<?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>0300-9041</journal-id>
<journal-title><![CDATA[Ginecología y obstetricia de México]]></journal-title>
<abbrev-journal-title><![CDATA[Ginecol. obstet. Méx.]]></abbrev-journal-title>
<issn>0300-9041</issn>
<publisher>
<publisher-name><![CDATA[Federación Mexicana de Colegios de Obstetricia y Ginecología A.C.]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S0300-90412024000900359</article-id>
<article-id pub-id-type="doi">10.24245/gom.v92i9.9870</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Tendencia secular de la menarquia en la población mexicana]]></article-title>
<article-title xml:lang="en"><![CDATA[Secular changes in onset of menarche among Mexican women.]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Robellada Zárate]]></surname>
<given-names><![CDATA[Claudia Melina]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Zapata Caballero]]></surname>
<given-names><![CDATA[Carlos Agustín]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Morales Hernández]]></surname>
<given-names><![CDATA[Fela Vanessa]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Flores Robles]]></surname>
<given-names><![CDATA[Claudia Monserrat]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Roque Sánchez]]></surname>
<given-names><![CDATA[Armando Miguel]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Kably Ambe]]></surname>
<given-names><![CDATA[Alberto]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Hospital Ángeles Lomas  ]]></institution>
<addr-line><![CDATA[Huixquilucan Estado de México]]></addr-line>
</aff>
<aff id="Af2">
<institution><![CDATA[,Instituto Nacional de Perinatología Isidro Espinosa de los Reyes  ]]></institution>
<addr-line><![CDATA[Ciudad de México ]]></addr-line>
</aff>
<aff id="Af3">
<institution><![CDATA[,Instituto Nacional de Perinatología Isidro Espinosa de los Reyes  ]]></institution>
<addr-line><![CDATA[Ciudad de México ]]></addr-line>
</aff>
<aff id="Af4">
<institution><![CDATA[,Instituto Nacional de Perinatología Isidro Espinosa de los Reyes  ]]></institution>
<addr-line><![CDATA[Ciudad de México ]]></addr-line>
</aff>
<aff id="Af5">
<institution><![CDATA[,Hospital Ángeles Lomas  ]]></institution>
<addr-line><![CDATA[Huixquilucan Estado de México]]></addr-line>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>00</month>
<year>2024</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>00</month>
<year>2024</year>
</pub-date>
<volume>92</volume>
<numero>9</numero>
<fpage>359</fpage>
<lpage>363</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S0300-90412024000900359&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S0300-90412024000900359&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S0300-90412024000900359&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen  OBJETIVO: Determinar si la edad al inicio de la menarquia en mujeres mexicanas ha disminuido a lo largo de las décadas.  MATERIALES Y MÉTODOS: Estudio observacional, retrospectivo y multicéntrico efectuado en pacientes atendidas entre 1977-2021 en el Instituto Nacional de Perinatología Isidro Espinosa de los Reyes y 2022-2023 en el Centro Especializado para la Atención de la Mujer. Para fines de estudio las participantes se dividieron en cinco grupos según la década de nacimiento A: 1920-1969, B: 1970-1979, C: 1980-1989, D: 1990-1999, E: 2000-2009. Para evaluar las diferencias en la tendencia de la edad a la menarquia se hizo un análisis de regresión lineal simple mediante ANOVA. Se consideró significativo el valor de p &lt; 0.05.  RESULTADOS: En el análisis final se incluyeron 20,715 pacientes. La edad media global de inicio de la menarquia fue de 12.0 años ± 1.62. Al hacer la comparación entre grupos se observó una diferencia estadísticamente significativa entre la edad media a la menarquia entre los grupos de décadas p = 0.0001. En la regresión lineal se observó una tendencia estadísticamente significativa a la disminución de la edad para el inicio de la menarquia conforme pasan las décadas.  CONCLUSIONES: Se encontró una disminución significativa en la edad para el inicio de la menarquia a lo largo de las décadas de 1.35 meses por cada década transcurrida. Este cambio podría tener diversas implicaciones en la salud pública y la atención médica ginecológica. Los resultados resaltan la necesidad de emprender estudios futuros que investiguen las causas específicas de esta tendencia y sus posibles consecuencias a largo plazo.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract  OBJECTIVE: To determine whether the age at menarche in Mexican women has decreased over the decades.  MATERIALS AND METHODS: Observational, retrospective, multicenter study conducted on patients seen between 1977-2021 at the Instituto Nacional de Perinatología Isidro Espinosa de los Reyes and 2022-2023 at the Centro Especializado para la Atención de la Mujer. For the purposes of the study, the participants were divided into five groups according to the decade of their birth A: 1920-1969, B: 1970-1979, C: 1980-1989, D: 1990-1999, E: 2000-2009. A simple linear regression analysis using ANOVA was performed to evaluate differences in the trend of age at menarche. A value of p &lt; 0.05 was considered significant.  RESULTS: A total of 20,715 patients were included in the final analysis. The overall mean age at onset of menarche was 12.0 years ± 1.62. There was a statistically significant difference in mean age at menarche between the decade groups p = 0.0001. In linear regression, a statistically significant trend of decreasing age at onset of menarche was observed with increasing decade.  CONCLUSIONS: We found a significant decrease in age at menarche over the decades of 1.35 months for each decade elapsed. This change may have several implications for public health and gynecological care. The results highlight the need for future studies to investigate the specific causes of this trend and its possible long-term consequences.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[Menarquia]]></kwd>
<kwd lng="es"><![CDATA[edad al inicio]]></kwd>
<kwd lng="es"><![CDATA[mujer]]></kwd>
<kwd lng="es"><![CDATA[niña]]></kwd>
<kwd lng="es"><![CDATA[modelos lineales]]></kwd>
<kwd lng="es"><![CDATA[salud pública]]></kwd>
<kwd lng="es"><![CDATA[desarrollo sexual]]></kwd>
<kwd lng="en"><![CDATA[Menarche]]></kwd>
<kwd lng="en"><![CDATA[Age at onset]]></kwd>
<kwd lng="en"><![CDATA[Women has]]></kwd>
<kwd lng="en"><![CDATA[Child]]></kwd>
<kwd lng="en"><![CDATA[Linear models]]></kwd>
<kwd lng="en"><![CDATA[Public Health]]></kwd>
<kwd lng="en"><![CDATA[Sexual development]]></kwd>
</kwd-group>
</article-meta>
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