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class="elsevierStyleTextfn">Editorial</span>" "titulo" => "Relevance of Controling for Confounding in Observational Studies" "tieneTextoCompleto" => true "paginas" => array:1 [ 0 => array:1 [ "paginaInicial" => "117" ] ] "autores" => array:1 [ 0 => array:4 [ "autoresLista" => "Esther Barreiro, Xavier Muñoz, Francisco-Javier González-Barcala, Víctor Bustamante, José Ignacio de Granda-Orive" "autores" => array:5 [ 0 => array:4 [ "nombre" => "Esther" "apellidos" => "Barreiro" "email" => array:1 [ 0 => "ebarreiro@imim.es" ] "referencia" => array:3 [ 0 => array:2 [ "etiqueta" => "<span class="elsevierStyleSup">a</span>" "identificador" => "aff0005" ] 1 => array:2 [ "etiqueta" => "<span class="elsevierStyleSup">b</span>" "identificador" => "aff0010" ] 2 => array:2 [ "etiqueta" => "<span class="elsevierStyleSup">*</span>" "identificador" => "cor0005" ] ] ] 1 => array:3 [ "nombre" => "Xavier" "apellidos" => "Muñoz" "referencia" => array:2 [ 0 => array:2 [ "etiqueta" => "<span 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in Chronic Respiratory Diseases and Lung Cancer, IMIM-Hospital del Mar, Pompeu Fabra University, Barcelona, Spain" "etiqueta" => "a" "identificador" => "aff0005" ] 1 => array:3 [ "entidad" => "Centro de Investigación en Red de Enfermedades Respiratorias (CIBERES), Instituto de Salud Carlos III (ISCIII), Barcelona, Spain" "etiqueta" => "b" "identificador" => "aff0010" ] 2 => array:3 [ "entidad" => "Servicio de Neumología, Hospital Vall d’Hebron Barcelona, Spain" "etiqueta" => "c" "identificador" => "aff0015" ] 3 => array:3 [ "entidad" => "Pulmonology Department and Department of Medicine, Hospital Clinico Universitario, Universidad de Santiago de Compostela, Santiago de Compostela, Spain" "etiqueta" => "d" "identificador" => "aff0020" ] 4 => array:3 [ "entidad" => "Servicio de Neumología, Hospital Universitario Basurto, Bilbao, Osakidetza, Departamento de Medicina, Universidad del País Vasco, Spain" "etiqueta" => "e" "identificador" => "aff0025" ] 5 => array:3 [ "entidad" => "Servicio de Neumología, Hospital Universitario 12 de Octubre, Universidad Complutense, Madrid, Spain" "etiqueta" => "f" "identificador" => "aff0030" ] ] "correspondencia" => array:1 [ 0 => array:3 [ "identificador" => "cor0005" "etiqueta" => "⁎" "correspondencia" => "Corresponding author." ] ] ] ] "titulosAlternativos" => array:1 [ "es" => array:1 [ "titulo" => "La importancia de controlar los factores de confusión en los estudios observacionales" ] ] "textoCompleto" => "<span class="elsevierStyleSections"><p id="par0005" class="elsevierStylePara elsevierViewall">In the Annals of the American Thoracic Society (<span class="elsevierStyleItalic">Ann Am Thorac Soc</span>) Journal an article on the control of confounding and reporting of results in causal inference studies has been recently published.<a class="elsevierStyleCrossRef" href="#bib0030"><span class="elsevierStyleSup">1</span></a> This publication was the result of the need of establishing a guidance document as viewed by the 47 editors of 35 respiratory, sleep, and critical care journals who participated in the publication of the article.<a class="elsevierStyleCrossRef" href="#bib0030"><span class="elsevierStyleSup">1</span></a> The objective of the current editorial is to provide a brief outline on the most relevant issues analyzed in that article.<a class="elsevierStyleCrossRef" href="#bib0030"><span class="elsevierStyleSup">1</span></a> We expect that this editorial will be informative for researchers, authors, and peer-reviewers on the most relevant features to be taken into consideration at the time of designing and reporting results in observational studies.</p><p id="par0010" class="elsevierStylePara elsevierViewall">The relevance of causal inference relies on the fact that associations can be made to establish the causal effect of a given exposure on an outcome.