Anemia, deficiencia de hierro y factores asociados en niños cubanos de 6 a 59 meses

Introducción: La principal causa de anemia en los preescolares es la deficiencia dietética de hierro, pero existen otras condiciones asociadas y no evaluadas. Objetivo: Estimar la prevalencia de anemia y deficiencia de hierro en niños de 6 a 59 meses y su asociación con inflamación, sobrepeso global, ingestión de alimentos y nivel de instrucción materno. Métodos: Se realizó un estudio transversal nacional, con determinaciones de hemoglobina, ferritina, receptores de transferrina, proteína C reactiva y alfa-1 glicoproteína ácida. Se evaluó el estado nutricional, dieta y nivel de instrucción de la madre. Resultados: Se estudiaron 1417 niños. La prevalencia de anemia fue de un 22,5 %, la de deficiencia de hierro, de un 35,6 % y la de disfunción eritropoyética, de un 13,3 %; con inflamación 37,6 % y prevalencia de sobrepeso global 7,5 %. La anemia estuvo asociada al déficit de hierro OR = 2,07(1,45-2,97) y la inflamación OR = 2,01(1,45-2,78). No se encontraron asociaciones entre la anemia y el déficit de hierro con el sobrepeso global. El bajo consumo de huevos OR = 1,84 (IC95 %1,39-2,43), frutas OR = 1,73 (IC95 %1,29-2,34) y leguminosas OR = 1,68 (IC95 %1,25-2,25) resultaron ser un factor de riesgo de anemia. El análisis de regresión logística mostró que la anemia estaba asociada al grupo menor de 2 años, deficiencia de hierro, inflamación y bajo consumo de frutas; y el sobrepeso global fue un factor de protección. Conclusiones: La anemia y deficiencia de hierro clasifican como problemas de salud pública moderados asociados a la inflamación. El grupo menor de dos años y el bajo consumo de frutas resultó ser un factor de riesgo y el sobrepeso global resultó un factor de protección para la anemia.

Introduction: The main cause of anemia in preschoolers is dietary iron deficiency, nonetheless there are other associated and unevaluated conditions. Objective: To estimate the prevalence of anemia and iron deficiency in children aged 6 to 59 months and the association with inflammation, overall overweight, food intake and maternal educational level. Methods: A national cross-sectional study was carried out, with determinations of hemoglobin, ferritin, transferrin receptors, C-reactive protein and alpha-1 acid glycoprotein. The nutritional status, diet and educational level of the mother were evaluated. Results: One thousand four hundred and seventeen children were studied. The prevalence of anemia was 22.5%, 35.6% of iron deficiency, and 13.3% of erythropoietic dysfunction. 37.6% of cases presented inflammation and 7.5% presented global overweight prevalence. Anemia was associated with iron deficiency OR = 2.07(1.45-2.97) and inflammation OR = 2.01(1.45-2.78). No associations were found between anemia and iron deficiency with overall overweight. Low consumption of eggs OR = 1.84 (95% CI 1.39-2.43), fruits OR = 1.73 (95% CI 1.29-2.34) and legumes OR = 1.68 (CI 95% 1.25-2.25) were found to be a risk factor for anemia. The logistic regression analysis showed that anemia was associated with the group under two years of age. Conclusions: Anemia and iron deficiency classify as moderate public health problems associated with inflammation. The group under two years of age and low fruit consumption turned out to be a risk factor and overall overweight turned out to be a protective factor for anemia.

Prevalence of Anemia and Iron Deficiency in Women of Reproductive Age in Cuba and Associated Factors.

