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: A valid and reliable assessment of social anxiety is a subject of practical relevance in the field of clinical research and diagnosis. In the present study, psychometric properties of the Spanish version of the Social Phobia and Anxiety Inventory (SPAI-B) using the item response theory (IRT) were assessed. Although the inventory is widely used in several countries and cultural contexts, validation studies of the scale had not been performed yet from the Rasch model perspective in Argentinean and Spanish populations. The results indicate that the tool allows a unidimensional assessment of social anxiety with a pertinent categorization of the response scale. Furthermore, the data show that the level of severity of the items is adequate and allows the detection of clinical population. It was reported on the items with a differential functioning between gender and nationality, and the clinical implications of such differences were discussed.  Resumen :  Analisis mediante el modelo de Rasch de la Version Breve del Inventario de Ansiedad y Fobia Social (SPAI-B) en muestras argentinas y espanolas.  La evaluacion valida y fiable de la ansiedad social es un aspecto de suma importancia practica en contextos de investigacion y diagnostico clinico. Por ello, en el presente estudio se evaluaron las propiedades psicometricas de la version breve para hispanohablantes del Social Phobia and Anxiety Inventory (SPAI-B) a partir de la teoria de respuesta al item. Si bien la escala es ampliamente utilizada en diversos paises, contextos sociales y culturales, hasta ahora no se habian llevado a cabo estudios de validacion de la escala desde el modelo de Rasch en poblacion espanola y argentina. Los resultados evidencian que el instrumento permite una evaluacion unidimensional de la ansiedad social con una categorizacion pertinente de la escala de respuesta. Asimismo, los datos muestran que el nivel de severidad de los items es adecuado y permite la deteccion de poblacion clinica. Por ultimo, se informa sobre los items que tienen funcionamiento diferencial entre sexo y nacionalidad, y se discuten las implicaciones clinicas de estas diferencias culturales.

Rasch Model analysis of the Brief Version of the Social Phobia and Anxiety Inventory (SPAI- B) in Argentinean and Spanish samples.