции йода у детей препубертатного возраста, проживающих на территории Северной Буковины (Черновицкая область). Материалы и методы. В рамках 20-кластерного анализа распространенности зоба среди детского населения Черновицкой области обследованы 1973 ребенка в возрасте от 7 до 12 лет и определена концентрация неорганического йода в разовой порции мочи у 197 детей. Полученные результаты обработаны методом статистического вариационного и корреляционного анализа. Результаты. Обследование мануально-пальпаторным методом показало значительную частоту зоба среди детей Буковины — 17,6%. Тиреомегалия среди детей референтной группы зарегистрирована в 15,1 % случаев. Медиана йодурии в обследованной популяции в целом составляет 60,4 мкг/л. В среднем распространенность йодного дефицита составила 59,70 ± 1,82 %, частота тяжелой йодной недостаточности не превысила 5,22 ± 1,30 %. Анализируя степень йодного обеспечения организма детей в зависимости от географических зон проживания, делаем вывод, что у детей, проживающих в равнинной зоне, и у детей г. Черновцов наблюдается дефицит йода легкой степени (медиана экскреции йода составляет 72,2 и 70,4 мкг/л соответственно), а у детей горных районов — йодный дефицит средней степени тяжести (медиана экскреции йода — 42,9 мкг/л). В среднем распространенность йодного дефицита составила 59,70 ± 1,82 %, а избыточного содержания йода в моче — 18,70 ± 2,49 %. Причем показатель тяжелой йодной недостаточности не превысил 5,22 ± 1,30 %. Выводы. У большинства детей, проживающих на территории Северной Буковины, медиана йодурии снижена. У 18,7 % детей показатель йодурии более 300 мкг/л, что требует дальнейшего мониторинга.

Iodine Nutritional Status and Related Factors among Chinese School-Age Children in Three Different Areas: A Cross-Sectional Study.

We evaluated the iodine nutritional status and related factors among school-age children based on the 2016 National Nutrition and Health Surveillance of Children and Lactating Women; 3808 children from Hebei, Guangxi, and Zhejiang province were included in the study. Urinary iodine concentration (UIC), thyroid-stimulating hormone (TSH), body mass index (BMI), vitamin A (VA), and vitamin D (VD) were measured. The abnormal rate of UIC and TSH were assessed. Relationships between UIC/TSH and the possible factors were analyzed. The overall median UIC was 185.14 µg/L, and the median UIC of children aged 8–10 was 164.60 µg/L. Prevalence of iodine deficiency and excess was 13.84% and 14.36%, respectively, and 12.87% of children showed TSH excess. UIC, as well as the abnormal rates of iodine deficiency (ID) and TSH, were significantly different among the three provinces. The median UICs and excess rates increased with age, reaching 211.45 µg/L and 21.35% at age of 14~, while TSH showed the opposite trend. Overweight children tended to have lower UIC and higher TSH. Higher UIC and TSH were found in VA sufficient group (p < 0.01). Further, the VD deficient group had a higher TSH compared to the sufficient group (p < 0.01). Moreover, UI and TSH distribution was obviously different among different vitamin A/D status (p < 0.05). Although the median UIC of school-age children was optimal, there were pockets of inadequate and excessive UI in the three provinces. Compared to the national IDD monitoring results in 2014, the iodine nutritional status of children was greatly improved. Considerations of region, age, BMI, VA, or VD are needed in the future iodine evaluation and surveillance.

Low urinary selenium levels are associated with iodine deficiency in Brazilian schoolchildren and adolescents

Selenium (Se) and iodine (Io) are important micronutrients for the proper functioning of the thyroid gland, as they are crucial for the synthesis and activation of the thyroid hormones (TH) triiodothyronine (T3) and thyroxine (T4). To evaluate the Se and Io nutritional status among schoolchildren. Cross-sectional, descriptive and analytical study conducted in 982 schoolchildren aged 6-14 years from public schools in the state of Bahia, Brazil. Sociodemographic and anthropometric variables, as well as urinary Se (USC) and Io concentrations (UIC) using the inductively coupled plasma mass spectrometry (ICP-MS) method and thyroid-stimulating hormone (TSH) from filter paper blood collection, were evaluated. The median USC and UIC were 38.7 and 210.0 (IQR: 26.8-52.9 and 129.3-334.1 μg/L, respectively). The prevalence of iodine deficiency and excessive UIC were observed in 17.1% and 30.9% of schoolchildren, respectively. Concomitant low USC and IoD was found in 3.9% of schoolchildren. There was a positive correlation between USC and UIC (r = 0.60; p = 0.00). The median TSH was 0.95 (IQR: 0.69-1.30 µUI/L). This study demonstrates that USC is a good biomarker for assessing Se status, meantime more studies are needed to establish cutoff USC in child population. Despite adequate median intake, a subgroup of schoolchildren had IoD and low USC. The correlation between UIC and USC point at the importance of two micronutrients, raising the question whether measuring Se should be included in monitoring programs that address the prevention of nutritional disturbances.

