referencias poblacionales argentinas de peso al nacer según multiplicidad del parto, sexo y edad gestacional reference birthweights for the argentine population by multiplicity of birth, sex, and gestational age

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ID: 142853
2011
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Abstract
OBJETIVO: Desarrollar referencias nuevas y mejoradas de peso al nacer según la edad gestacional (EG), el sexo y la multiplicidad del parto, para la población argentina en su conjunto. MÉTODOS: La población de estudio incluyó a todos los nacidos vivos de partos simples (n = 3 478 286) y dobles (n = 57 654) en Argentina durante el período 2003-2007. Los probables errores en la clasificación de la EG basada en la fecha de la última menstruación fueron corregidos con el uso de modelos de distribuciones normales mixtas. Los percentiles se obtuvieron mediante la regresión de cuantiles, que además posibilitó el suavizamiento de las curvas. RESULTADOS: Se obtuvieron curvas de peso al nacer para partos simples entre las semanas 22 y 43 de gestación y para partos dobles entre las semanas 24 y 41, según el sexo del neonato. Comparadas con estudios previos, estas referencias no sobreestiman la proporción de nacidos vivos grandes para su EG. Se observó también un aumento del peso al nacer a lo largo del período de estudio. CONCLUSIONES: Las curvas propuestas tienen las ventajas de basarse en grandes números, de ser representativas de los nacimientos argentinos más recientes, de distinguir el tipo de parto y el sexo de los neonatos, y de minimizar los errores de clasificación de la EG. Constituyen por lo tanto una herramienta útil para medir desigualdades y así identificar grupos poblacionales con mayor riesgo de eventos perinatales adversos.
OBJECTIVE: To develop new and improved reference birthweights for the Argentine population as a whole with a breakdown by gestational age (GA), sex and multiplicity of birth. METHODS: The population studied included all live births resulting from single (n = 3,478,286) and double (n = 57,654) births in Argentina during the period 2003- 2007. The probable errors in classifying GA on the basis of last menstruation were corrected using normal mixture models. The percentiles were obtained by quantile regression, which also made it possible to smooth out the curves. RESULTS: Birthweight curves for single births were obtained between weeks 22 and 43 of gestation, and curves for double births between weeks 24 and 41, with a breakdown by the sex of the neonate. Compared with those of previous studies, these reference birthweights do not overestimate the proportion of live births large for their GA. An increase in birthweight was also observed during the period of study. CONCLUSIONS: The proposed curves have the advantages of being based on large numbers, of being representative of the most recent Argentine births, of distinguishing the number of births and the sex of the neonates, and of minimizing GA classification errors. They are therefore a useful tool for measuring inequalities and thus identifying population groups at higher risk of adverse perinatal events.
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Authors ;Marcelo Luis Urquia;Marcio Alazraqui;Hugo Guillermo Spinelli;John William Frank
Journal communications on pure and applied analysis
Year 2011
DOI
DOI not found
URL
http://www.scielosp.org/scielo.php?script=sci_arttext&pid=S1020-49892011000200006
Keywords
pregnancy argentina infant reference standards gestational age birthweight recién nacido newborn multiple tropical medicinepublic aspects of medicine argentinamedicinearctic medicine

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