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Psychometric validation of the State Scale of Dissociation (SSD)
Author(s) -
Krüger Christa,
Mace Chris J.
Publication year - 2002
Publication title -
psychology and psychotherapy: theory, research and practice
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.102
H-Index - 62
eISSN - 2044-8341
pISSN - 1476-0835
DOI - 10.1348/147608302169535
Subject(s) - derealization , depersonalization , dissociative , psychology , dissociative disorders , discriminant validity , dissociation (chemistry) , construct validity , clinical psychology , dissociative identity disorder , dissociative experiences scale , psychiatry , psychometrics , concurrent validity , convergent validity , internal consistency , psychosis , burnout , chemistry , schizotypy , emotional exhaustion
Although dissociative phenomena are often transient features of mental states, existing measures of dissociation are designed to measure enduring traits. A new present‐state self‐report measure, sensitive to changes in dissociative states, was therefore developed and psychometrically validated. Fifty‐six items were formulated to measure state features, and sorted according to seven subscales: derealization, depersonalization, identity confusion, identity alteration, conversion, amnesia and hypermnesia. The State Scale of Dissociation (SSD) was administered with other psychiatric scales (DES, BDI, BAI, SCI‐PANSS)to 130 participants with DSM‐IV major depressive disorder schizophrenia, alcohol withdrawal, dissociative disorders and controls. In these sample populations, the SSD was demonstrated as a valid and reliable measure of changes in and the severity of dissociative states. Discriminant validity, content, concurrent, predictive, internal criterion‐related, internal construct and convergent validities, and internal consistency and split‐half reliability were confirmed statistically. Clinical observations of dissociative states , and their comorbidity with symptoms of depression and psychotic illness, were confirmed empirically. The SSD, an acceptable, valid and reliable scale measuring state features of dissociation at the time of completion, was obtained. This is a prerequisite for further investigation of correlations between changes in dissociative states and concurrent physiological parameters.