<?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>0120-4157</journal-id>
<journal-title><![CDATA[Biomédica]]></journal-title>
<abbrev-journal-title><![CDATA[Biomédica]]></abbrev-journal-title>
<issn>0120-4157</issn>
<publisher>
<publisher-name><![CDATA[Instituto Nacional de Salud]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S0120-41572017000300308</article-id>
<article-id pub-id-type="doi">10.7705/biomedica.v34i2.3240</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Validez de constructo y consistencia interna de tres estructuras factoriales y dos sistemas de puntuación del cuestionario de salud general de 12 ítems]]></article-title>
<article-title xml:lang="en"><![CDATA[Construct validity and internal consistency of three factor structures and two scoring methods of the 12-item General Health Questionnaire]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Simancas-Pallares]]></surname>
<given-names><![CDATA[Miguel]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Arrieta]]></surname>
<given-names><![CDATA[Katherine Margarita]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Arévalo]]></surname>
<given-names><![CDATA[Luisa Leonor]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Universidad de Cartagena Facultad de Odontología Departamento de Investigación]]></institution>
<addr-line><![CDATA[ Cartagena de Indias]]></addr-line>
<country>Colombia</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Universidad de Cartagena Facultad de Odontología Departamento de Odontología Preventiva y Social]]></institution>
<addr-line><![CDATA[ Cartagena de Indias]]></addr-line>
<country>Colombia</country>
</aff>
<aff id="Af3">
<institution><![CDATA[,Universidad de Cartagena Facultad de Odontología Departamento de Medicina Oral y Cirugía]]></institution>
<addr-line><![CDATA[ Cartagena de Indias]]></addr-line>
<country>Colombia</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>09</month>
<year>2017</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>09</month>
<year>2017</year>
</pub-date>
<volume>37</volume>
<numero>3</numero>
<fpage>308</fpage>
<lpage>314</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_arttext&amp;pid=S0120-41572017000300308&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_abstract&amp;pid=S0120-41572017000300308&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_pdf&amp;pid=S0120-41572017000300308&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen  Introducción: El análisis de las propiedades psicométricas de un instrumento reviste importancia para el control de sesgos en la medición.  Objetivo: Comparar la validez de constructo y la consistencia interna de tres estructuras factoriales del cuestionario de salud general de 12 ítems.  Materiales y métodos: Se hizo un estudio de validación en una muestra anidada de 483 estudiantes de odontología de Cartagena, Colombia. Además de las preguntas del instrumento, se hicieron otras sobre aspectos personales. Se evaluó la validez de constructo de la estructura unidimensional, de la unidimensional con corrección del sesgo de respuesta, y de la de dos y tres factores y sistemas de puntuación del tipo de la escala de Likert (0-1-2-3) y dicotómico (0-0-1-1). La validez se determinó con un análisis factorial confirmatorio y, la consistencia interna, con el coeficiente alfa de Cronbach para la escala de Likert y la fórmula 20 de Kuder-Richardson para el método dicotómico empleando los programas Stata(tm), versión 13.2 (Stata Corp, USA) y Mplus(tm), versión 7.11 (Muthen andMuthen, USA).  Resultados: Los índices de ajuste revelaron que el mejor modelo era el unidimensional con corrección del sesgo de respuesta y puntación dicotómica (grados de libertad=36; ji al cuadrado=52,432; raíz cuadrada del error medio de aproximación=0,03; IC90% 0,008-0,048; índice comparativo de ajuste=0,982; índice de Tucker-Lewis=0,966). La consistencia interna fue de 0,70.  Conclusiones: El ajuste del modelo obtenido en este estudio permitió controlar el sesgo de medición y, así, garantizar la validez externade los resultados del cuestionario de salud general de 12 ítems para la evaluación de las condiciones mentales en esta población. Las propiedades psicométricas de las escalas deben evaluarse críticamente antes del análisis de los resultados.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract  Introduction:  The analysis of the psychometric properties of an instrument is important for the control of measurement bias.  Objective: To compare the construct validity and internal consistency of three factorial structures of the General Health Questionnaire-12.  Materials and methods: We conducted a validation study in a nested sample of 483 dentistry students from Cartagena, Colombia. The instrument was applied along with questions about personal factors. The construct validity of the following structures was evaluated: one-dimensional, one-dimensional with correction of response bias, and the two and three-factor structure, and these scoring systems: Likert scale (0-1-2-3) and dichotomous (0-0-1-1) scoring method. Validity was determined by confirmatory factorial analysis, and the internal consistency with Cronbach's alpha coefficient for the Likert scale and the Kuder-Richardson Formula 20 for the dichotomous scoring using the Stata(tm), v. 13.2 (Stata Corp, USA) and Mplus(tm), v.7.11 (Muthen and Muthen, USA) software.  Results: Adjustment indexes revealed that the best model was the one-dimensional one with correction of response bias based on a dichotomous scoring (degrees of freedom=36; chi square=52.432; root mean square error of approximation=0.03; 90% CI: 0.008-0.048; comparative fit index=0.982; Tucker-Lewis index=0.966). The internal consistency was 0.70.  Conclusions: The adjustment of the model in this study allowed for the control of measurement bias and guaranteed external validity of results when using the General Health Questionnaire-12 to evaluate mental conditions in this population. The psychometric properties of the scales should be critically evaluated before results analysis.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[estudios de validación]]></kwd>
<kwd lng="es"><![CDATA[análisis factorial]]></kwd>
<kwd lng="es"><![CDATA[sesgo (epidemiología)]]></kwd>
<kwd lng="es"><![CDATA[psicometría]]></kwd>
<kwd lng="es"><![CDATA[salud mental]]></kwd>
<kwd lng="es"><![CDATA[estudiantes de odontología]]></kwd>
<kwd lng="en"><![CDATA[validation studies]]></kwd>
<kwd lng="en"><![CDATA[factor analysis, statistical]]></kwd>
<kwd lng="en"><![CDATA[bias (epidemiology)]]></kwd>
<kwd lng="en"><![CDATA[psychometrics]]></kwd>
<kwd lng="en"><![CDATA[mental health]]></kwd>
<kwd lng="en"><![CDATA[students, dental]]></kwd>
</kwd-group>
</article-meta>
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