Urinary iodine concentrations of pregnant women in rural Bangladesh: A longitudinal study

Rydbeck, Filip; Bottai, Matteo; Tofail, Fahmida; Persson, Lars‐Åke; Kippler, Maria

doi:10.1038/jes.2013.79

Cited by 25 publications

(17 citation statements)

References 27 publications

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“…The present study also showed a weak positive association between BMI and UIC, which correlates with previous reports from Bangladesh and Romania [64,65]. A possible explanation could be that pregnant and non-pregnant women with high BMI were consuming higher foods rich in iodine than lean individuals.…”

Section: Discussionsupporting

confidence: 90%

Iodine adequacy in reproductive age and pregnant women living in the Western region of Saudi Arabia

Azzeh

Refaat

2020

Preprint

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Background: Despite the serious maternal and foetal complications associated with iodine deficiency during pregnancy, surveys related to pregnant women in the Kingdom of Saudi Arabia (KSA) are lacking. This study, therefore, measured urine iodine concentrations (UIC) alongside the potential socioeconomic factors contributing towards iodine inadequacy in reproductive age and pregnant Saudi women from the Western province of KSA. Methods: Spot urine samples were collected from 1222 pregnant and 400 age-matched non-pregnant/non-lactating reproductive age women. The socioeconomic characteristics were obtained through a structured questionnaire. The WHO criteria for iodine sufficiency in non-pregnant (100–199 μg/L) and pregnant (150–249 μg/L) women were applied. Results: The median UIC in the non-pregnant women (101.64 μg/L; IQR: 69.83 – 143.55) was at the lowermost WHO recommended cut-off, whereas the pregnant group were iodine deficient (112.99 μg/L; IQR: 81.01 – 185.57). Moreover, the median UIC was below adequacy across the different trimesters. Multiparity (OR = 3.091; 95%CI: 1.707–5.598) and earning below the minimum wage (2.520; 95%CI: 1.038–6.119) significantly increased the risk of iodine deficiency only in the non-pregnant women. Passive smoking, however, was an independent risk factor for iodine deficiency in the non-pregnant (OR = 1.818; 95%CI: 1.097–3.014) and pregnant (OR = 1.653; 95%CI: 1.043–2.618) groups. The use of non-iodised salt also significantly increased the risk of iodine deficiency in the non-pregnant (OR = 2.052; 95%CI: 1.118–3.766) and pregnant women (OR = 3.813; 95%CI: 1.992–7.297), whereas iodine supplements significantly lowered the risk in both groups (OR = 0.364; 95%CI: 0.172–0.771 and OR = 0.002; 95%CI: 0.001–0.005, respectively). Moreover, BMI correlated independently and significantly with median UIC in the non-pregnant in both study populations. Conclusions: This study is the first to show borderline iodine sufficiency in reproductive age Saudi women from the Western province, whereas mild iodine deficiency was observed in the pregnant population and could represent a serious public health problem. This study also advocates the necessity to establish routine iodine dietary advice services by the health authorities to foster adequate iodine intake in pregnant women to avoid the perilous maternal-foetal health consequences of iodine deficiency.

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Section: Discussionsupporting

confidence: 90%

Iodine adequacy in reproductive age and pregnant women living in the Western region of Saudi Arabia

Azzeh

Refaat

2020

Preprint

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“…The present study also showed a weak positive association between BMI and UIC, which correlates with previous reports from Bangladesh and Romania [54,55]. A possible explanation could be that pregnant and non-pregnant women with high BMI were consuming higher foods rich in iodine than lean individuals.…”

Section: Discussionsupporting

confidence: 90%

Iodine adequacy in reproductive age women living in the Western region of Saudi Arabia

