<?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>0036-3634</journal-id>
<journal-title><![CDATA[Salud Pública de México]]></journal-title>
<abbrev-journal-title><![CDATA[Salud pública Méx]]></abbrev-journal-title>
<issn>0036-3634</issn>
<publisher>
<publisher-name><![CDATA[Instituto Nacional de Salud Pública]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S0036-36342017000500566</article-id>
<article-id pub-id-type="doi">10.21149/8481</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Anticoncepción en adolescentes mexicanos de escuelas del nivel medio superior: uso y necesidades insatisfechas]]></article-title>
<article-title xml:lang="en"><![CDATA[Contraception in Mexican adolescents in upper secondary schools: use and unmet needs]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Villalobos]]></surname>
<given-names><![CDATA[Aremis]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Castro]]></surname>
<given-names><![CDATA[Filipa de]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Rojas]]></surname>
<given-names><![CDATA[Rosalba]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Allen]]></surname>
<given-names><![CDATA[Betania]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Instituto Nacional de Salud Pública Centro de Investigación en Salud Poblacional Dirección de Salud Reproductiva]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>Mexico</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>10</month>
<year>2017</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>10</month>
<year>2017</year>
</pub-date>
<volume>59</volume>
<numero>5</numero>
<fpage>566</fpage>
<lpage>576</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S0036-36342017000500566&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S0036-36342017000500566&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S0036-36342017000500566&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen:  Objetivo:  Describir el comportamiento sexual y el uso de anticonceptivos en adolescentes escolarizados.  Material y métodos:  Encuesta representativa nacional en escuelas de educación media superior en México, realizada en 2014. Modelos logísticos identifican factores asociados al uso de anticonceptivos y a necesidades insatisfechas de anticoncepción (NIA).  Resultados:  Entre los hombres, no emplear anticonceptivos en la última relación sexual se asocia con la no utilización de éstos durante el debut sexual (RM=11.5; IC95% 5.6-23.4) y desconocer anticonceptivos efectivos (RM=2.4; IC95% 1.04-5.5). Entre las mujeres, no emplear anticonceptivos se asocia con el no uso de éstos durante el debut sexual (RM=4.5; IC95% 2.3-8.4) y la falta de autoeficacia en el uso/negociación del condón (RM=3.1; IC95% 1.18.2). Las NIA se asocian con baja autoeficacia respecto al uso/negociación del condón (RM=3.5; IC95% 1.3-9.4), no usar anticonceptivos en el debut sexual (RM=9.0; IC95% 2.5-32.4) y usar alcohol o drogas en relaciones sexuales (RM=3.0; IC95% 1.1-8.1).  Conclusiones:  Se requieren estrategias que garanticen el uso de anticonceptivos desde el debut sexual y que promuevan la autoeficacia y las prácticas seguras entre los adolescentes.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstrac:  Objective:  To describe sexual behavior and contraceptive use in adolescent students.  Materials and methods:  National representative survey in upper secondary schools in Mexico 2014. Logistic regressions identify the factors associated with contraceptive use and unmet needs for contraception (UNC).  Results:  For male adolescents, non-contraceptive use in the last sexual relation is associated with non-contraceptive use in the sexual debut (OR=11.5; IC95%:5.6,23.4) and not recognizing effective contraceptive methods (OR=2.4;IC95%:1.04,5.5). For female adolescents, non-contraceptive use is associated with non-contraceptive use in sexual debut (OR=4.5;IC95%:2.3,8.4) and low self-efficacy towards condom use and negotiation (OR=3.1; IC95%:1.1,8.2). UNC were associated with insecure attitudes towards condom use and negotiation (OR=3.5;IC95%:1.3,9.4), non-contraceptive use in sexual debut (OR=9.0;IC95%:2.5,32.4) and use of alcohol or drugs during sexual relations (OR=3.0;IC95%:1.1,8.1).  Conclusions:  Strategies to ensure contraceptive use from sexual debut onwards are required, promoting self-efficacy and safe sex practices among adolescents.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[anticoncepción]]></kwd>
<kwd lng="es"><![CDATA[adolescente]]></kwd>
<kwd lng="es"><![CDATA[salud reproductiva]]></kwd>
<kwd lng="en"><![CDATA[contraception]]></kwd>
<kwd lng="en"><![CDATA[adolescent]]></kwd>
<kwd lng="en"><![CDATA[reproductive health]]></kwd>
</kwd-group>
</article-meta>
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