This study aims to evaluate the prevalence of anemia and iron deficiency in women of reproductive age and the association with inflammation, global overweight, adiposity, and menorrhagia. A sample design of women of reproductive age from the Eastern, Central, and Havana Regions was carried out. Biochemical determinations of hemoglobin, serum ferritin, soluble transferrin receptors, leukocytes, C-reactive protein, alpha-1 acid glycoprotein, and homocysteine were performed. Serum ferritin was also adjusted by inflammation. Nutritional status was assessed, and menstrual characteristics were collected by survey. A total of 742 women were studied. The prevalence of anemia was 21.4%, iron storage deficiency at 16.0%, and erythropoietic dysfunction at 5.4%, with inflammation at 47.0% and elevated homocysteine at 18.6%. Global overweight was 46.2% and increased adiposity at 58.4%. Anemia is associated with iron deposition deficiency (OR = 3.023 (1.816-5.033)) and with erythropoietic deficiency (OR = 5.62 (3.03-10.39)), but not with inflammation, global overweight, and adiposity. Global overweight was found to be associated with inflammation (OR = 2.23 (1.41-3.53)). Anemia was associated with heavy menstrual bleeding (OR = 1.92 (1.34-2.76)). Homocysteine was associated with inflammation (OR = 2.05 (1.08-3.90)), but not with anemia. In conclusion, anemia in Cuba is classified as a moderate public health problem, but not iron deficiency. A high prevalence of overweight and obesity was found, associated with inflammation, but not with anemia or iron deficiency. Heavy menstrual bleeding is a factor associated with anemia.

Adjusting Iron Deficiency for Inflammation in Cuban Children Aged Under Five Years: New Approaches Using Quadratic and Quantile Regression.

INTRODUCTION: Ferritin is the best biomarker for assessing iron deficiency, but ferritin concentrations increase with inflammation. Several adjustment methods have been proposed to account for inflammation's effect on iron biomarker interpretation. The most recent and highly recommended method uses linear regression models, but more research is needed on other models that may better define iron status in children, particularly when distributions are heterogenous and in contexts where the effect of inflammation on ferritin is not linear. OBJECTIVE: Assess the utility and relevance of quadratic regression models and quantile quadratic regression models in adjusting ferritin concentration in the presence of inflammation. METHODS: We used data from children aged under five years, taken from Cuba's national anemia and iron deficiency survey, which was carried out from 2015-2018 by the National Hygiene, Epidemiology and Microbiology Institute. We included data from 1375 children aged 6 to 59 months and collected ferritin concentrations and two biomarkers for inflammation: C-reactive protein and α-1 acid glycoprotein. Quadratic regression and quantile regression models were used to adjust for changes in ferritin concentration in the presence of inflammation. RESULTS: Unadjusted iron deficiency prevalence was 23% (316/1375). Inflammation-adjusted ferritin values increased iron-deficiency prevalence by 2.6-4.5 percentage points when quadratic regression correction model was used, and by 2.8-6.2 when quantile regression was used. The increase when using the quantile regression correction model was more pronounced and statistically significant when both inflammation biomarkers were considered, but adjusted prevalence was similar between the two correction methods when only one biomarker was analyzed. CONCLUSIONS: The use of quadratic regression and quantile quadratic regression models is a complementary strategy in adjusting ferritin for inflammation, and is preferable to standard regression analysis when the linear model's basic assumptions are not met, or when it can be assumed that ferritin-inflammation relationships within a subpopulation may deviate from average trends.

Influence of Inflammation on Assessing Iron-Deficiency Anemia in Cuban Preschool Children.

