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.
Keywords: Clinical perfectionism, Clinical Perfectionism
Questionnaire, confirmatory factor analysis, clinical and non-clinical
samples, psychometrics, Turkish adaptation, validity and reliability