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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Validity and reliability of the Spanish version of the Somatoform Dissociation Questionnaire (SDQ-20)

Ana Isabel González-Vázquez1, Lucía del Río-Casanova2, Natalia Seijo-Ameneiros3, Paloma Cabaleiro-Fernández4, Teresa Seoane-Pillado5, Ania Justo-Alonso6 and Miguel Ángel Santed-Germán7

1 Complexo Hospitalario Universitario de A Coruña,
2 Clínica Assistens (A Coruña),
3 Centro de Psicología y Trauma (Ferrol),
4 Centro de Psicoterapia (Ourense),
5 Instituto de Investigación Biomédica de A Coruña (INIBIC),
6 Clínica Assistens (Vigo) and

Background: The Somatoform Dissociation Questionnaire (SDQ-20) is a self-reported questionnaire measuring somatoform dissociation. The aim of this study is to analyze the psychometric properties of the Spanish version of the SDQ-20 and its short version (SDQ-5). Methods: Validity and reliability were examined in a sample of 360 psychiatric outpatients: 38 dissociative (conversion) disorders, 30 dissociative (psychoform) disorders, and 292 patients suffering from other disorders. Dissociative disorders were diagnosed using the SCID-D and a specific interview for conversion disorders. Results: Subjects meeting criteria for any dissociative or conversion disorder scored significantly higher in the SDQ-20 (criterion validity). Somatoform dissociation, psychoform dissociation and early trauma were significantly correlated (construct validity). An alpha coefficient of .866 (reliability) and a test-retest correlation of 0.91 were obtained. The cut-off score maximizing sensitivity and specificity was 27.5 for psychoform dissociative disorders (sensitivity of 81.6% and specificity of 71.0%) and 29.5 for conversion disorders (81.6% and 71.0%). For the SDQ-5, the coefficient alpha was 0.561 and the selected cut-off score was 5.5 (sensitivity of 73.33% and specificity of 70.41%). Conclusions: The Spanish version of the SDQ-20 presents good psychometric properties while the SDQ-5 shows worse characteristics and its use with Spanish samples is not recommended.

Validez y fiabilidad  de la versión española del Somatoform Dissociation Questionnaire (SDQ-20). Antecedentes: SDQ-20 (Somatoform Dissociation Questionnaire) es un autoinforme  que mide la presencia de disociación somatomorfa. Se analizan las propiedades psicométricas de la versión española de la SDQ-20 y su versión abreviada (SDQ-5). Método: su validez y fiabilidad han sido examinadas en una muestra de 360 pacientes: 38  trastorno disociativo (de conversión), 30 trastorno disociativo (psicomorfo) y 292 diagnosticados de otros trastornos.  El diagnóstico de trastorno disociativo se realizó mediante la SCID-D-TR y una entrevista específica para los trastornos conversivos. Resultados: los sujetos que cumplieron criterios de trastorno disociativo o conversivo puntuaron significativamente más alto en la SDQ-20 (criterio de validez). La disociación psicomorfa y somatomorfa y el trauma temprano se correlacionaron significativamente (validez del constructo). Se obtuvieron un coeficiente alpha de  0.866 (fiabilidad) y una correlación test-retest de 0,91. El punto de corte para los trastornos disociativos fue 27,5 (sensibilidad 81,6% y especificidad 71%) y 29,5 para los trastornos conversivos (81,6% y 71%). En la SDQ-5 se obtuvo un coeficiente alpha de 0,561 y un punto de corte de  5,5 (sensibilidad 73,33% y especificidad 70,41%). Conclusiones: la versión española de la SDQ-20  presenta buenas propiedades psicométricas. La SDQ-5 muestra peores características y su uso en muestras españolas no se recomienda.


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