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      Prevalence of anaemia, risk of haemoconcentration and risk factors during the three trimesters of pregnancy Translated title: Prevalencia de anemia y riesgo de hemoconcentración durante los 3 trimestres de embarazo y factores de riesgo

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          Abstract

          Abstract Objective: To evaluate the prevalence of anaemia and the risk of haemoconcentration and its risk factors during all 3 trimesters of pregnancy in women in a Mediterranean area in the south of Europe. Material and methods: Longitudinal study of 11,259 women whose pregnancies were monitored at primary care centres between 2007 and 2012. The computerised clinical histories of all the pregnancies were used to collect haemoglobin (Hb) data for each trimester. The histories also provided information on the age of the mother, her socioeconomic status, the presence of obesity, tobacco use, type of pregnancy, and number of previous pregnancies and births. Anaemia was defined as Hb < 110 g/L in the 1st and 3rd trimesters of pregnancy and Hb < 105 g/L in the second. The risk of haemoconcentration was defined as Hb > 130 g/L in the 2nd and 3rd trimesters of pregnancy. Results: The prevalence of anaemia increased from 3.8% in the first trimester to 21.5% in the 3rd trimester. Around 10% of the women had Hb > 130 g/L during the 3rd trimester. Having children previously and/or being younger than 20 increased the chances of anaemia (Adj. OR: 1.4; 95% CI: 1.1-1.9), but being older than 34 increased the chances of Hb > 130 g/L (Adj. OR: 1.3; 95% CI: 1.1-1.5). Conclusion: The increased prevalence of anaemia is a moderate public health problem. Understanding the factors that influence these problems may help improve the guidelines regarding the use of iron supplements.

          Translated abstract

          Resumen Objetivo: valorar la prevalencia de anemia y de riesgo de hemoconcentración y sus factores de riesgo durante los 3 trimestres de embarazo en las mujeres de una zona mediterránea del sur de Europa. Material y métodos: estudio longitudinal con 11.259 mujeres que realizaron el seguimiento de su embarazo en centros de atención primaria entre el 2007 y 2012. A partir de la historia clínica informatizada se recogieron datos de hemoglobina (Hb) de cada trimestre de gestación, edad de la madre, bajo nivel socioeconómico, presencia de obesidad, hábito tabáquico, tipo de embarazo, número de embarazos y partos previos. Se definió anemia como Hb < 110 g/L para el 1er y 3er trimestre de gestación y como Hb < 105 g/L para el 2º trimestre. Se definió riesgo de hemoconcentración a Hb > 130 g/L en el 2º y 3er trimestre. Resultados: la prevalencia de anemia aumentó del 3.8% en el primer trimestre al 21.5% en el 3er trimestre. Alrededor de un 10% de las mujeres tuvieron Hb > 130 g/L en el 3er trimestre. Tener hijos previos y/o ser menor de 20 años predispone a tener anemia (adj. OR: 1.4; 95% CI: 1.1-1.9), pero tener más de 34 años predispone a Hb > 130 g/L (adj. OR: 1.3; 95% CI: 1.1-1.5). Conclusión: la elevada prevalencia de anemia supone un problema moderado de salud pública. El conocimiento de los factores que pueden influir en dichas prevalencias puede ayudar a adaptar mejor la pauta de suplementación con hierro.

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          Global, regional, and national trends in haemoglobin concentration and prevalence of total and severe anaemia in children and pregnant and non-pregnant women for 1995–2011: a systematic analysis of population-representative data

          Summary Background Low haemoglobin concentrations and anaemia are important risk factors for the health and development of women and children. We estimated trends in the distributions of haemoglobin concentration and in the prevalence of anaemia and severe anaemia in young children and pregnant and non-pregnant women between 1995 and 2011. Methods We obtained data about haemoglobin and anaemia for children aged 6–59 months and women of childbearing age (15–49 years) from 257 population-representative data sources from 107 countries worldwide. We used health, nutrition, and household surveys; summary statistics from WHO's Vitamin and Mineral Nutrition Information System; and summary statistics reported by other national and international agencies. We used a Bayesian hierarchical mixture model to estimate haemoglobin distributions and systematically addressed missing data, non-linear time trends, and representativeness of data sources. We quantified the uncertainty of our estimates. Findings Global mean haemoglobin improved slightly between 1995 and 2011, from 125 g/L (95% credibility interval 123–126) to 126 g/L (124–128) in non-pregnant women, from 112 g/L (111–113) to 114 g/L (112–116) in pregnant women, and from 109 g/L (107–111) to 111 g/L (110–113) in children. Anaemia prevalence decreased from 33% (29–37) to 29% (24–35) in non-pregnant women, from 43% (39–47) to 38% (34–43) in pregnant women, and from 47% (43–51) to 43% (38–47) in children. These prevalences translated to 496 million (409–595 million) non-pregnant women, 32 million (28–36 million) pregnant women, and 273 million (242–304 million) children with anaemia in 2011. In 2011, concentrations of mean haemoglobin were lowest and anaemia prevalence was highest in south Asia and central and west Africa. Interpretation Children's and women's haemoglobin statuses improved in some regions where concentrations had been low in the 1990s, leading to a modest global increase in mean haemoglobin and a reduction in anaemia prevalence. Further improvements are needed in some regions, particularly south Asia and central and west Africa, to improve the health of women and children and achieve global targets for reducing anaemia. Funding Bill & Melinda Gates Foundation, Grand Challenges Canada, and the UK Medical Research Council.
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            Worldwide prevalence of anaemia, WHO Vitamin and Mineral Nutrition Information System, 1993-2005.

