<?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>2007-1523</journal-id>
<journal-title><![CDATA[Revista mexicana de trastornos alimentarios]]></journal-title>
<abbrev-journal-title><![CDATA[Rev. Mex. de trastor. aliment]]></abbrev-journal-title>
<issn>2007-1523</issn>
<publisher>
<publisher-name><![CDATA[Universidad Nacional Autónoma de México, Facultad de Estudios Superiores Iztacala]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S2007-15232011000100006</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Comparación de rasgos de personalidad entre pacientes con trastorno de la conducta alimentaria y sus hermanas sanas]]></article-title>
<article-title xml:lang="en"><![CDATA[Personality traits comparison between eating disorder patients and their healthy siblings]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Agüera]]></surname>
<given-names><![CDATA[Zaida]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Jiménez-Murcia]]></surname>
<given-names><![CDATA[Susana]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Granero]]></surname>
<given-names><![CDATA[Roser]]></given-names>
</name>
<xref ref-type="aff" rid="A04"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Penelo]]></surname>
<given-names><![CDATA[Eva]]></given-names>
</name>
<xref ref-type="aff" rid="A04"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Wagner]]></surname>
<given-names><![CDATA[Gudrun]]></given-names>
</name>
<xref ref-type="aff" rid="A05"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Karwautz]]></surname>
<given-names><![CDATA[Andreas]]></given-names>
</name>
<xref ref-type="aff" rid="A05"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Riesco]]></surname>
<given-names><![CDATA[Nadine]]></given-names>
</name>
<xref ref-type="aff" rid="A02"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Menchón]]></surname>
<given-names><![CDATA[José Manuel]]></given-names>
</name>
<xref ref-type="aff" rid="A06"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Fernández-Aranda]]></surname>
<given-names><![CDATA[Fernando]]></given-names>
</name>
<xref ref-type="aff" rid="A03"/>
</contrib>
</contrib-group>
<aff id="A01">
<institution><![CDATA[,Instituto Salud Carlos III Ciber Fisiopatologia Obesidad y Nutricion ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>España</country>
</aff>
<aff id="A02">
<institution><![CDATA[,Hospital Universitario de Bellvitge-IDIBELL Departamento de Psiquiatría ]]></institution>
<addr-line><![CDATA[Barcelona ]]></addr-line>
<country>España</country>
</aff>
<aff id="A03">
<institution><![CDATA[,Universidad de Barcelona Facultad de Medicina Departamento de Ciencias Clínicas]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>España</country>
</aff>
<aff id="A04">
<institution><![CDATA[,Universitat Autònoma de Barcelona Departament de Psicobiologia i Metodologia Laboratori d'Estadística Aplicada]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>España</country>
</aff>
<aff id="A05">
<institution><![CDATA[,Medical University of Vienna Department of Child and Adolescent Psychiatry Eating Disorders Unit]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>Austria</country>
</aff>
<aff id="A06">
<institution><![CDATA[,Instituto Salud Carlos III CIBER Salud Mental ]]></institution>
<addr-line><![CDATA[Barcelona ]]></addr-line>
<country>España</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>06</month>
<year>2011</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>06</month>
<year>2011</year>
</pub-date>
<volume>2</volume>
<numero>1</numero>
<fpage>53</fpage>
<lpage>61</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S2007-15232011000100006&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S2007-15232011000100006&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S2007-15232011000100006&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[Los objetivos del presente estudio con pacientes-hermanas fueron: 1) Analizar diferencias existentes en sintomatología alimentaria y psicopatología general entre pacientes con trastorno alimentario (TCA) y hermanas discordantes para el trastorno, 2) Identificar en qué medida pacientes y hermanas presentan vulnerabilidades de personalidad diferenciales; 3) Identificar factores predictores de aparición de un trastorno alimentario. La muestra estuvo formada por 92 participantes mujeres (46 pacientes TCA vs 46 hermanas sanas). Todos los pacientes cumplían criterios DSM-IV-TR para el TCA. Los resultados mostraron diferencias significativas en todas las escalas de sintomatología alimentaria y psicopatología general entre ambos grupos. En términos de rasgos de personalidad, las pacientes con TCA presentaban una mayor evitación del daño (p<.001) y menor autodirección (p<.001) al ser comparadas con sus hermanas discordantes para el trastorno. Finalmente, los resultados mostraron que haber tenido historia previa de obesidad o sobrepeso (p=.027) y rasgos específicos de temperamento (elevada evitación al daño; p=.025) y carácter (baja autodirección; p=.009) se asociaban al posterior desarrollo de un TCA. La combinación de factores ambientales no compartidos, tales como obesidad con vulnerabilidades específicas de personalidad, influyen en la posterior aparición de un trastorno de la conducta alimentaria.