Exploratory Structural Equation Modeling Analysis of the Anxiety Sensitivity Index 3

Objective: Anxiety sensitivity is associated with the onset and progression of various emotional disorders. The Anxiety Sensitivity Index 3 (ASI-3) is a self-report scale for anxiety sensitivity. This study aims to resolve the ongoing controversy about the factorial structure of the ASI-3 using exploratory structural equation modeling (ESEM), a newly advanced technique. Methods: Confirmatory factor analysis (CFA), ESEM, bifactor-CFA, and bifactor-ESEM were used to investigate the factorial structure of the ASI-3. Three hundred Korean college students (female = 195, age: 21.74 +/- 2.34) filled out the ASI-3 and the Distress Intolerance Index. Results: The bifactor-ESEM model exhibited a model fit superior to the 4 alternative models. The general factor showed higher loadings and reliability and explained common variance than the 3 specific factors in the bifactor-ESEM model. Most items reflected the global factor, but 6 items (Items 2, 3, 5, 7, 10, and 17) from the specific factors had insufficient loadings. Moreover, the global factor of the ASI-3 was associated with distress intolerance scores, indicating adequate criterion-related validity. Conclusion: The factorial structure of the ASI-3 is best described as a bifactor-ESEM model for Korean college students. Additionally, the bifactor-ESEM model of the ASI-3 includes a strong global factor that explains a large amount of the observed variance in the ASI-3 items.