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Title: Psychometric characteristics of the Somatoform Dissociation Questionnaire: A replication study
Authors: Nijenhuis, ERS ×
Spinhoven, P
van Dyck, R
van der Hart, O
Vanderlinden, Johan #
Issue Date: Jan-1998
Publisher: Karger
Series Title: Psychotherapy and psychosomatics vol:67 issue:1 pages:17-23
Abstract: Background: The present study aimed to replicate the results of previous studies concerning the development of two versions of the Somatoform Dissociation Questionnaire. The SDQ-20 evaluates the severity of somatoform dissociative phenomena, and the SDQ-5 is a dissociative disorders screening instrument. Methods: Thirty-one patients with dissociative disorders and 45 consecutive psychiatric outpatients with other DSM-IV diagnoses completed the SDQ-20 and SDQ-5 as well as the Dissociation Questionnaire which measures psychological dissociation. Results: Mokken scale analysis showed that the items of the SDQ-20 are strongly scalable on a latent unidimensional scale. Internal consistency was high. The SDQ-20 convergent validity was supported by high intercorrelations with the DIS-Q. Dissociative patients obtained significantly higher scores than comparison patients. Patients with dissociative identity disorder scored significantly higher compared to patients with dissociative disorder nos. Sensitivity (94%) and specificity (98%) of the SDQ-5 were very satisfactory, as were, at an estimated prevalence rate of dissociative disorders of 10% among psychiatric patients, positive predictive value (84%) and negative predictive value (99%). Conclusions: All results replicated the first findings, and therefore corroborate the conclusion that the SDQ-20 and SDQ-5 are instruments of sound psychometric quality, and that somatoform dissociative phenomena are core symptoms of complex dissociative disorders.
URI: 
ISSN: 0033-3190
Publication status: published
KU Leuven publication type: IT
Appears in Collections:Onderzoeksgroep psychodiagnostiek en psychopathologie (-)
× corresponding author
# (joint) last author

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