Turkish Adaptation of the Clinical Perfectionism Questionnaire: A Psychometric Evaluation in Clinical and Non-Clinical Samples.

Objective: The aim of this study was to evaluate the validity and reliability of the Turkish version of the Clinical Perfectionism Questionnaire (CPQ-TR) in clinical and non-clinical samples.

Method: This cross-sectional study included 63 clinical participants (Obsessive–Compulsive Disorder and Major Depressive Disorder) and 148 non-clinical participants. The scale adaptation was conducted using a translation–back translation procedure. Confirmatory factor analysis and internal consistency analyses were performed. Convergent and concurrent validity were examined through correlations with the Frost Multidimensional Perfectionism Scale (FMPS), Depression Anxiety Stress Scales–21 (DASS–21), and the Yale–Brown Obsessive Compulsive Scale (Y-BOCS).

Results: The internal consistency of the original 12-item CPQ-TR was found to be at a borderline level (Cronbach’s α=0.677); following the removal of Items 2 and 8, the Cronbach’s alpha coefficient of the resulting 10-item form increased to 0.76. Confirmatory factor analysis indicated limited support for a unidimensional factor structure. The CPQ-TR showed strong correlations with the FMPS (r=0.593) and moderate correlations with the Y-BOCS and DASS-21 (r=0.30–0.35). Participants with Obsessive–Compulsive Disorder had significantly higher CPQ scores compared to those with Major Depressive Disorder (p=0.018) and healthy controls (p <0.001).

Conclusion: The findings indicate that the 12-item CPQ-TR demonstrates borderline internal consistency but remains a valid instrument for assessing clinical perfectionism. The 10-item version appears to be a more psychometrically robust option for use in both research and clinical settings.