Model comparison between unidimensional, five-dimensional and bifactor models.

*p△χ2 and △df represent model fit comparison between unidimensional, five-dimensional, and bifactor models.*pΔχ² 与 Δdf 代表单维模型（unidimensional model）、五维模型（five-dimensional model）与双因子模型（bifactor model）之间的模型拟合比较。