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[The aims of the study were threefold: 1) analyze differences in symptomatology and general psychopathology among eating disorder (ED) patients and their sisters discordant for eating disorders, 2) identify differential personality vulnerabilities between ED patients and their healthy sisters and 3) identify predictors of developing an eating disorder. The sample consisted of 92 female participants (46 ED patients fulfilling DSM-IV-TR criteria for eating disorders vs 46 healthy sisters). The results showed significant differences in eating symptomatology and general psychopathology. In terms of personality traits, ED patients had higher harm avoidance (p<.001) and lower self-directedness (p<.001) compared with their discordant sister. Finally, the results showed that having a history of obesity or overweight (p=.027), and specific traits of temperament (high scores on harm avoidance; p=.025) and character (low self-directedness; p=.009) were associated with the development of an ED. These findings allow to conclude that the combination of non-shared environmental factors such as obesity with specific vulnerabilities of personality, influence the subsequent emergence of an eating disorder.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[Trastornos alimentarios]]></kwd>
<kwd lng="es"><![CDATA[Rasgos de personalidad]]></kwd>
<kwd lng="es"><![CDATA[hermanas]]></kwd>
<kwd lng="es"><![CDATA[predictores]]></kwd>
<kwd lng="es"><![CDATA[obesidad]]></kwd>
<kwd lng="en"><![CDATA[Eating disorders]]></kwd>
<kwd lng="en"><![CDATA[Personality traits]]></kwd>
<kwd lng="en"><![CDATA[siblings]]></kwd>
<kwd lng="en"><![CDATA[predictors]]></kwd>
<kwd lng="en"><![CDATA[obesity]]></kwd>
</kwd-group>
</article-meta>
</front><body><![CDATA[  	    <p align="justify"><font face="verdana" size="4">Art&iacute;culos</font></p>  	    <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>  	    <p align="center"><font face="verdana" size="4"><b>Comparaci&oacute;n de rasgos de personalidad entre pacientes con trastorno de la conducta alimentaria y sus hermanas sanas</b></font></p>  	    <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>  	    <p align="center"><font face="verdana" size="3"><b>Personality traits comparison between eating disorder patients and their healthy siblings</b></font></p>  	    <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>  	    <p align="center"><font face="verdana" size="2"><b>Zaida Ag&uuml;era<sup>1,2</sup>, Susana Jim&eacute;nez&#45;Murcia<sup>1,2,3</sup>, Roser Granero<sup>4</sup>, Eva Penelo<sup>4</sup>, Gudrun Wagner<sup>5</sup>, Andreas Karwautz<sup>5</sup>, Nadine Riesco<sup>2</sup>, Jos&eacute; Manuel Mench&oacute;n<sup>2,3,6</sup> y Fernando Fern&aacute;ndez&#45;Aranda<sup>1,2,3</sup></b></font></p>  	    <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>  	    <p align="justify"><font face="verdana" size="2"><sup><i>1</i></sup> <i>Ciber Fisiopatologia Obesidad y Nutricion (CIBERObn), Instituto Salud Carlos III, Espa&ntilde;a.</i></font></p>  	    ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2"><i><sup>2</sup> Departmento de Psiquiatr&iacute;a, Hospital Universitario de Bellvitge&#45;IDIBELL, Barcelona, Espa&ntilde;a.</i></font></p>  	    <p align="justify"><font face="verdana" size="2"><i><sup>3</sup> Departamento de Ciencias Cl&iacute;nicas, Facultad de Medicina, Universidad de Barcelona, Espa&ntilde;a.</i></font></p>  	    <p align="justify"><font face="verdana" size="2"><i><sup>4</sup> Laboratori d'Estad&iacute;stica Aplicada, Departament de Psicobiologia i Metodologia, Universitat Aut&ograve;noma de Barcelona, Espa&ntilde;a.</i></font></p>  	    <p align="justify"><font face="verdana" size="2"><i><sup>5</sup> Eating Disorders Unit at the Department of Child and Adolescent Psychiatry, Medical University of Vienna, Austria.</i></font></p>  	    <p align="justify"><font face="verdana" size="2"><i><sup>6</sup> CIBER Salud Mental (CIBERSAM), Instituto Salud Carlos III, Barcelona, Espa&ntilde;a.