INTRODUCTION: Anemia is a public health problem worldwide and is most prevalent in preschool children, for whom it is the most frequent cause of nutritional deficits. In turn, iron deficiency is the main cause of anemia, affecting 43% of children globally. Previous studies in Cuba show rates of iron deficiency in preschool children between 38.6% and 57.6%, higher in infants (71.2% to 81.1%). WHO recommends using serum ferritin as an indicator of iron deficiency accompanied by acute (C-reactive protein) and chronic (a1-acid glycoprotein) inflammation biomarkers. OBJECTIVE: Assess how inflammation affects measuring and reporting of iron-deficiency anemia rates in Cuban preschool children. METHODS: Data were obtained from serum samples contained in the National Anemia and Iron Deficiency Survey, and included presumably healthy preschool Cuban children (aged 6-59 months). Serum samples were collected from 1375 children from randomly selected provinces in 4 regions of the country from 2014 through 2018. We examined the association between ferritin and two inflammatory biomarkers: C-reactive protein and a1-acid glycoprotein. Individual inflammation-adjusted ferritin concentrations were calculated using four approaches: 1) a higher ferritin cut-off point (⟨30 g/L); 2) exclusion of subjects showing inflammation (C-reactive protein ⟩5 mg/L or a1-acid glycoprotein ⟩1 g/L); 3) mathematical correction factor based on C-reactive protein or a1-acid glycoprotein; and 4) correction by regression with the method proposed by the Biomarkers Reflecting Inflammation and Nutritional Determinants of Anemia Group. We estimated confidence intervals of differences between unadjusted prevalence and prevalence adjusted for inflammation by each method. RESULTS: The proportion of children with inflammation according to C-reactive protein concentrations >5 mg/L was lower (11.1%, 153/1375) than the proportion measured according to the concentrations of a1-acid glycoprotein, at >1 g/L (30.8%, 424/1375). The percentage of children with high concentrations of at least one of the aforementioned biomarkers was 32.7% (450/1375). Thus, each correction method increased the observed prevalence of iron deficiency compared to unadjusted estimates (23%, 316/1375). This increase was more pronounced when using the internal regression correction method (based only on C-reactive protein) or the method based on a higher cut-off point. Adjustment using all four methods changed estimated iron deficiency prevalence, increasing it from 0.1% to 8.8%, compared to unadjusted values. CONCLUSIONS: One-third of preschool children had biomarkers indicating elevated inflammation levels. Without adjusting for inflammation, iron deficiency prevalence was underestimated. The significant disparity between unadjusted and inflammation-adjusted ferritin when using some approaches highlights the importance of selecting the right approach for accurate, corrected measurement. The internal regression correction approach is appropriate for epidemiological studies because it takes into account inflammation severity. However, other models should be explored that account for inflammation and also provide better adjusted ferritin concentrations.

Deficiencia de cinc en mujeres en edad reproductiva, La Habana, Cuba / Zinc deficiency in childbearing-aged women, Havana, Cuba

Introducción: La deficiencia de cinc se considera un problema de salud global. Existe escasa información sobre el estado nutricional del cinc en mujeres cubanas en edad reproductiva. Objetivo: Identificar deficiencia de cinc y cobre sérico en mujeres en edad reproductiva, según factores relacionados, como la anemia, inflamación, exceso de peso y adiposidad abdominal. Métodos: Se estudiaron 104 mujeres de 18 a 40 años de edad, de La Habana, aparentemente sanas. Se realizó un estudio transversal descriptivo. Se realizó la determinación de cinc, cobre, hemoglobina, ferritina, proteína C reactiva, alfa 1 glicoproteína, peso, talla y circunferencia mínima de la cintura, se calculó el índice de masa corporal. Se utilizaron puntos de corte internacionales para la evaluación. Resultados: La prevalencia de deficiencia de hierro, estimada por ferritina sérica, cinc y cobre sérico fueron 66,3 por ciento (67/102), 36,2 por ciento (34/94) y 19,1 por ciento (18/94), respectivamente. De las mujeres 23,5 por ciento (24/102) tenían anemia e inflamación 8,8 por ciento (9/102) y 13 por ciento (13/102) estimada por CRP y AGP. Predominaron mujeres con exceso de peso 52,9 por ciento (54/102) y adiposidad abdominal 61,8 por ciento (60/97). Conclusiones: El riesgo de deficiencia de cinc en la muestra es elevado, la prevalencia del Zn sérico disminuido supera el 20 por ciento. No existe criterio para evaluar el riesgo de deficiencia de cobre como problema de salud pública. Las deficiencias de cinc y cobre no parecen estar asociadas a la anemia, la inflamación y el estado nutricional general. Se requiere realizar pesquisas adicionales para identificar la magnitud de las deficiencias de cinc y cobre y sus posibles causas(AU)