Azzeh

Refaat

2019

Preprint

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Background Despite the significance of iodine deficiency in women of reproductive age due its associated serious maternal and foetal complications, surveys related to this vulnerable population in the Kingdom of Saudi Arabia (KSA) are lacking. This study, therefore, aimed to measure the frequency alongside the potential socioeconomic factors contributing towards iodine inadequacy in Saudi women of childbearing age from the Western province of KSA.Methods Urinary iodine concentrations IUIC) were measured in random spot samples collected from 1222 pregnant women and 400 age-matched non-pregnant/non-lactating women. The socioeconomic characteristics were obtained through a structured questionnaire. The classification of iodine sufficiency was based on the WHO criteria for UIC in pregnant (150–249 μg/L) and non-pregnant women (100–199 μg/L).Results The UIC median in the non-pregnant women (101.64 μg/L; IQR: 73.72) was at the lowest WHO recommended cut-off. The pregnant women, on the other hand, had a median UIC (112.99 μg/L; IQR: 104.56) markedly below the minimal WHO limit for pregnancy. Coherently, the median IUC was below adequacy across the trimesters and was lowest during the first trimester. Additionally, 49.7% (n = 199) of the non-pregnant and 62.5% (n = 764) of pregnant women were iodine deficient as per the WHO criteria. While pregnancy (OR = 4.3; 95%CI: 3.08–5.96) and using non-iodised salt (OR = 1.96; 95%CI: 1.35–2.83) significantly increased the risk of iodine deficiency, the intake of iodine supplements significantly lowered the risk (OR = 0.010; 95%CI: 0.006–0.017). On the other hand, the intake of iodine above requirement was observed in 8.5% and 4.2% of the non-pregnant and pregnant women, respectively. Moreover, BMI was the sole independent factor increasing the odds (OR = 1.061; 95%CI: 1.010–1.114) of taking iodine above requirements.Conclusions This study is the first to show high prevalence of mild iodine deficiency among reproductive age Saudi women, which could represent a serious public health problem. This study also advocates the necessity to establish routine iodine dietary advice services by the health authorities to foster adequate iodine intake in pregnant women to avoid the perilous maternal-foetal health consequences of iodine deficiency.

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“…Cadmium, selenium and iodine in urine were measured with inductively coupled plasma mass spectrometry (ICPMS; Agilent 7700×, Agilent Technologies, Tokyo, Japan), equipped with an octopole reaction system, at Karolinska Institutet, Sweden [19, 20]. When measuring cadmium and selenium the urine samples were diluted 1:10 in 1 % nitric acid (prepared from 65 % suprapur, Merck, Darmstadt, Germany).…”

Section: Methodsmentioning

confidence: 99%

Impact of prenatal exposure to cadmium on cognitive development at preschool age and the importance of selenium and iodine

et al. 2016

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The evidence regarding a potential link of low-to-moderate iodine deficiency, selenium status, and cadmium exposure during pregnancy with neurodevelopment is either contradicting or limited. We aimed to assess the prenatal impact of cadmium, selenium, and iodine on children’s neurodevelopment at 4 years of age. The study included 575 mother–child pairs from the prospective “Rhea” cohort on Crete, Greece. Exposure to cadmium, selenium and iodine was assessed by concentrations in the mother’s urine during pregnancy (median 13 weeks), measured by ICPMS. The McCarthy Scales of Children’s Abilities was used to assess children’s general cognitive score and seven different sub-scales. In multivariable-adjusted regression analysis, elevated urinary cadmium concentrations (≥0.8 µg/L) were inversely associated with children’s general cognitive score [mean change: −6.1 points (95 % CI −12; −0.33) per doubling of urinary cadmium; corresponding to ~0.4 SD]. Stratifying by smoking status (p for interaction 0.014), the association was restricted to smokers. Urinary selenium was positively associated with children’s general cognitive score [mean change: 2.2 points (95 % CI −0.38; 4.8) per doubling of urinary selenium; ~0.1 SD], although the association was not statistically significant. Urinary iodine (median 172 µg/L) was not associated with children’s general cognitive score. In conclusion, elevated cadmium exposure in pregnancy of smoking women was inversely associated with the children’s cognitive function at pre-school age. The results indicate that cadmium may adversely affect neurodevelopment at doses commonly found in smokers, or that there is an interaction with other toxicants in tobacco smoke. Additionally, possible residual confounding cannot be ruled out.Electronic supplementary materialThe online version of this article (doi:10.1007/s10654-016-0151-9) contains supplementary material, which is available to authorized users.

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Urinary iodine concentrations of pregnant women in rural Bangladesh: A longitudinal study

Cited by 25 publications

References 27 publications

Iodine adequacy in reproductive age and pregnant women living in the Western region of Saudi Arabia

Iodine adequacy in reproductive age and pregnant women living in the Western region of Saudi Arabia

Iodine adequacy in reproductive age women living in the Western region of Saudi Arabia

Impact of prenatal exposure to cadmium on cognitive development at preschool age and the importance of selenium and iodine

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