</i></font></p>  	    <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>  	    <p align="justify"><font face="verdana" size="2">Recibido: 04/07/2011    <br> 	Revisado: 11/07/2011    <br> 	Aceptado: 12/07/2011</font></p>  	    <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>  	    ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2"><b>Correspondencia:</b>    <br>     <i>Fernando Fern&aacute;ndez Aranda,    <br> 	Coordinador Unidad TCA y Jefe de Grupo,    <br> 	Servicio de Psiquiatr&iacute;a y CIBEROBN,    <br> 	Hospital Universitario de Bellvitge,    <br> 	c/ Feixa Llarga s/n, 08907&#45; Barcelona, Espa&ntilde;a</i>    <br> 	(e&#45;mail: <a href="mailto:ffernandez@bellvitgehospital.cat">ffernandez@bellvitgehospital.cat</a>;    <br> 	<i>Tel. +34&#45;932607227; fax. +34&#45; 932607193)</i></font></p>  	    <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>  	    <p align="justify"><font face="verdana" size="2"><b>Resumen</b></font></p>  	    ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2">Los objetivos del presente estudio con pacientes&#45;hermanas fueron: 1) Analizar diferencias existentes en sintomatolog&iacute;a alimentaria y psicopatolog&iacute;a general entre pacientes con trastorno alimentario (TCA) y hermanas discordantes para el trastorno, 2) Identificar en qu&eacute; medida pacientes y hermanas presentan vulnerabilidades de personalidad diferenciales; 3) Identificar factores predictores de aparici&oacute;n de un trastorno alimentario. La muestra estuvo formada por 92 participantes mujeres (46 pacientes TCA vs 46 hermanas sanas). Todos los pacientes cumpl&iacute;an criterios DSM&#45;IV&#45;TR para el TCA. Los resultados mostraron diferencias significativas en todas las escalas de sintomatolog&iacute;a alimentaria y psicopatolog&iacute;a general entre ambos grupos. En t&eacute;rminos de rasgos de personalidad, las pacientes con TCA presentaban una mayor evitaci&oacute;n del da&ntilde;o (<i>p</i>&lt;.001) y menor autodirecci&oacute;n (<i>p</i>&lt;.001) al ser comparadas con sus hermanas discordantes para el trastorno. Finalmente, los resultados mostraron que haber tenido historia previa de obesidad o sobrepeso (<i>p</i>=.027) y rasgos espec&iacute;ficos de temperamento (elevada evitaci&oacute;n al da&ntilde;o; <i>p</i>=.025) y car&aacute;cter (baja autodirecci&oacute;n; <i>p</i>=.009) se asociaban al posterior desarrollo de un TCA. La combinaci&oacute;n de factores ambientales no compartidos, tales como obesidad con vulnerabilidades espec&iacute;ficas de personalidad, influyen en la posterior aparici&oacute;n de un trastorno de la conducta alimentaria.</font></p>  	    <p align="justify"><font face="verdana" size="2"><b>Palabras clave:</b> Trastornos alimentarios, Rasgos de personalidad, hermanas, predictores, obesidad.</font></p>  	    <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>  	    <p align="justify"><font face="verdana" size="2"><b>Abstract</b></font></p>  	    <p align="justify"><font face="verdana" size="2">The aims of the study were threefold: 1) analyze differences in symptomatology and general psychopathology among eating disorder (ED) patients and their sisters discordant for eating disorders, 2) identify differential personality vulnerabilities between ED patients and their healthy sisters and 3) identify predictors of developing an eating disorder. The sample consisted of 92 female participants (46 ED patients fulfilling DSM&#45;IV&#45;TR criteria for eating disorders vs 46 healthy sisters). The results showed significant differences in eating symptomatology and general psychopathology. In terms of personality traits, ED patients had higher harm avoidance (<i>p</i>&lt;.001) and lower self&#45;directedness (<i>p</i>&lt;.001) compared with their discordant sister. Finally, the results showed that having a history of obesity or overweight (<i>p</i>=.027), and specific traits of temperament (high scores on harm avoidance; <i>p</i>=.025) and character (low self&#45;directedness; <i>p</i>=.009) were associated with the development of an ED. These findings allow to conclude that the combination of non&#45;shared environmental factors such as obesity with specific vulnerabilities of personality, influence the subsequent emergence of an eating disorder.</font></p>  	    <p align="justify"><font face="verdana" size="2"><b>Key words:</b> Eating disorders, Personality traits, siblings, predictors, obesity.</font></p>  	    <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>  	    <p align="justify"><font face="verdana" size="2"><b>Introducci&oacute;n</b></font></p>  	    <p align="justify"><font face="verdana" size="2">Los trastornos de la conducta alimentaria (TCA) se encuentran parcialmente determinados, tanto por factores familiares (Lilenfeld et al., 1998; Strober, Freeman, Lampert, Diamond, &amp; Kaye, 2000), ambiente compartido (Fernandez&#45;Aranda et al., 2007; Jacobi, Hayward, de Zwaan, Kraemer, &amp; Agras, 2004; Krug et al., 2009), factores gen&eacute;ticos (Bulik, 2005; Gorwood et al., 2002; Mercader et al., 2010; Ribases et al., 2005), as&iacute; como por la interacci&oacute;n entre unos y otros (Karwautz et al., 2011). Sin embargo ni unos ni otros, de forma independiente, explicar&iacute;an el riesgo de padecerlos. De ah&iacute;, el reciente inter&eacute;s por analizar la relevancia de los factores ambientales no compartidos ("nonshared or unique environmental effects") (Klump, Wonderlich, Lehoux, Lilenfeld, &amp; Bulik, 2002), en la posterior aparici&oacute;n de un trastorno de la conducta alimentaria. De hecho, estos factores explicar&iacute;an la raz&oacute;n por la cual hermanos gemelos, que han crecido en el mismo ambiente