            To provide current global and regional estimates of anaemia prevalence and number of persons affected in the total population and by population subgroup. We used anaemia prevalence data from the WHO Vitamin and Mineral Nutrition Information System for 1993-2005 to generate anaemia prevalence estimates for countries with data representative at the national level or at the first administrative level that is below the national level. For countries without eligible data, we employed regression-based estimates, which used the UN Human Development Index (HDI) and other health indicators. We combined country estimates, weighted by their population, to estimate anaemia prevalence at the global level, by UN Regions and by category of human development. Survey data covered 48.8 % of the global population, 76.1 % of preschool-aged children, 69.0 % of pregnant women and 73.5 % of non-pregnant women. The estimated global anaemia prevalence is 24.8 % (95 % CI 22.9, 26.7 %), affecting 1.62 billion people (95 % CI 1.50, 1.74 billion). Estimated anaemia prevalence is 47.4 % (95 % CI 45.7, 49.1 %) in preschool-aged children, 41.8 % (95 % CI 39.9, 43.8 %) in pregnant women and 30.2 % (95 % CI 28.7, 31.6 %) in non-pregnant women. In numbers, 293 million (95 % CI 282, 303 million) preschool-aged children, 56 million (95 % CI 54, 59 million) pregnant women and 468 million (95 % CI 446, 491 million) non-pregnant women are affected. Anaemia affects one-quarter of the world's population and is concentrated in preschool-aged children and women, making it a global public health problem. Data on relative contributions of causal factors are lacking, however, which makes it difficult to effectively address the problem.
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              Iron status during pregnancy: setting the stage for mother and infant.

              Supplementation with iron is generally recommended during pregnancy to meet the iron needs of both mother and fetus. When detected early in pregnancy, iron deficiency anemia (IDA) is associated with a > 2-fold increase in the risk of preterm delivery. Maternal anemia when diagnosed before midpregnancy is also associated with an increased risk of preterm birth. Results of recent randomized clinical trials in the United States and in Nepal that involved early supplementation with iron showed some reduction in risk of low birth weight or preterm low birth weight, but not preterm delivery. During the 3rd trimester, maternal anemia usually is not associated with increased risk of adverse pregnancy outcomes and may be an indicator of an expanded maternal plasma volume. High levels of hemoglobin, hematocrit, and ferritin are associated with an increased risk of fetal growth restriction, preterm delivery, and preeclampsia. While iron supplementation increases maternal iron status and stores, factors that underlie adverse pregnancy outcome are considered to result in this association, not iron supplements. On the other hand, iron supplements and increased iron stores have recently been linked to maternal complications (eg, gestational diabetes) and increased oxidative stress during pregnancy. Consequently, while iron supplementation may improve pregnancy outcome when the mother is iron deficient it is also possible that prophylactic supplementation may increase risk when the mother does not have iron deficiency or IDA. Anemia and IDA are not synonymous, even among low-income minority women in their reproductive years.
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                Author and article information

                Journal
                nh
                Nutrición Hospitalaria
                Nutr. Hosp.
                Grupo Arán (Madrid, Madrid, Spain )
                0212-1611
                1699-5198
                February 2018
                : 35
                : 1
                : 123-130
                Affiliations
                [4] Reus, Tarragona orgnameUniversitat Rovira i Virgili orgdiv1Institut d'Investigació Sanitària Pere Virgili (IISPV) Spain
                [1] Tarragona orgnameUniversitat Rovira i Virgili orgdiv1Faculty of Medicine and Health Sciences Spain
                [2] orgnameInstitut Català de la Salut orgdiv1Servei d'Atenció a la Salut Sexual i Reproductiva (ASSIR) de Tarragona-Reus Spain
                [3] orgnameInstitut Català de la Salut. Catalunya orgdiv1Institut Universitari d'Investigació en Atenció Primària Jordi Gol (IDIAP Jordi Gol). Barcelona orgdiv2Unitat de Suport a la Recerca Tarragona-Reus Spain
                Article
                S0212-16112018000100123 S0212-1611(18)03500100123
                10.20960/nh.1045
                ac76f379-5e9c-49ad-a759-6b2bbefa4ab9

                This work is licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International License.

                History
                : 28 July 2017
                : 17 February 2017
                Page count
                Figures: 0, Tables: 0, Equations: 0, References: 26, Pages: 8
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                SciELO Spain

                Categories
                Original Papers

                Riesgo de hemoconcentración,Embarazo,Prevalence,Risk of haemoconcentration,Anaemia. Risk factors,Pregnancy,Anemia. Factores de riesgo,Prevalencia

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