TABLE 4.

Fit indices for measurement invariance.

Bifactor	WLSMVχ2	df	p	Diff test	CFI	TLI	RMSEA	ΔCFI
M0 – configural model	370.872∗	270	0.000	–	0.942	0.934	0.045	–
M1 – loading	360.336∗	268	0.001	–	0.947	0.939	0.043	0.005
M2 – threshold	382.764∗	302	0.001	0.0498	0.953	0.953	0.038	0.006

WLSMV = weighted least squares with mean and variance adjustment; df = degree of freedom; Diff test = difference test based on χ²; TLI = Tucker-Lewis index; CFI = comparative fit index; RMSEA = root mean square error of approximation; ΔCFI = change in comparative fit index relative to the preceding model; ^∗p < 0.05; chi-square difference test with WLSMV estimation is different from the conventional chi-square difference test.