Prevalence of iodine deficiency among pregnant women in Gwembe and Sinazongwe districts of Southern Province, Zambia: a cross-sectional study

BackgroundMaternal iodine deficiency is one of the common causes of morbidity and mortality during pregnancy. Maternal iodine deficiency during pregnancy is associated with a number of adverse outcomes such as abortion, stillbirth, congenital anomalies, perinatal mortality and irreversible mental retardation. A study conducted in Zambia among pregnant women in 2013 on the prevalence of iodine deficiency showed that iodine deficiency was not a public health concern. The previous study used Urine Iodine concentration (UIC) as a marker of iodine deficiency among the pregnant women. Our study was conducted to assess the prevalence of iodine deficiency among pregnant women in Gwembe and Sinazongwe districts of Southern Province, Zambia, using urine iodine concentration and goitre presence by manual palpation.MethodsWe carried out a community based, cross sectional study in rural areas of Gwembe and Sinazongwe districts between April 2016 to March 2018. Data were collected from 412 pregnant women by a multistage cluster sampling technique. The presence of a goitre was examined by manual palpation and urinary iodine concentration was determined by the Ultra Violet Method using PerkinElmer Labda UV Spectrometer equipment made in Jena Germany (Model 107,745). As part of the existing baseline data, we used results of a 2013 countrywide study (n = 489) for household salt iodine content which showed a greater than 40 ppm at 76.2%, between 15 and 40 ppm at 19.21% and less than 15 ppm at 4.59%. Statistical analysis was done using Stata version 14.0. The outputs of analysis are presented as median and Interquartile range (IQR) as the urine data were not normally distributed. Further, the categorical and independent variables were presented as proportions (percentages) to describe the distribution and trends in the target sample population.ResultsThe median Urine Iodine concentration (UIC) of the pregnant women was 150 μg/L (Interquartile Range (IQR): 100–200 μg/L). Based on the UIC, There were 49% pregnant women who had inadequate iodine intake with urine iodine concentration of less than 150 μg/L, 34.0% had UIC of 150–249 μg/L indicating adequate iodine intake, 13.0% with UIC of 250–499 μg/L indicating more than adequate iodine intake, and 5.0% with UIC of above 500 μg/L indicating excessive iodine intake. To determine whether the women had access to iodized salt, we used baseline data from 2013 Zambia national survey for iodine concentration in household salt samples as being an average of 40 ppm, which also showed that 95.41% households consumed adequately iodized salt (≥15 ppm). The prevalence of goitre in our study was very low at 0.02% among the pregnant women of all ages who participated in the study (18–49 years).ConclusionIodine deficiency was still not a public health concern among the pregnant women of Gwembe and Sinazongwe districts of Southern Province in Zambia. Goitre prevalence has remained very low in this study area. The UIC and goitre observations were consistent with the Zambia National Food and Nutrition Commission findings in 2013 report. However, our study showed more pregnant women with insufficient than adequate iodine status indicating the risk of developing IDD is still high in this region. It also reinforces the argument that strengthening of the existing salt iodization program is needed in order to make a homogenous iodated salt available to the communities. The National Food and Nutrition Commission of Zambia needs to find innovative ways of sensitizing people about the adverse effects of IDDs and how these could be prevented. It is recommended that iodine supplementation be introduced as part of the package of Antenatal clinic care for all pregnant women.

Impact of iodine supplementation during preconception, pregnancy and lactation on maternal thyroid homeostasis and offspring psychomotor development: protocol of the IodineMinho prospective study

BackgroundIodine deficiency is the most common cause of preventable brain harm and cognitive impairment in children. Portuguese women of childbearing age, pregnant women and their progeny were shown to have inadequate iodine intake. Consequently, the Portuguese Health Authorities have recommended a daily supplementation with 150–200 µg iodine in preconception, pregnancy, and lactation. The IodineMinho study intends to evaluate whether (i) this recommendation impacted on the prevalence of iodine deficiency in pregnant women from the Minho region of Portugal, (ii) the time of initiation of iodine supplementation (if any) influences the serum levels of thyroid hormones at several intervals during pregnancy and (iii) there are serum thyroid-hormone parameters in the 1st trimester of pregnancy that predict psychomotor development of the child at 18 months of age.MethodsMost Portuguese women are followed throughout pregnancy in community Family Health Units, where family physicians may choose to follow the National recommendation or other, concerning iodine sufficiency. This study will recruit women (N = 304) who intend to become pregnant or are already pregnant from 10 representative Units. Physician’s approach and prescriptions, sociodemographic, nutrition and clinical information will be obtained at baseline and throughout pregnancy. To evaluate endocrine function, blood and urine samples will be collected at recruitment, once in each trimester of pregnancy, at delivery and 3 months after delivery. Breastmilk samples will be collected for iodine and energy content analysis. Children will be evaluated for psychomotor development at 18 months. Maternal thyroid volume will be evaluated by ultrasound scan at baseline, in the 3rd trimester and at 3 months after delivery.DiscussionIodine deficiency early during development precludes children from achieving full intellectual capabilities. This protocol describes a study that is innovative and unique in its detailed and comprehensive evaluation of maternal and child endocrine and psychomotor parameters. By evaluating the effectiveness of the iodine supplementation recommendation, it will contribute to the public health systems’ efforts to provide excellence in maternal and infant care.Trial registrationClinicalTrials.gov, NCT04288531. Registered 28 February 2020-Retrospectively registered.