Introduction: Zinc deficiency is considered a global health problem. There is scarce information on zinc's nutritional state in Cuban childbearing-aged women. Objective: Identify zinc and serum copper deficiency in childbearing-aged women, based on related factors, such as anemia, inflammation, excess weight and abdominal adiposity. Methods: 104 seemingly healthy women from Havana, aged 18 to 40 were studied. A descriptive cross-sectional study was conducted. The determination of zinc, copper, hemoglobin, ferritin, C-reactive protein, alpha 1 glycoprotein, weight, size and minimum waist circumference was made, and the body mass index was calculated. International breakpoints were used for evaluation. Results: The prevalence of iron deficiency, estimated by serum ferritin, zinc and serum copper was 66.3 percent (67/101), 36.2 percent (34/94) and 19.1 percent (18/94), respectively. Of women, 23.5 percent (24/102) had anemia, and 8.8 percent had inflammation (9/102) and 13 percent (13/100) estimated by CRP and AGP. Women with overweight 52.9 percent (54/102) and abdominal adiposity 61.8% (60/97) predominated. Conclusions: The risk of zinc deficiency in the sample is high, the prevalence of decreased serum Zn exceeds 20 percent. There is no criterion for assessing the risk of copper deficiency as a public health problem. Zinc and copper deficiencies do not appear to be associated with anemia, inflammation and overall nutritional status. Additional tests are required to identify the magnitude of zinc and copper deficiencies and their possible causes(AU)

Intervención nutricional participativa en adolescentes de enseñanza media del municipio Habana Vieja / Participative nutritional intervention in middle school adolescents from Habana Vieja municipality

Introducción: Los hábitos alimentarios no saludables potencian las enfermedades crónicas que constituyen las primeras causas de muerte en Cuba. Objetivos: Evaluar los efectos de una intervención nutricional sobre los cambios en los conocimientos de alimentación-nutrición y hábitos alimentarios en adolescentes. Métodos: Se realizó una intervención nutricional participativa con adolescentes de 12-15 años del municipio Habana Vieja, durante sus tres años curriculares. De los 604 adolescentes que comenzaron el estudio 155 formaron los grupos promotores que lideraron las actividades realizadas. Se aplicaron encuestas de conocimientos, consumo y hábitos alimentarios antes y después de la intervención. Para comparar la puntuación alcanzada se utilizó la prueba t de Student para muestras pareadas. Para la comparación entre escuelas se utilizó análisis de la varianza simple y para comparar los porcentajes de respuestas correctas de las preguntas de conocimientos, consumo de hortalizas y azúcar antes y después de la prueba de estimación de diferencias entre proporciones. Se definió como umbral de significación estadística p < 0,05. Resultados: Los grupos promotores mostraron aumentos significativos de los conocimientos (p < 0,001). Se encontraron diferencias entre escuelas para los grupos promotores (p < 0,001) y para el resto de los estudiantes (p = 0,024). Decreció el azúcar añadido a los refrescos para los grupos promotores (p < 0,001) y a la leche para todos los adolescentes (p = 0,002). No hubo cambios en el hábito de desayunar, en el gusto por alimentos fritos, ni en el consumo de refrescos, frituras, dulces y pizzas. Conclusiones: Las intervenciones de educación nutricional son necesarias para alcanzar patrones dietéticos más saludables y de esta manera contribuir a detener la epidemia de enfermedades no transmisibles, además permiten que los adolescentes tengan un acercamiento al tema alimentación-nutrición(AU)

Introduction: Non-healthy food habits boost chronic diseases that represent the main death causes in Cuba. Objectives: To assess the effects of a nutritional intervention on the changes in the knowledge of diet-nutrition and food habits of adolescents. Methods: It was carried out a participative nutritional intervention with adolescents from 12 to 15 years from Habana Vieja municipality during their 3 middle school years. From 604 adolescents that started the study, 155 formed the promoter groups which leadered the activities implemented. There were applied knowledge surveys on food consumption and habits before and after the intervention. For comparing the scores, it was used t-Student test for paired samples. It was used the analysis of simple variance for comparing among schools and the percentages of right answers in the knowledge questions, intake of vegetables and sugar before and after of the test for the estimation of differences among proportions. It was defined p<0,05 as the threshold of statistical signification. Results: The promoter groups showed significative increase of knowledge (p<0,001). There were found differences among schools for promoter groups (p<0,001) and for the rest of the students (p<0,024). In the promoter groups decreased the intake of sugar added to soft drinks (p<0,001) and to milk for all the adolescents studied (p<0,002). There were no changes in breakfast habits, liking fried food, or the consumption of soft drinks, fritters, sweets and pizzas. Conclusions: Nutritional education interventions are needed to reach healthier diet patterns and in this way contributing to stop the epidemic of non-communicable diseases; in addition, they allow adolescents to have an approach to food-nutrition topic(AU)