Turkish Adaptation of the Dimensional Clinical Personality Inventory-Schizoid Personality Disorder: Validity and Reliability Study

Abstract

Objective: Criticisms and limitations of the categorical approach in the Diagnostic and Statistical Manual of Mental Disorders, Fifth Edition (DSM-5) are discussed. In recent years, it has been suggested that an alternative approach, such as the dimensional model, is more advantageous. The Hierarchical Taxonomy of Psychopathology (HiTOP), which offers a dimensional-based framework, is presented as a new perspective. The study aimed to adapt the Dimensional Clinical Personality Inventory-Schizoid Personality Disorder (IDCP-SZPD), which was developed according to the HiTOP perspective and assesses schizoid personality disorder with a dimensional approach, into Turkish, and to examine its validity and reliability. Method: The Perth Alexithymia Questionnaire, Interpersonal Sensitivity Scale, Interpersonal Reactivity Index, The Interpersonal Attachment Styles Scale, Coolidge Axis II Inventory Plus Turkish Short Form, and Structured Clinical Interview for the Diagnostic and Statistical Manual of Mental Disorders, Third Edition, Revised (DSM-III-R) Personality Questionnaire were used for convergent validity analyses. Convergent validity, exploratory, and confirmatory factor analyses were conducted for validity, while Cronbach’s Alpha and test-retest analyses were used for reliability. Results: The factor analysis determined that the 10th, 17th, 18th, and 23rd items should be removed from the scale, and the scale showed a five-factor structure. According to the reliability analysis, Cronbach’s alpha value was found to be 0.91 for the total scale and between 0.71 and 0.91 for the subscales. It was determined that the item-total item correlations of all items on the scale were above 0.30. Conclusion: Based on the findings, it is evident that the Turkish adaptation of the IDCP-SZPD has strong psychometric properties.