| Objective : COVID-19 pandemic causes psychological problems such as stress. It is important to accurately identify the level of stress and establish efective intervention. The Impact of Event Scale-6 (IES-6) is widely used for post-trau‑ matic stress disorder (PTSD) screening by measuring the level of subjective stress, but there has been no research on its psychometric properties with individuals who experienced the COVID-19 pandemic. |
| Methods : A random sample of 600 participants were randomly selected from a COVID-19 survey database (n=6391). Rasch analysis was conducted to examine item ft, rating scale structure, construct validity, diferential item functioning (DIF), and precision of the IES-6. |
| Results : The principal component analysis of Rasch residuals (54.1% of the raw variance explained) and the average of residual correlations (average r=.19) supported the unidimensionality structure in the IES-6. The rating scale was suitable, and the item difculty hierarchy was logical. The item ft and the DIF contrast were acceptable, except for item 5. The IES-6’s person reliability was .76, which was also an acceptable level. |
| Conclusion : This study showed that the IES-6 has acceptable item-level psychometrics for screening the stress level in adults in the United States for individuals who have experienced the COVID-19 pandemic. The fndings suggested that the IES-6 would be useful for the rapid identifcation of the high-level stressand allow clinicians to quickly provide interventions for people with the COVID-19 related stress and their families. |