familiar, pueden diferenciarse respecto a su conducta alimentaria, siendo patol&oacute;gica en unos casos mientras que en otros no (Bulik, Sullivan, &amp; Kendler, 1998; Bulik, Sullivan, Wade, &amp; Kendler, 2000; Wade, Bulik, Sullivan, Neale, &amp; Kendler, 2000). Entre estos factores ambientales no compartidos se han descrito el trato diferencial que pueda darse a los hermanos por parte de los padres, rasgos de personalidad, el estilo relacional de los sujetos, life&#45;events, entre otras caracter&iacute;sticas espec&iacute;ficas. En este sentido, diversos estudios han demostrado que entre el 24%&#45; 42% de la varianza en anorexia nerviosa (AN) (Wade, Bulik, Sullivan, Neale, &amp; Kendler, 2000) y entre el 17%&#45; 46% de la varianza en bulimia nerviosa (BN) (Bulik, Sullivan, &amp; Kendler, 1998; Bulik, Sullivan, Wade, &amp; Kendler, 2000; Kendler et al., 1995), quedar&iacute;a explicada por la influencia de factores ambientales no compartidos.</font></p>  	    <p align="justify"><font face="verdana" size="2">En relaci&oacute;n a la personalidad, como uno de los factores no compartidos, numerosos estudios han analizado las caracter&iacute;sticas comunes de temperamento y car&aacute;cter en sujetos diagnosticados de un TCA (Cassin &amp; von Ranson, 2005). La mayor&iacute;a de estudios sobre TCA coinciden al obtener puntuaciones similares en determinados rasgos de personalidad, tales como elevada Evitaci&oacute;n del da&ntilde;o (Bulik, Sullivan, Fear, &amp; Pickering, 2000; Fassino et al., 2002; Klump et al., 2000), baja Autodirecci&oacute;n (Alvarez&#45;Moya et al., 2007; Fassino et al., 2002; Klump et al., 2000) y baja Cooperatividad (Fassino et al., 2002; Fassino, Daga, Piero, Leombruni, &amp; Rovera, 2001; Klump et al., 2000). Sin embargo, al considerar distintos subtipos de TCA se encuentra una menor coincidencia en aspectos de temperamento y car&aacute;cter. Mientras que en BN se identifican elevadas puntuaciones en la escala de B&uacute;squeda de Sensaciones (Alvarez&#45;Moya et al., 2007; Fassino et al., 2002; Fernandez&#45;Aranda et al., 2006), en AN se obtiene elevada Persistencia y bajas puntuaciones en la escala de B&uacute;squeda de Sensaciones (Bloks, Hoek, Callewaert, &amp; van Furth, 2004; Klump et al., 2000; Klump et al., 2004).</font></p>  	    ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2">A pesar de la existencia de numerosos estudios que describen la importancia de los rasgos de personalidad en la g&eacute;nesis y mantenimiento de un TCA, son escasos los estudios que han analizado la personalidad, como factor ambiental no compartido, entre pacientes con un TCA y hermanas sanas (Amianto, Abbate&#45;Daga, Morando, Sobrero, &amp; Fassino, 2011; Benninghoven, Tetsch, &amp; Jantschek, 2008; Lehoux &amp; Howe, 2007). Adem&aacute;s, los escasos estudios que han utilizado un dise&ntilde;o con hermanas presentan muestras muy limitadas y heterog&eacute;neas, en las que incluyen tanto mujeres como varones, con AN o BN, pero sin considerar los otros diagn&oacute;sticos de patolog&iacute;a alimentaria.</font></p>  	    <p align="justify"><font face="verdana" size="2">Hasta donde los autores conocen, este es el primer estudio que incluye una muestra &uacute;nicamente de mujeres que presentan los diferentes diagn&oacute;sticos de TCA. En esta l&iacute;nea, este estudio es de gran relevancia, ya que nos permite conocer el papel que juegan determinados rasgos de personalidad como factores de riesgo o protectores ante un TCA. Asimismo, este tipo de dise&ntilde;o, con hermanas discordantes, tiene la ventaja de que muchas variables gen&eacute;ticas y ambientales son compartidas, lo que permite identificar factores de riesgo espec&iacute;ficos (Dick, Johnson, Viken, &amp; Rose, 2000).</font></p>  	    <p align="justify"><font face="verdana" size="2">Por todo ello, los objetivos del presente estudio han sido: 1) analizar diferencias existentes en sintomatolog&iacute;a alimentaria y psicopatolog&iacute;a general entre pacientes con TCA y hermanas discordantes para el trastorno, 2) identificar en qu&eacute; medida pacientes y hermanas presentan vulnerabilidades de personalidad diferenciales y, por &uacute;ltimo, 3) identificar factores predictores de aparici&oacute;n de TCA, al comparar pacientes y hermanas sanas.</font></p>  	    <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>  	    <p align="justify"><font face="verdana" size="2"><b>M&eacute;todo</b></font></p>  	    <p align="justify"><font face="verdana" size="2"><i>Participantes</i></font></p>  	    <p align="justify"><font face="verdana" size="2">Este estudio incluy&oacute; a una muestra de 92 participantes, que estaba formada por: a) un grupo cl&iacute;nico de 46 pacientes mujeres con TCA &#91;24 AN, 18 BN y 4 trastorno alimentario no especificado (TCANE)&#93; y b) un grupo control de 46 hermanas sanas. Todas las pacientes con TCA fueron diagnosticadas seg&uacute;n criterios DSM&#45;IV&#45;TR (APA, 2000) y acudieron de forma consecutiva a la Unidad de Trastornos de la Conducta Alimentaria del Hospital Universitario de Bellvitge (HUB), para evaluaci&oacute;n y tratamiento.