<a class="elsevierStyleCrossRef" href="#bib0030"><span class="elsevierStyleSup">1</span></a> Causal inference is commonly used to answer etiologic questions in a study. These are relevant investigations as they help elucidate clinical problems. However, caution must be taken when designing these studies as confounding, an unclear hypothesis, and selection biases may interfere with the study outcomes, which may jeopardize interpretation of the results.</p><p id="par0015" class="elsevierStylePara elsevierViewall">A confounder has been classically defined as a third variable that is associated with the target exposure, is a cause of the outcome of interest, and is not located in the causal pathway between the exposure and the outcome.<a class="elsevierStyleCrossRef" href="#bib0035"><span class="elsevierStyleSup">2</span></a> Despite that this classical definition of a confounder has been accepted in the guidance document,<a class="elsevierStyleCrossRef" href="#bib0030"><span class="elsevierStyleSup">1</span></a> causal models are recommended with the aim to identify confounders at the time of designing observational studies.<a class="elsevierStyleCrossRefs" href="#bib0035"><span class="elsevierStyleSup">2–4</span></a> Examples of graphs representing causal models are provided in the guidance document for those interested in learning more about them.<a class="elsevierStyleCrossRef" href="#bib0030"><span class="elsevierStyleSup">1</span></a></p><p id="par0020" class="elsevierStylePara elsevierViewall">In the article,<a class="elsevierStyleCrossRef" href="#bib0030"><span class="elsevierStyleSup">1</span></a> reference to several approaches that authors tend to do in order to control for confounding has been made. As such it has been sufficiently argued that variable selection methods do not help control for confounding as they may ignore the underlying cause inherent to the study hypothesis.<a class="elsevierStyleCrossRef" href="#bib0030"><span class="elsevierStyleSup">1</span></a> Furthermore, emphasis has also been made on avoiding interpretation of causal inference on the basis of P value, since it does not provide any information on the magnitude, direction or clinical relevance of the associations between variables.<a class="elsevierStyleCrossRef" href="#bib0030"><span class="elsevierStyleSup">1</span></a></p><p id="par0025" class="elsevierStylePara elsevierViewall">In summary, in the guidance document recently published<a class="elsevierStyleCrossRef" href="#bib0030"><span class="elsevierStyleSup">1</span></a> it is recommended that observational (cohort, cross-sectional, and case-control) studies adhere to the STROBE (Strengthening the Reporting of Observational Studies in Epidemiology) statement, especially at the time of presenting the results in tabular form.<a class="elsevierStyleCrossRef" href="#bib0050"><span class="elsevierStyleSup">5</span></a> We, Editors of <span class="elsevierStyleItalic">Archivos de Bronconeumología</span>, agree with these recommendations and for the sake of clinical research will ensure that the results of the observational studies published in our journal adhere to them. We would also like to invite our authors to read the guidance document published in the January issue of the Ann Am Thorac Soc<span class="elsevierStyleSup">1</span>.</p></span>" "pdfFichero" => "main.pdf" "tienePdf" => true "bibliografia" => array:2 [ "titulo" => "References" "seccion" => array:1 [ 0 => array:2 [ "identificador" => "bibs0015" "bibliografiaReferencia" => array:5 [ 0 => array:3 [ "identificador" => "bib0030" "etiqueta" => "1" "referencia" => array:1 [ 0 => array:2 [ "contribucion" => array:1 [ 0 => array:2 [ "titulo" => "Control of confounding and reporting of results in causal inference studies. Guidance for authors from editors of respiratory, sleep, and critical care journals" "autores" => array:1 [ 0 => array:2 [ "etal" => true "autores" => array:6 [ 0 => "D.J. Lederer" 1 => "S.C. Bell" 2 => "R.D. Branson" 3 => "J.D. Chalmers" 4 => "R. Marshall" 5 => "D.M. 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