Table 1.

Fitting models of first-order factors and second-order sub-factors in 493 participants.

Factor model	χ2/df	Goodness of fit index	Adjusted goodness of fit index	Tucker-Lewis index	Comparative fit index	Root mean square error of approximation
First-order: all four factors	2.25	0.64	0.63	0.81	0.82	0.05
Second-order: four sub-factors of Factor 1	1.86	0.93	0.91	0.97	0.97	0.04
Second-order: two sub-factors of Factor 2	2.25	0.95	0.93	0.97	0.97	0.05
Second-order: three sub-factors of Factor 3	1.85	0.97	0.95	0.98	0.99	0.04
Second-order: all ten sub-factors	1.69	0.85	0.83	0.93	0.94	0.04