</font></p>  	    <p align="justify"><font face="verdana" size="2">Este estudio ha sido aprobado por el Comit&eacute; &Eacute;tico de nuestra instituci&oacute;n y todas las participantes firmaron el consentimiento informado correspondiente.</font></p>  	    <p align="justify"><font face="verdana" size="2"><i>Instrumentos</i></font></p>  	    <p align="justify"><font face="verdana" size="2">A todas las participantes, tanto pacientes como hermanas sanas, se les administr&oacute; una bater&iacute;a por el <i>Ea</i><i>ting Disorders Inventory</i> (EDI&#45; 2; Garner, 1998), el <i>Bulimic Investigatory Test Edinburgh</i> (BITE; Henderson &amp; Freeman, 1987), el <i>Symptom Checklist&#45;</i><i>Revised</i> (SCL&#45;90&#45;R; Derogatis, 1990) y el <i>Tempe</i><i>rament and Character Inventory&#45;Revised</i> (TCI&#45;R; Cloninger, 1999). Adem&aacute;s, todas las participantes fueron evaluadas mediante una entrevista cl&iacute;nica semiestructurada para valorar sintomatolog&iacute;a cl&iacute;nica y psicopatol&oacute;gica (Fernandez&#45;Aranda &amp; Turon, 1998).</font></p>  	    ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2">&#45; <i>Eating Disorders Inventory</i> (EDI&#45; 2; Garner, 1991): es un cuestionario de 91 &iacute;tems autoadministrado, que est&aacute; dise&ntilde;ado para evaluar dimensiones psicol&oacute;gicas y conductuales caracter&iacute;sticas de los Trastornos de la Conducta Alimentaria. Consta de 11 subescalas (Obsesi&oacute;n por la delgadez, Bulimia, Insatisfacci&oacute;n corporal, Ineficacia, Perfeccionismo, Desconfianza interpersonal, Conciencia interoceptiva, y Miedo a la madurez, Perfeccionismo, Impulsividad, Ascetismo e Inseguridad Social. Esta escala ha sido validada en poblaci&oacute;n espa&ntilde;ola (Garner, 1998) y ha demostrado una consistencia interna de 0.68 (alfa de Cronbach).</font></p>  	    <p align="justify"><font face="verdana" size="2">&#45; <i>Bulimic Investigatory Test Edinburgh</i> (BITE; Henderson &amp; Freeman, 1987). Este cuestionario contiene 33 &iacute;tems que miden presencia y severidad de sintomatolog&iacute;a bul&iacute;mica. Tiene dos subescalas: la de sintomatolog&iacute;a (30 &iacute;tems) que determina la seriedad de los s&iacute;ntomas, y la de severidad (3 &iacute;tems) que ofrece un &iacute;ndice de severidad. Esta escala ha sido validada en poblaci&oacute;n espa&ntilde;ola (Rivas, Bernab&eacute;, &amp; Jim&eacute;nez, 2004) obteniendo una consistencia interna alta de 0.96 (alfa de Cronbach).</font></p>  	    <p align="justify"><font face="verdana" size="2">&#45; <i>Symptom Checklist revised</i> (SCL&#45;90&#45;R; Derogatis, 1990): es un cuestionario de 90 &iacute;tems autoadministrado que fue dise&ntilde;ado para evaluar malestar psicol&oacute;gico y/o psicopatol&oacute;gico. Este cuestionario eval&uacute;a 9 de las principales dimensiones sintomatol&oacute;gicas (Somatizaci&oacute;n, Obsesivo&#45;compulsivo, Sensibilidad interpersonal, Depresi&oacute;n, Ansiedad, Hostilidad, Ansiedad f&oacute;bica, Ideaci&oacute;n paranoide y Psicoticismo. Esta escala ha sido validada en poblaci&oacute;n espa&ntilde;ola (Derogatis, 2002) obteniendo una consistencia interna de 0.75 (alfa de Cronbach).</font></p>  	    <p align="justify"><font face="verdana" size="2">&#45; T<i>emperament and Character Inventory&#45;Revised</i> (TCI&#45;R; Cloninger, 1999): este cuestionario consta de 240 &iacute;tems con formato de respuesta de 5 puntos y tipo Likert que miden, al igual que la versi&oacute;n original del TCI (Cloninger, Svrakic, &amp; Przybeck, 1993), siete dimensiones de la personalidad: cuatro de temperamento (Evitaci&oacute;n del Da&ntilde;o (HA), B&uacute;squeda de Sensaciones (NS), Dependencia a la Recompensa (RD) y Persistencia (PS)) y tres dimensiones de car&aacute;cter (Autodirecci&oacute;n (SD), Cooperaci&oacute;n (C) y Autotrascendencia (ST)). La versi&oacute;n espa&ntilde;ola (Gutierrez et al., 2001) y la versi&oacute;n revisada del cuestionario han sido documentadas en la literatura (Gutierrez&#45;Zotes et al., 2004). Las escalas han mostrado una consistencia interna de 0.87 (alfa de Cronbach).</font></p>  	    <p align="justify"><font face="verdana" size="2">&#45; <i>Evaluaci&oacute;n de variables cl&iacute;nicas y sociodemo</i><i>gr&aacute;ficas</i>: informaci&oacute;n adicional como edad, estado civil, educaci&oacute;n, situaci&oacute;n laboral, motivaci&oacute;n para recibir tratamiento, antecedentes personales y familiares y otras variables cl&iacute;nicas relevantes para evaluar la sintomatolog&iacute;a cl&iacute;nica fueron evaluadas mediante una entrevista cl&iacute;nica semi&#45;estructurada (Fernandez&#45;Aranda &amp; Turon, 1998).