10 results on '"Chagumaira, C."'
Search Results
2. Cereal grain mineral micronutrient and soil chemistry data from GeoNutrition surveys in Ethiopia and Malawi
- Author
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Kumssa, D. B., Mossa, A. W., Amede, T., Ander, E. L., Bailey, E. H., Botoman, L., Chagumaira, C., Chimungu, J. G., Davis, K., Gameda, S., Haefele, S. M., Hailu, K., Joy, E. J. M., Lark, R. M., Ligowe, I. S., McGrath, S. P., Milne, A., Muleya, P., Munthali, M., Towett, E., Walsh, M. G., Wilson, L., Young, S. D., Haji, I. R., Broadley, M. R., Gashu, D., and Nalivata, P. C.
- Published
- 2022
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3. Decisions, uncertainty and spatial information
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Lark, R.M., Chagumaira, C., and Milne, A.E.
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- 2022
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4. The nutritional quality of cereals varies geospatially in Ethiopia and Malawi
- Author
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Gashu, D., Nalivata, P. C., Amede, T., Ander, E. L., Bailey, E. H., Botoman, L., Chagumaira, C., Gameda, S., Haefele, S. M., Hailu, K., Joy, E. J. M., Kalimbira, A. A., Kumssa, D. B., Lark, R. M., Ligowe, I. S., McGrath, S. P., Milne, A. E., Mossa, A. W., Munthali, M., Towett, E. K., Walsh, M. G., Wilson, L., Young, S. D., and Broadley, M. R.
- Published
- 2021
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5. Soil and landscape factors influence geospatial variation in maize grain zinc concentration in Malawi
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Botoman, L., Chagumaira, C., Mossa, A. W., Amede, T., Ander, E. L., Bailey, E. H., Chimungu, J. G., Gameda, S., Gashu, D., Haefele, S. M., Joy, E. J. M., Kumssa, D. B., Ligowe, I. S., McGrath, S. P., Milne, A. E., Munthali, M., Towett, E., Walsh, M. G., Wilson, L., Young, S. D., Broadley, M. R., Lark, R. M., and Nalivata, P. C.
- Subjects
Malawi ,Minerals ,Soil ,Zinc ,Multidisciplinary ,Humans ,Pentetic Acid ,Edible Grain ,Zea mays - Abstract
Dietary zinc (Zn) deficiency is widespread globally, and in particular among people in sub-Saharan Africa (SSA). In Malawi, dietary sources of Zn are dominated by maize and spatially dependent variation in grain Zn concentration, which will affect dietary Zn intake, has been reported at distances of up to ~ 100 km. The aim of this study was to identify potential soil properties and environmental covariates which might explain this longer-range spatial variation in maize grain Zn concentration. Data for maize grain Zn concentrations, soil properties, and environmental covariates were obtained from a spatially representative survey in Malawi (n = 1600 locations). Labile and non-labile soil Zn forms were determined using isotopic dilution methods, alongside conventional agronomic soil analyses. Soil properties and environmental covariates as potential predictors of the concentration of Zn in maize grain were tested using a priori expert rankings and false discovery rate (FDR) controls within the linear mixed model (LMM) framework that informed the original survey design. Mean and median grain Zn concentrations were 21.8 and 21.5 mg kg−1, respectively (standard deviation 4.5; range 10.0–48.1). A LMM for grain Zn concentration was constructed for which the independent variables: soil pH(water), isotopically exchangeable Zn (ZnE), and diethylenetriaminepentaacetic acid (DTPA) extractable Zn (ZnDTPA) had predictive value (p
- Published
- 2021
6. Spatial prediction of the concentration of selenium (Se) in grain across part of Amhara Region, Ethiopia
- Author
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Gashu, D., primary, Lark, R.M., additional, Milne, A.E., additional, Amede, T., additional, Bailey, E.H., additional, Chagumaira, C., additional, Dunham, S.J., additional, Gameda, S., additional, Kumssa, D.B., additional, Mossa, A.W., additional, Walsh, M.G., additional, Wilson, L., additional, Young, S.D., additional, Ander, E.L., additional, Broadley, M.R., additional, Joy, E.J.M., additional, and McGrath, S.P., additional
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- 2020
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7. A pilot survey of selenium status and its geospatial variation among children and women in three rural districts of Zimbabwe.
