Reliability and validity of a Japanese version of the Cambridge depersonalization scale as a screening instrument for depersonalization disorder

Abstract

Aims:The Cambridge Depersonalization Scale (CDS) is an instrument that has obtained reliability and validity in some countries for use in detecting depersonalization disorder under clinical conditions, but not yet in Japan under non-psychiatric conditions. The purposes of this study were to develop a Japanese version of the CDS (J-CDS) and to examine its reliability and validity as an instrument for screening depersonalization disorder under non-clinical conditions. Methods: The CDS was translated from English intoJapanese and then back-translated into English by a native English-speaking American. After making the J-CDS, we examined its reliability and validity. Questionnaires that were composed of J-CDS, the Dissociative Experience Scale (DES), the Zung self-rating scale and the Maudsley Obsessional-Compulsive Inventory were administrated to 59 participants (12 patients with depersonalization disorder, 11 individuals who had recovered from depersonalization and 36 healthy controls).Results: Cronbach's alpha and split-half reliability were 0.94 and 0.93, respectively. The J-CDS score in the depersonalization group was significantly higher than in the healthy control group. The J-CDS score was significantly correlated with scores of total DES, and DES-depersonalization. The best compromise between the true positive and false negative rate was at a cut-off point of 60, yielding a sensitivity of 1.00 and a specificity of 0.96. Conclusions:In this study, J-CDS showed good reliability and validity. The best cut-off point, when we use this for distinguishing individuals with depersonalization disorder from individuals without psychiatric disorders, is 60 points.

Rastreamento do Transtorno de Despersonalização/Desrealização em Estudantes de Medicina de uma Universidade Federal no Brasil

“…Soma-se a isso o tema de natureza pessoal e íntima abordado nesta pesquisa. Embora a tradução para o português do questionário que utilizamos neste estudo (CDS-BR) ainda careça de uma análise formal de validação transcultural para assegurar sua estabilidade, a Cambridge Depersonalization Scale é uma ferramenta testada e validada transculturalmente em diversos países (CDS, CDS-J, CDS-IV, CDS9, CDS-VE) 9 , mantendo sua acurácia e confiabilidade em diversos países onde foi testada 7,10,14,15 . Entretanto, recomenda-se cautela na interpretação destes resultados.…”

Italian (cross cultural) adaptation and validation of the Cambridge Depersonalization Scale (CDS)

“…Validated CDS versions translated into German, Spanish and Japanese (Michal et al 2004; Molina Castillo et al 2006; Sugiura et al 2009) showed high internal consistency (Cronbach's alpha: 0.95, 0.94 and 0.94, respectively) and high correlations with DES DP/DR subscale (Spearman coefficient: 0.75, 0.60 and 0.65, respectively).…”

Editorial

“…Sugiura et al . showed the reliability and validity of the Japanese version of the Cambridge Depersonalization Scale (J‐CDS) and set its best cut‐off at 60, based on 59 participants (12 patients with depersonalization disorder, 11 individuals having recovered from depersonalization and 36 healthy controls) 2 . Nishi et al .…”

“…1 Sugiura et al showed the reliability and validity of the Japanese version of the Cambridge Depersonalization Scale (J-CDS) and set its best cut-off at 60, based on 59 participants (12 patients with depersonalization disorder, 11 individuals having recovered from depersonalization and 36 healthy controls). 2 Nishi et al reported that the score on the Japanese version of the Peritraumatic Distress Inventory (PDI) predicted subsequent post-traumatic stress disorder in survivors of severe motor vehicle accidents with sensitivity (77%) and specificity (82%) at a cutoff of 23. 3 Koyama et al reported the utility of the Japanese version of the Checklist for Autism in Toddlers (CHAT-J) for predicting pervasive developmental disorders (PDD) based on 52 two-year-old children with PDD and 48 two-year-old children without PDD.…”