<?xml version="1.0" encoding="ISO-8859-1"?><article xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
<front>
<journal-meta>
<journal-id>1665-1146</journal-id>
<journal-title><![CDATA[Boletín médico del Hospital Infantil de México]]></journal-title>
<abbrev-journal-title><![CDATA[Bol. Med. Hosp. Infant. Mex.]]></abbrev-journal-title>
<issn>1665-1146</issn>
<publisher>
<publisher-name><![CDATA[Instituto Nacional de Salud, Hospital Infantil de México Federico Gómez]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S1665-11462023000300183</article-id>
<article-id pub-id-type="doi">10.24875/bmhim.22000120</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[Role of gestational age and maternal biological factors in early term neonatal morbidity]]></article-title>
<article-title xml:lang="es"><![CDATA[Rol de la edad gestacional y factores biológicos maternos en la morbilidad del neonato a término temprano]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Alarcón Avila]]></surname>
<given-names><![CDATA[Claudia]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
<xref ref-type="aff" rid="Aaf"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Monsalve Montezuma]]></surname>
<given-names><![CDATA[Juanita]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Guarin Molano]]></surname>
<given-names><![CDATA[David]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Pirabán Gálvez]]></surname>
<given-names><![CDATA[Natalia]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Alonso Rico]]></surname>
<given-names><![CDATA[Laura]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Osorio Beltran]]></surname>
<given-names><![CDATA[Daniela]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Rodríguez Grande]]></surname>
<given-names><![CDATA[Eliana]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
<xref ref-type="aff" rid="Aaf"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Universidad Militar Nueva Granada  ]]></institution>
<addr-line><![CDATA[Bogotá ]]></addr-line>
<country>Colombia</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Hospital Militar Central  ]]></institution>
<addr-line><![CDATA[Bogotá ]]></addr-line>
<country>Colombia</country>
</aff>
<aff id="Af3">
<institution><![CDATA[,Universidad del Rosario  ]]></institution>
<addr-line><![CDATA[Bogotá ]]></addr-line>
<country>Colombia</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>06</month>
<year>2023</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>06</month>
<year>2023</year>
</pub-date>
<volume>80</volume>
<numero>3</numero>
<fpage>183</fpage>
<lpage>188</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S1665-11462023000300183&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S1665-11462023000300183&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S1665-11462023000300183&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract  Background: The morbidity of early-term newborns (ETNBs) is associated with the immaturity of their organs and maternal biological factors (MBF). In this study, we determined the relationship between MBF and early-term birth. In addition, we assessed the role of gestational age (GA) and MBF in the morbidity of ETNBs compared with full-term newborns (FTNBs).  Methods: This retrospective cohort included ETNBs and FTNBs. The frequency of morbidities was compared between groups stratified by GA with the X2 test or Fisher&#8217;s exact test. The association of MBF with GA and morbidity was calculated using binomial regression models between the variables that correlated with the morbidity of the ETNBs using Spearman&#8217;s correlation. A significance level of 5% was estimated for all analyses.  Results: The probability of morbidity at birth for ETNBs was 1.9-fold higher than for FTNBs (37.5% vs. 19.9%), as they required more admission to the neonatal unit and more days of hospitalization; the most frequent pathology was jaundice. The MBF associated with early term birth were hypertensive disorders of pregnancy (aRR = 1.4, 95% confidence interval (CI): 1.3&#8211;1.6), intrauterine growth restriction (aRR = 1.5, 95% CI: 1.3&#8211;1.6), and chronic hypertension (aRR = 1.6, 95% CI: 1.4&#8211;1.8). No association was found between MBF and morbidity at 37 and 38 weeks.  Conclusions: The morbidity among ETNBs is related to physiological immaturity. The adverse MBF favor a hostile intrauterine environment, which affects fetal and neonatal well-being.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen  Introducción: La morbilidad de los recién nacidos a término temprano (RNTT) se asocia con la inmadurez de sus órganos y factores biológicos maternos (FBM). En este estudio se determinó la relación entre FBM y el nacimiento a término temprano. Además, se evaluó el papel de la edad gestacional (EG) y los FBM en la morbilidad de los RNTT comparados con los recién nacidos a término completo (RNTC).  Métodos: Este estudio de cohorte retrospectivo incluyó RNTT y RNTC. La frecuencia de morbilidades se comparó entre grupos estratificados por EG con la prueba de X2 o la prueba exacta de Fisher. La asociación de FBM con EG y morbilidad se calculó mediante modelos de regresión binomial entre variables correlacionadas con morbilidad de ETNB mediante la correlación de Spearman. Se estimó un nivel de significación del 5% para todos los análisis.  Resultados: Los RNTT presentaron una probabilidad 1.9 veces mayor de morbilidad al nacer comparado con los RNTC (37.5% vs 19.9%), ya que requirieron mayor admisión a la unidad neonatal y más días de hospitalización; la patología más frecuente fue la ictericia. Los FBM asociados con el nacimiento a término temprano fueron los: trastornos hipertensivos gestacionales, restricción del crecimiento intrauterino e hipertensión crónica. No se encontró asociación entre factores biológicos maternos y la morbilidad a las 37 y 38 semanas.  Conclusiones: La morbilidad del RNTT se relaciona con la inmadurez fisiológica. Los FBM adversos favorecen un medio intrauterino hostil afectando el bienestar fetal y neonatal.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[Newborn]]></kwd>
<kwd lng="en"><![CDATA[Morbidity]]></kwd>
<kwd lng="en"><![CDATA[Biological factors]]></kwd>
<kwd lng="en"><![CDATA[Gestational age]]></kwd>
<kwd lng="es"><![CDATA[Recién nacido]]></kwd>
<kwd lng="es"><![CDATA[Morbilidad]]></kwd>
<kwd lng="es"><![CDATA[Factores biológicos]]></kwd>
<kwd lng="es"><![CDATA[Edad gestacional]]></kwd>
</kwd-group>
</article-meta>
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