</font></p>  	    <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>  	    <p align="justify"><font face="verdana" size="2"><b>Procedimiento</b></font></p>  	    <p align="justify"><font face="verdana" size="2">Todas las participantes fueron evaluadas en la unidad de Trastornos de la Conducta Alimentaria, del Servicio de Psiquiatr&iacute;a, del Hospital Universitario de Bellvitge. Las pacientes fueron entrevistadas en una primera sesi&oacute;n por psic&oacute;logos y psiquiatras especializados en el diagn&oacute;stico y tratamiento de estos trastornos, con m&aacute;s de 10 a&ntilde;os de experiencia. Esta primera entrevista aportaba informaci&oacute;n sobre el motivo de consulta, la sintomatolog&iacute;a actual, antecedentes personales y familiares y otros datos de inter&eacute;s. Dicha sesi&oacute;n se realiza de forma habitual en nuestra Unidad y sirvi&oacute; para determinar la inclusi&oacute;n de la paciente en el estudio, as&iacute; como para informarle del mismo y pedir su consentimiento firmado de participaci&oacute;n. Una semana despu&eacute;s de la primera entrevista, las pacientes fueron evaluadas con la bater&iacute;a de escalas cl&iacute;nicas, descritas anteriormente, en una sesi&oacute;n de aproximadamente 1,30 h de duraci&oacute;n. Posteriormente se cit&oacute; a las hermanas discordantes para el trastorno, que hab&iacute;an accedido a participar en el estudio, para ser evaluadas con la misma bater&iacute;a de cuestionarios.</font></p>  	    <p align="justify"><font face="verdana" size="2"><i>An&aacute;lisis estad&iacute;stico</i></font></p>  	    <p align="justify"><font face="verdana" size="2">El an&aacute;lisis estad&iacute;stico se llev&oacute; a cabo mediante SPSS 18 para <i>Windows</i>. Dado que los datos de este estudio tienen una estructura anidada (hermanas sanas y pacientes TCA proceden de la misma familia), y debido al nivel extremadamente bajo de anidamiento (cada familia proporciona un &uacute;nico par de hermanas), se descart&oacute; el uso de modelos multinivel puesto que en estas situaciones no aportan ajuste adecuado (Hox, 2002). Para modelar la dependencia existente en los datos y evitar sesgos de estimaci&oacute;n, el factor aleatorio intra&#45;grupo "familia" se incluy&oacute; en modelos m&uacute;ltiples mixtos mediante Ecuaciones de Estimaci&oacute;n Generalizadas (procedimiento GEE en el sistema SPSS) que comparaban los perfiles cl&iacute;nicos y de personalidad para los dos grupos del estudio (pacientes con TCA vs sus hermanas sanas). Estos modelos se ajustaron mediante la distribuci&oacute;n binomial y la funci&oacute;n de enlace <i>Logit</i> para criterios binarios y con la distribuci&oacute;n Normal y la funci&oacute;n de enlace Identidad para variables cuantitativas.</font></p>  	    ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2">&nbsp;</font></p>  	    <p align="justify"><font face="verdana" size="2"><b>Resultados</b></font></p>  	    <p align="justify"><font face="verdana" size="2"><i>Variables sociodemogr&aacute;ficas</i></font></p>  	    <p align="justify"><font face="verdana" size="2">La edad media de la muestra total fue de 26.01 (<i>DE</i>=6.77) &#91;casos: <i>M</i>=25.3 (<i>DE</i>=4.7); controles <i>M</i>= 26.7 (<i>DE</i>=8.3); <i>p</i>=0.350&#93;. No se encontraron diferencias significativas en estado civil, nivel educativo o situaci&oacute;n laboral. La mayor&iacute;a de las participantes eran solteras (casos: 85.4%; controles: 75%; <i>p</i>= 0.252), hab&iacute;an completado estudios superiores (casos: 60.7%; controles: 55%; <i>p</i>= 0.585) y se encontraban trabajando (casos: 58.5%; controles: 71.4%; <i>p</i>= 0.242). S&oacute;lo se encontraron diferencias significativas en la edad de menarqu&iacute;a &#91;casos: 12.9 (<i>DE</i>=1.2); controles: 12.3 (<i>DE</i>=1.3); <i>p</i>= 0.037&#93;.</font></p>  	    <p align="justify"><font face="verdana" size="2"><i>Caracter&iacute;sticas cl&iacute;nicas y sintomatol&oacute;gicas</i></font></p>  	    <p align="justify"><font face="verdana" size="2">La muestra total de pacientes con TCA presentaba una frecuencia semanal de 3.59 episodios de sobreingesta (<i>DE</i>=4.7), 6.78 conductas de v&oacute;mito (<i>DE</i>=7.9), 1.97 uso de laxantes (<i>DE</i>=4.6) y 0.24 uso de diur&eacute;ticos (<i>DE</i>=1.2).</font></p>  	    <p align="justify"><font face="verdana" size="2">Como se puede observar en la <a href="#t1">Tabla 1</a>, no se encontraron diferencias significativas respecto al &iacute;ndice de masa corporal (IMC) m&aacute;ximo conseguido a lo largo de la vida, pero s&iacute; respecto al IMC actual e IMC m&iacute;nimo. Tampoco se encontraron diferencias significativas en obesidad/sobrepeso prem&oacute;rbido.</font></p>     <p align="center"><font face="verdana" size="2"><a name="t1"></a></font></p>  	    <p align="center"><font face="verdana" size="2"><img src="/img/revistas/rmta/v2n1/a6t1.jpg"></font></p>      	    <p align="justify"><font face="verdana" size="2">La <a href="#t1">Tabla 1</a> tambi&eacute;n contiene los resultados de la comparaci&oacute;n de medias por procedimiento GEE para la sintomatolog&iacute;a alimentaria (BITE y EDI&#45;2) entre las pacientes con TCA y el grupo control de hermanas sanas. Como era esperable, las pacientes con TCA mostraron puntuaciones significativamente m&aacute;s elevadas en todas las escalas del EDI&#45;2 y el BITE respecto al grupo control.