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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 Psicólogos del Principado de Asturias).
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Psychometric Properties of the Spanish Version of the Pain Anxiety Symptoms Scale-20 (PASS-20-SV)

Alicia E. López-Martínez1,2, Rosa Esteve1,2, Gema T. Ruiz-Párraga1,2, Carmen Rueda-Serrano1, Elena R. Serrano-Ibáñez3,2, and Carmen Ramírez-Maestre1,2

1 Universidad de Málaga,
2 Instituto de Investigaciones Biomédicas de Málaga (IBIMA), and
3 Universidad Isabel I (Burgos)

Background: The PASS-20 is a general measure of pain-related anxiety and fear. The aim of the present study was to adapt the questionnaire for use in Spanish-speaking populations. Methods: Sample 1 comprised 216 individuals with chronic spinal pain (114 women and 102 men); sample 2 comprised 85 individuals with acute spinal pain (62 women and 23 men). The dimensionality of the PASS-20-SV items was evaluated using Exploratory Factor Analysis and an optimal implementation of Parallel Analysis (robust maximum likelihood).  Data from sample 1 was used to analyse internal consistency and convergent validity. Estimated test-retest stability and predictive validity were based on data from the sample 2 participants, who completed the first administration (T1) and a second administration (T2, 6 months later). Results: The PASS-20-SV comprises two factors: pain-related anxiety and apprehension, and pain-related fear and avoidance. It has good to excellent reliability and adequate test-retest stability. The results support its convergent and predictive validity. Conclusions: The Spanish Version of the PASS-20 is a valid, reliable measure of pain-related anxiety and pain-related fear in Spanish-speaking patients.

Propiedades Psicométricas de la Versión Española de la Pain Anxiety Symptoms Scale-20 (PASS-20-SV). Antecedentes: el PASS-20 es una medida general de la ansiedad y el miedo relacionados con el dolor. El objetivo del presente estudio fue adaptar el cuestionario para su uso en población española. Método: la muestra 1 incluyó 216 personas con dolor crónico de espalda (114 mujeres y 102 hombres); la muestra 2 comprendió 85 personas con dolor agudo de espalda (62 mujeres y 23 hombres). La estructura factorial del PASS-20-SV se evaluó mediante un análisis factorial exploratorio y un análisis paralelo (máxima verosimilitud).  Los datos de la muestra 1 se utilizaron para analizar la fiabilidad y la validez convergente. La estabilidad estimada de la prueba y la validez predictiva se basaron en los datos de los participantes de la muestra 2, que completaron el instrumento en dos momentos (T1 y T2, 6 meses después). Resultados: la versión española del PASS-20 se compone de dos factores: ansiedad y aprehensión al dolor, y miedo y evitación del dolor, con buena consistencia interna y adecuada estabilidad. Los resultados apoyan la validez convergente y predictiva del instrumento. Conclusiones: la versión española del PASS-20 es una medida válida y fiable para evaluar la ansiedad y el miedo al dolor.

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