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Psicothema was founded in Asturias (northern Spain) in 1989, and is published jointly by the Psychology Faculty of the University of Oviedo and the Psychological Association of the Principality of Asturias (Colegio Oficial de Psicología del Principado de Asturias).
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Psicothema, 2008. Vol. Vol. 20 (nº 4). 844-850




Psychometric properties of the Brief Symptoms Inventory-18 (bsi-18) in a Spanish sample of outpatients with psychiatric disorders

Yolanda Andreu, María José Galdón, Estrella Dura, Maite Ferrando, Sergio Murgui, Amparo García and Elena Ibáñez

Universidad de Valencia

This study analyzes the psychometric and structural properties of the BSI-18 in a sample of Spanish outpatients with psychiatric disorders (N= 200), with three basic objectives: (a) to study the structural validity of the instrument; (b) to analyse reliability (internal consistency and test-retest stability) and validity (convergent and discriminant) of the instrument, and (c) to evaluate sensitivity to change in a therapeutic context. Using confirmatory factor analysis, two models were tested: the three-dimensional theoretical model proposed by its authors, and the empirical four-factor model obtained by the same authors through exploratory factor analysis. Our results showed that the best structure was a four-dimensional model, with the General Distress index and Somatization, Depression, General Anxiety and Panic scores. These four scales showed good internal consistency, test-retest reliability, validity and sensitivity to therapeutic change. The BSI-18 has been shown to be a reliable and useful tool for psychiatric assessment of patients, with the added advantage provided by its simplicity and ease of application.

Propiedades psicométricas del Brief Symptoms Inventory 18 (BSI-18) en una muestra española de pacientes ambulatorios con trastornos psiquiátricos. Este trabajo analiza las propiedades psicométricas y estructurales del BSI-18 en una muestra española de pacientes ambulatorios con trastornos psiquiátricos (N= 200) con tres objetivos: (i) estudiar la validez estructural del mismo; (ii) analizar su fiabilidad (consistencia interna y estabilidad test-retest) y validez (convergente y discriminante); y (iii) evaluar su sensibilidad al cambio en el contexto terapéutico. Utilizando análisis factorial confirmatorio, se pusieron a prueba dos modelos estructurales: el modelo trifactorial propuesto teóricamente por los autores del instrumento, y el modelo empírico obtenido por los mismos a través de un análisis factorial exploratorio que arrojó cuatro factores. Nuestros resultados mostraron que la estructura óptima era un modelo de cuatro dimensiones que diferencia entre Somatización, Depresión, Ansiedad general y Pánico. Estas cuatro escalas mostraron índices adecuados de consistencia interna, fiabilidad test-retest, validez convergente y discriminante, y sensibilidad al cambio terapéutico. El BSI-18 ha mostrado ser un instrumento fiable y válido para la evaluación de pacientes con trastornos psiquiátricos, con la ventaja adicional de su simplicidad y brevedad de aplicación.

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Impact factor 2022:  JCR WOS 2022:  FI = 3.6 (Q2);  JCI = 1.21 (Q1) / SCOPUS 2023:  SJR = 1.07;  CiteScore = 6.4 (Q1)