ABSTRACT
Background: Salt fortification with iron is a potential strategy to increase population-level iron intake. The current evidence regarding double-fortified salt (DFS) in improving iron nutrition status is equivocal. Objective: To study the efficacy of DFS as compared to iodine fortified salt (IS) in improving iron nutrition status. Methods: Randomized controlled trials comparing DFS and IS until August 2016 were systematically searched across multiple databases to assess for change in mean hemoglobin (Hb), prevalence of anemia, iron deficiency (ID), ID anemia (IDA), serum ferritin, and serum transferrin receptor (TfR). Meta-analysis was performed using R software. Results: Of the initial 215 articles retrieved using the predetermined search strategy, data from 10 comparisons of DFS and IS across 8 randomized controlled trials are included. There was significant heterogeneity across included studies and the studies were of low to very low quality as per GRADE criteria. DFS significantly increased mean Hb by 0.44 g/dl (95% confidence interval [CI]: 0.16, 0.71) and significantly decreased anemia (risk difference ?0.16; 95% CI: ?0.26, ?0.06) and ID (risk difference ?0.20; 95% CI: ?0.32, ?0.08) as compared to IS. There was no statistically significant difference in change in ferritin levels (mean difference 0.62 ?g/L; 95% CI: ?0.12, 1.37), serum TfR levels (mean difference ?0.23 mg/dL; 95% CI: ?0.85, 0.38), and IDA (risk difference ?0.08; 95% CI: ?0.28, 0.11). Conclusion: DFS is a potentially efficacious strategy of addressing anemia as a public health problem at population level. There is a need for effectiveness trials before DFS can be scaled up in program mode at population level.
ABSTRACT
OBJECTIVE To analyze if the nutritional status of children aged less than five years is related to the biological conditions of their mothers, environmental and socioeconomic factors, and access to health services and social programs.METHODS This cross-sectional population-based study analyzed 664 mothers and 790 children using canonical correlation analysis. Dependent variables were characteristics of the children (weight/age, height/age, BMI/age, hemoglobin, and retinol serum levels). Independent variables were those related to the mothers' nutritional status (BMI, hemoglobin, and retinol serum levels), age, environmental and socioeconomic factors and access to health service and social programs. A < 0.05 significance level was adopted to select the interpreted canonical functions (CF) and ± 0.40 as canonical load value of the analyzed variables.RESULTS Three canonical functions were selected, concentrating 89.9% of the variability of the relationship among the groups. In the first canonical function, weight/age (-0.73) and height/age (-0.99) of the children were directly related to the mother's height (-0.82), prenatal appointments (-0.43), geographical area of the residence (-0.41), and household incomeper capita (-0.42). Inverse relationship between the variables related to the children and people/room (0.44) showed that the larger the number of people/room, the poorer their nutritional status. Rural residents were found to have the worse nutritional conditions. In the second canonical function, the BMI of the mother (-0.48) was related to BMI/age and retinol of the children, indicating that as women gained weight so did their children. Underweight women tended to have children with vitamin A deficiency. In the third canonical function, hemoglobin (-0.72) and retinol serum levels (-0.40) of the children were directly related to the mother's hemoglobin levels (-0.43).CONCLUSIONS Mothers and children were associated concerning anemia, vitamin A deficiency and anthropometric markers. Living in rural areas is a determining factor for the families health status.
OBJETIVO Analisar se o estado nutricional de crianças menores de cinco anos está relacionado a condições biológicas de suas mães, a fatores ambientais e socioeconômicos e ao acesso a serviços de saúde e programas sociais.MÉTODOS Este estudo transversal, de base populacional, analisou 664 mães e 790 filhos, utilizando análise de correlação canônica, tendo como variáveis dependentes as características dos filhos (peso/idade, estatura/idade, índice de massa corporal/idade, níveis de hemoglobina e retinol sérico). Como variáveis independentes, as relacionadas ao estado nutricional das mães (índice de massa corporal, níveis de hemoglobina e retinol sérico), idade materna, fatores ambientais, socioeconômicos, acesso a serviços de saúde e programas sociais. Adotou-se nível de significância < 0,05 para seleção das funções canônicas interpretadas e ± 0,40 como valor de carga canônica das variáveis analisadas.RESULTADOS Foram selecionadas três funções canônicas, concentrando 89,9% da variabilidade da relação entre os grupos. Na primeira, peso/idade (-0,73) e estatura/idade (-0,99) dos filhos relacionaram-se diretamente com estatura materna (-0,82), consultas pré-natais (-0,43), área geográfica de moradia (-0,41) e renda familiar per capita (-0,42). A relação inversa entre variáveis referentes aos filhos e moradores/cômodo (0,44) mostrou que, quanto maior o número de pessoas/cômodo, mais deficiente o estado nutricional. Residentes na área rural apresentaram piores situações nutricionais. Na segunda função, índice de massa corporal materno (-0,48) relacionou-se com índice de massa corporal/idade e retinol dos filhos, indicando que, à medida que as mulheres aumentavam de peso, o mesmo acontecia com seus filhos e que mulheres de baixo peso tendiam a ter filhos com deficiência de vitamina A. Na terceira função, os níveis de hemoglobina (-0,72) e retinol (-0,40) dos filhos estiveram diretamente relacionados ao nível de hemoglobina materna (-0,43).CONCLUSÕES Mães e filhos estavam associados em relação à anemia, deficiência de vitamina A e marcadores antropométricos. Residir na área rural ainda é um discriminante na situação de saúde das famílias.