Validation study of the Korean version of the COVID-19 Anxiety Scale (CAS-7) and psychometric comparison of different rating scales

Abstract

We aimed to explore the validity and reliability of the Korean version of the COVID-19 Anxiety Scale (CAS-7) among the general population and compare the psychometric properties of the CAS-7 with major rating scales for viral anxiety according to the generalized anxiety disorder-7 (GAD-7) during the coronavirus disease 2019 (COVID-19) pandemic. This anonymous online survey was conducted among the general population in South Korea during November 9–15, 2021, and 400 people participated. The survey form included demographic characteristics and rating scales, including the CAS-7, Stress and Anxiety to Viral Epidemics-6 items (SAVE-6), Coronavirus Anxiety Scale (CAS), Fear of COVID-19 scale (FCV-19S), and GAD-7. The single-factor structure of CAS-7 showed good fits for the model and convergent validity with other viral anxiety scales. When comparing psychometric properties, the CAS-7 and SAVE-6 scales were more sensitive than CAS, which was the most discriminating as well as the most difficult. CAS, FCV-19S, and GAD-7 provided more information and were more efficient than CAS-7 and SAVE-6. The Korean version of the CAS-7 is a valid and reliable rating scale for measuring viral anxiety. The viral anxiety rating scale can be applied depending on the objective of assessment in this pandemic.