Skip to main content

Psychometric properties of the Psy-flex scale: A validation study in a community sample in Korea (Pages 70-79)

Journal of Contextual Behavioral Science (JCBS)
Volume 30, October 2023, Pages 70-79


Duckhyun Jo, Byeori Seong, Eunjoo Yang


This study examined the psychometric properties of the recently developed six-item Psy-Flex among community samples in Korea. Using a cross-sectional design, data were collected from 1059 participants. Three bilingual experts translated the scale to ensure content validity. Factor analysis was employed to confirm the factor structure, and a polytomous item response theory model was used to examine the individual items and entire scale. The theory-based single-factor structure was confirmed using a Korean community sample, and measurement invariances were found across sex and age groups. In addition, the scale showed a moderate relationship with established measures of interest. Furthermore, item and categorical functioning were investigated using the polytomous Item Response Theory (IRT) model (i.e., the Generalized Partial Credit Model [GPCM]), identifying well-functioning (e.g., items 4, 5, and 6) and suboptimal (e.g., item 2) items. Additionally, the results suggest that the participants might not be able to meaningfully differentiate the original five-response categories. To the best of our knowledge, this is the first attempt to validate the Psy-Flex in Korea. We believe that the findings are of considerable value in facilitating our understanding of the scale and, more broadly, the construct of psychological flexibility.

This article is restricted to ACBS members. Please join or login with your ACBS account.