</font></p>  	    ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2"><i>Caracter&iacute;sticas psicopatol&oacute;gicas generales y de per</i><i>sonalidad</i></font></p>  	    <p align="justify"><font face="verdana" size="2">La <a href="#t2">Tabla 2</a> muestra los resultados para las diferencias entre psicopatolog&iacute;a com&oacute;rbida y personalidad entre pacientes TCA y sus hermanas control. Se observaron diferencias significativas para todas las escalas del SCL&#45;90&#45;R y para las escalas de "evitaci&oacute;n del da&ntilde;o" y "auto&#45;direcci&oacute;n" del TCI&#45;R.</font></p>  	    <p align="center"><font face="verdana" size="2"><a name="t2"></a></font></p>  	    <p align="center"><font face="verdana" size="2"><img src="/img/revistas/rmta/v2n1/a6t2.jpg"></font></p>  	    <p align="justify"><font face="verdana" size="2"><i>Modelo predictivo de TCA</i></font></p>  	    <p align="justify"><font face="verdana" size="2">En la <a href="#t3">Tabla 3</a> se presenta el modelo inicial de partida y el modelo final con las variables que resultaron ser predictoras del TCA. En el modelo inicial se incluyeron todas las variables sociodemogr&aacute;ficas y referentes a la historia de los sujetos que previamente hab&iacute;an resultado significativas o casi significativas al comparar pacientes vs controles. El modelo final se obtuvo mediante un proceso de estimaci&oacute;n secuencial por pasos, y se retuvieron &uacute;nicamente las variables con contribuci&oacute;n estad&iacute;sticamente significativa. Este modelo indica que puntuaciones elevadas en la escala "evitaci&oacute;n del da&ntilde;o", puntuaciones bajas en la escala "auto&#45;direcci&oacute;n" del TCI&#45;R y una historia previa de obesidad o sobrepeso constituyen factores de riesgo para la aparici&oacute;n de un trastorno alimentario.</font></p>  	    <p align="center"><font face="verdana" size="2"><a name="t3"></a></font></p>  	    <p align="center"><font face="verdana" size="2"><img src="/img/revistas/rmta/v2n1/a6t3.jpg"></font></p>  	    <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>  	    <p align="justify"><font face="verdana" size="2"><b>Discusi&oacute;n</b></font></p>  	    ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2">Hasta donde los autores conocen, &eacute;ste es el primer estudio que compara pacientes con diagn&oacute;stico de trastorno alimentario con sus hermanas sanas, utilizando una amplia muestra de participantes, todas ellas mujeres, e incluyendo los diferentes diagn&oacute;sticos de TCA (AN, BN y TCANE). El presente estudio analiz&oacute; las diferencias existentes en sintomatolog&iacute;a alimentaria y psicopatolog&iacute;a general en pacientes con TCA y hermanas discordantes para el trastorno. Adem&aacute;s, permiti&oacute; evaluar las caracter&iacute;sticas de personalidad que difer&iacute;an entre las pacientes y sus hermanas e identificar factores de riesgo o protecci&oacute;n para el desarrollo de un TCA. El principal hallazgo fue identificar que el hecho de haber tenido historia previa de obesidad/sobrepeso y presentar determinados rasgos de personalidad, como elevada evitaci&oacute;n del da&ntilde;o y baja autodirecci&oacute;n, actuaba como factores de vulnerabilidad y predispon&iacute;an para desarrollar un trastorno alimentario.</font></p>  	    <p align="justify"><font face="verdana" size="2"><i>Diferencias sintomatol&oacute;gicas y psicopatol&oacute;gicas en</i><i>tre TCA y hermanas discordantes</i></font></p>  	    <p align="justify"><font face="verdana" size="2">Como era de esperar, nuestros resultados mostraron que las pacientes con TCA presentaban mayor sintomatolog&iacute;a alimentaria y psicopatolog&iacute;a general que sus hermanas controles.</font></p>  	    <p align="justify"><font face="verdana" size="2">Los altos niveles de psicopatolog&iacute;a general en pacientes con TCA han sido descritos ampliamente en la literatura (Garcia&#45;Alba, 2004; McDermott, Forbes, Harris, McCormack, &amp; Gibbon, 2006; Muratori, Viglione, Maestro &amp; Picchi, 2004).</font></p>  	    <p align="justify"><font face="verdana" size="2"><i>Vulnerabilidades de personalidad diferenciales entre</i> <i>TCA y hermanas discordantes</i></font></p>  	    <p align="justify"><font face="verdana" size="2">Con respecto a la personalidad, nuestros resultados mostraron que las pacientes con TCA presentaban mayor evitaci&oacute;n del da&ntilde;o y menor autodirecci&oacute;n que sus hermanas sanas. Estos resultados coinciden con los de estudios previos en poblaci&oacute;n cl&iacute;nica (Alvarez&#45;Moya et al., 2007; Bulik, Sullivan, Fear, &amp; Pickering, 2000; Fassino et al., 2002; Klump et al., 2000). Sin embargo, difieren de otros estudios realizados con hermanas, que encontraron una mayor impulsividad y/o b&uacute;squeda de sensaciones (Lehoux &amp; Howe, 2007) o una mayor persistencia y menor auto&#45;trascendencia (Amianto, Abbate&#45;Daga, Morando, Sobrero, &amp; Fassino, 2011) en pacientes con TCA, respecto a sus hermanas sanas. La justificaci&oacute;n de esta diferencia en nuestros resultados podr&iacute;amos hallarla en el hecho de que incluimos en la muestra todos los diagn&oacute;sticos, y los estudios mencionados s&oacute;lo consideraban pacientes con BN, concretamente en el primero estudio, o con AN en el segundo.