- Author
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Mutonhodza B, Chagumaira C, Dembedza MP, Joy EJM, Manzeke-Kangara MG, Njovo H, Nyadzayo TK, Lark RM, Kalimbira AA, Bailey EH, Broadley MR, Matsungo TM, and Chopera P
- Abstract
Introduction: Selenium (Se) deficiency is increasingly recognized as a public health problem in sub-Saharan Africa., Methods: The current cross-sectional study assessed the prevalence and geospatial patterns of Se deficiency among children aged 6-59 months ( n = 741) and women of 15-49 years old ( n = 831) selected by simple random sampling in rural Zimbabwe (Murewa, Shamva, and Mutasa districts). Venous blood samples were collected and stored according to World Health Organization guidelines. Plasma Se concentration was determined by inductively coupled plasma-mass spectrometry., Results: Median, Q1, and Q3 plasma Se concentrations were 61.2, 48.7, and 73.3 μg/L for women and 40.5, 31.3, and 49.5 μg/L for children, respectively. Low plasma Se concentrations (9.41 μg/L in children and 10.20 μg/L in women) indicative of severe Se deficiency risk was observed. Overall, 94.6% of children and 69.8% of women had sub-optimal Se status defined by plasma Se concentrations of <64.8 μg/L and <70 μg/L, respectively., Discussion: High and widespread Se deficiency among women and children in the three districts is of public health concern and might be prevalent in other rural districts in Zimbabwe. Geostatistical analysis by conditional kriging showed a high risk of Se deficiency and that the Se status in women and children in Murewa, Shamva, and Mutasa districts was driven by short-range variations of up to ⁓12 km. Selenium status was homogenous within each district. However, there was substantial inter-district variation, indicative of marked spatial patterns if the sampling area is scaled up. A nationwide survey that explores the extent and spatial distribution of Se deficiency is warranted., Competing Interests: The authors declare that the research was conducted in the absence of any commercial or financial relationships that could be construed as a potential conflict of interest., (Copyright © 2023 Mutonhodza, Chagumaira, Dembedza, Joy, Manzeke-Kangara, Njovo, Nyadzayo, Lark, Kalimbira, Bailey, Broadley, Matsungo and Chopera.)
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- 2023
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8. Mineral micronutrient status and spatial distribution among the Ethiopian population.
- Author
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Belay A, Gashu D, Joy EJM, Lark MR, Chagumaira C, Zerfu D, Ander LE, Young SD, Bailey EH, and Broadley MR
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- Humans, Female, Micronutrients, Minerals, Ethiopia, Nutritional Status, Trace Elements, Malnutrition epidemiology
- Abstract
Multiple micronutrient deficiencies are widespread in Ethiopia. However, the distribution of Se and Zn deficiency risks has previously shown evidence of spatially dependent variability, warranting the need to explore this aspect for wider micronutrients. Here, blood serum concentrations for Ca, Mg, Co, Cu and Mo were measured ( n 3102) on samples from the Ethiopian National Micronutrient Survey. Geostatistical modelling was used to test spatial variation of these micronutrients for women of reproductive age, who represent the largest demographic group surveyed ( n 1290). Median serum concentrations were 8·6 mg dl
-1 for Ca, 1·9 mg dl-1 for Mg, 0·4 µg l-1 for Co, 98·8 µg dl-1 for Cu and 0·2 µg dl-1 for Mo. The prevalence of Ca, Mg and Co deficiency was 41·6 %, 29·2 % and 15·9 %, respectively; Cu and Mo deficiency prevalence was 7·6 % and 0·3 %, respectively. A higher prevalence of Ca, Cu and Mo deficiency was observed in north western, Co deficiency in central and Mg deficiency in north eastern parts of Ethiopia. Serum Ca, Mg and Mo concentrations show spatial dependencies up to 140-500 km; however, there was no evidence of spatial correlations for serum Co and Cu concentrations. These new data indicate the scale of multiple mineral micronutrient deficiency in Ethiopia and the geographical differences in the prevalence of deficiencies suggesting the need to consider targeted responses during the planning of nutrition intervention programmes.- Published
- 2022
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9. Zinc deficiency is highly prevalent and spatially dependent over short distances in Ethiopia.
