Adaptation and validation of the Swedish Five Factor Obsessive-Compulsive Inventory-Short Form in adults with and without eating disorder psychopathology

Background Obsessive–compulsive personality disorder (OCPD) traits are highly prevalent in eating disorder populations and linked to greater symptom severity and poorer treatment outcomes, yet no validated dimensional measure of these traits exists for use in Swedish-speaking populations or in eating disorder contexts. The Five-Factor Obsessive–Compulsive Inventory–Short Form (FFOCI-SF) is a brief, dimensional instrument designed to assess OCPD-related traits within the five-factor model framework. This study aimed to adapt and validate the Swedish FFOCI-SF and to examine its psychometric functioning in adults with and without elevated eating disorder symptoms. Methods Adults ( n = 395) completed the FFOCI-SF, NEO-PI-3, DIP-Q, and EDE-Q. Psychometric properties were examined using a multimethod approach integrating structural equation modeling and classical test theory. Results A revised 10-factor, 41-item model, reflecting the merger of three facets (C1–C3), demonstrated improved fit, clearer factor delineation, and acceptable-to-excellent internal consistencies (α = 0.66–0.93). Convergent and discriminant validity were supported, and facet intercorrelations broadly aligned with theoretical expectations. Full measurement invariance was not supported; however, reliability, facet intercorrelations, and associations with external criteria were broadly similar across groups. Preliminary group comparisons suggested higher scores across most facets among participants with elevated eating disorder symptoms. Conclusions The revised Swedish FFOCI-SF demonstrates promising psychometric properties and a clinically interpretable 10-facet structure as a dimensional measure of OCPD traits. The findings further provide initial evidence for its applicability in eating disorder samples.