</font></p>  	    <p align="justify"><font face="verdana" size="2"><i>Factores predictores para el desarrollo de un TCA</i></font></p>  	    <p align="justify"><font face="verdana" size="2">Nuestros resultados mostraron que haber tenido una obesidad o sobrepeso previo actuaba como factor de riesgo para desarrollar un TCA. Estos resultados son acordes con estudios previos (Burrows &amp; Cooper, 2002; Fairburn, Cooper, Doll, &amp; Welch, 1999; Hebebrand et al., 2002).</font></p>  	    <p align="justify"><font face="verdana" size="2">Por otro lado, una elevada evitaci&oacute;n del da&ntilde;o y una baja autodirecci&oacute;n tambi&eacute;n mostraron ser factores predictores para la aparici&oacute;n de un trastorno alimentario. Estos resultados est&aacute;n en concordancia con los de otros autores, que sugieren que estos dos rasgos de personalidad son potenciales factores de vulnerabilidad para desarrollar un TCA (Lilenfeld et al., 2000) y contribuyen a la etiopatog&eacute;nesis del trastorno (Wagner et al., 2006). En la misma l&iacute;nea, el estudio de Amianto et al. (2011) demuestra que una menor evitaci&oacute;n del da&ntilde;o y mayor autodirecci&oacute;n puede actuar como factor protector para el desarrollo del trastorno.</font></p>  	    <p align="justify"><font face="verdana" size="2"><i>Limitaciones y contribuciones del estudio</i></font></p>  	    ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2">Este estudio presenta algunas limitaciones, pero tambi&eacute;n contribuye al avance del conocimiento sobre estos complejos trastornos. Una primera limitaci&oacute;n a tener en cuenta es la ausencia de un grupo de control, sin antecedentes familiares de trastorno alimentario, que permitiera evaluar las diferencias entre &eacute;ste y las hermanas sanas de pacientes con TCA. En segundo lugar, el dise&ntilde;o transversal del estudio no permite determinar causalidad entre las variables evaluadas. Pero por otra parte, el presente estudio tambi&eacute;n presenta puntos fuertes. En primer lugar, la elecci&oacute;n de las hermanas con edades lo m&aacute;s pr&oacute;ximas posibles (no m&aacute;s de 6 a&ntilde;os de diferencia) como sujetos de control, nos permite hacer una comparaci&oacute;n lo m&aacute;s directa posible y controlar las variables de influencia del ambiente compartido, por miembros de la familia. Adem&aacute;s, un dise&ntilde;o de hermanas discordantes tiene la ventaja de que muchas variables gen&eacute;ticas y ambientales son compartidas entre las hermanas, lo que permite identificar factores de riesgo espec&iacute;ficos (Dick, Johnson, Viken, &amp; Rose, 2000).</font></p>  	    <p align="justify"><font face="verdana" size="2"><i>Conclusiones</i></font></p>  	    <p align="justify"><font face="verdana" size="2">A modo de conclusi&oacute;n, nuestros resultados mostraron que el presentar historia de obesidad o sobrepeso previo, as&iacute; como un perfil de personalidad con elevada evitaci&oacute;n del da&ntilde;o y baja autodirecci&oacute;n eran un factor de riesgo para desarrollar un TCA.</font></p>  	    <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>  	    <p align="justify"><font face="verdana" size="2"><b>Agradecimientos:</b> El presente proyecto ha sido parcialmente financiado por la Uni&oacute;n Europea (Framework&#45;V Multicenter Research Grant, QCK1&#45;1999&#45;916) y el Fondo de Investigaci&oacute;n Sanitario&#45;FIS (PI081573; PI081714). El CIBER de Fisiopatolog&iacute;a de la Obesidad y la Nutrici&oacute;n (CIBERobn) y el CIBER Salud mental (CIBERSAM) son iniciativas del ISCIII. Este trabajo forma parte de la tesis de Zaida Ag&uuml;era en la Universidad de Barcelona.</font></p>  	    <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>  	    <p align="justify"><font face="verdana" size="2"><b>Referencias</b></font></p>  	    <!-- ref --><p align="justify"><font face="verdana" size="2">Alvarez&#45;Moya, E. M., Jimenez&#45;Murcia, S., Granero, R., Vallejo, J., Krug, I., Bulik, C. M., et al. (2007). Comparison of personality risk factors in bulimia nervosa and pathological gambling. <i>Comprehensive Psychia</i><i>try, 48</i>(5), 452&#45;457.    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=8880048&pid=S2007-1523201100010000600001&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --></font></p>  	    <!-- ref --><p align="justify"><font face="verdana" size="2">Amianto, F., Abbate&#45;Daga, G., Morando, S., Sobrero, C., &amp; Fassino, S. (2011). 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