- Author
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Belay A, Gashu D, Joy EJM, Lark RM, Chagumaira C, Likoswe BH, Zerfu D, Ander EL, Young SD, Bailey EH, and Broadley MR
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- Adolescent, Adult, Age Factors, Child, Ethiopia, Female, Humans, Male, Middle Aged, Prevalence, Zinc blood, Zinc deficiency
- Abstract
Zinc (Zn) is an essential nutrient for human health. In Ethiopia, a high prevalence of Zn deficiency has been reported. To explore demographic variation and spatial dependencies in the Zn status of the Ethiopian population, we analyzed archived serum samples (n = 3373) from the 2015 Ethiopian National Micronutrient Survey (ENMS), a cross-sectional survey of young children, school-age children, women of reproductive age (WRA) and men conducted in all 9 regions and two city administration of Ethiopia. Serum Zn concentrations, measured using inductively coupled plasma-mass spectrometry (ICPMS), were compared to thresholds based on age, sex, fasting status, and time of blood collection, after adjusting for inflammation status. Median serum Zn concentration of the population was 57.5 μg dL
-1 . Overall, it is estimated that 72% of the population was Zn deficient, with high prevalence in all demographic groups. Spatial statistical analysis showed that there was spatial dependence in Zn status of WRA at distances of up to 45 km. Zinc deficiency is spatially dependent over short distances. Although WRA in most areas are likely to be Zn deficient, prevalence of deficiency varies at regional scale and between rural and urban inhabitants, suggesting there is scope to explore drivers of this variation, prioritize nutritional interventions, and to design more representative surveillance programs.- Published
- 2021
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10. Selenium Deficiency Is Widespread and Spatially Dependent in Ethiopia.
- Author
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Belay A, Joy EJM, Chagumaira C, Zerfu D, Ander EL, Young SD, Bailey EH, Lark RM, Broadley MR, and Gashu D
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- Adolescent, Adult, Child, Child, Preschool, Cross-Sectional Studies, Ethiopia epidemiology, Female, Glutathione Peroxidase metabolism, Humans, Iodide Peroxidase metabolism, Male, Micronutrients blood, Micronutrients deficiency, Middle Aged, Young Adult, Malnutrition epidemiology, Selenium blood, Selenium deficiency
- Abstract
: Selenium (Se) is an essential element for human health and livestock productivity. Globally, human Se status is highly variable, mainly due to the influence of soil types on the Se content of crops, suggesting the need to identify areas of deficiency to design targeted interventions. In sub-Saharan Africa, including Ethiopia, data on population Se status are largely unavailable, although previous studies indicated the potential for widespread Se deficiency. Serum Se concentration of a nationally representative sample of the Ethiopian population was determined, and these observed values were combined with a spatial statistical model to predict and map the Se status of populations across the country. The study used archived serum samples ( n = 3 2 69 ) from the 2015 Ethiopian National Micronutrient Survey (ENMS). The ENMS was a cross-sectional survey of young and school-age children, women and men. Serum Se concentration was measured using inductively coupled plasma mass spectrometry (ICPMS). The national median (Q1, Q3) serum Se concentration was 87.7 (56.7, 123.0) μg L
-1 . Serum Se concentration differed between regions, ranging from a median (Q1, Q3) of 54.6 (43.1, 66.3) µg L-1 in the Benishangul-Gumuz Region to 122.0 (105, 141) µg L-1 in the Southern Nations, Nationalities, and Peoples' Region and the Afar Region. Overall, 35.5% of the population were Se deficient, defined as serum Se <70 µg L-1 . A geostatistical analysis showed that there was marked spatial dependence in Se status, with serum concentrations greatest among those living in North-East and Eastern Ethiopia and along the Rift Valley, while serum Se concentrations were lower among those living in North-West and Western Ethiopia. Selenium deficiency in Ethiopia is widespread, but the risk of Se deficiency is highly spatially dependent. Policies to enhance Se nutrition should target populations in North-West and Western Ethiopia., Competing Interests: The authors declare no conflicts of interest.- Published
- 2020
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