“…Nevertheless, other factor solutions were proposed in a few studies, such as a modified single-factor model(with residual correlations among some items) [ 4 ], a two-factor model (with an item ("Everything was an effort") loading on the second factor) [ 5 ], a two-factor solution( with three items ("Nervous", "Restless or fidgety", and "Everything was an effort") on the anxiety factor, and another three items ("Hopeless", "Depressed", and "Worthless") on the depression factor) [ 20 ], a two-factor model (with four items formed the depression factor, and the rest two items ("Nervous" and "Restless or fidgety") formed the anxiety factor) and a second-order two-factor model [ 21 , 22 ]. In a more recent study, we derived a two-factor model with exploratory factor analysis (EFA), with three items("Depressed", "Nervous", and "Restless or fidgety") loaded on the anxiety factor and the other three items("Hopeless", "Everything was an effort ", and "Worthless ") on the depression factor[ 3 ]. We also compared it with previous models using confirmatory factor analysis (CFA) and found that only this model was acceptable regarding model-data fit indexes.…”