Table 2. Goodness-of-fit statistics and χ² difference tests for the two model comparisons (heterogeneity vs. homogeneity, MIMIC models I vs. II).

	χ 2	df	RMSEA	CFI	χ 2 diff	dfdiff	p
Test for heterogeneity
Model Ia	197.3	72	0.04	0.98
Model IIb	617.4	120	0.06	0.93	420.1	48	< 0.001
MIMIC models
Model Ic	868.5	199	0.05	0.94
Model IId	1041.5	218	0.05	0.93	173.0	19	< 0.001

df, degrees of freedom; RMSEA, root mean square error of approximation; CFI, comparative fit index; χ²_diff, χ² statistic of the χ² difference test; df_diff, degrees of freedom of the χ² difference test; p, p-value of the χ² difference test;

^aheterogeneity model;

^bhomogeneity model;

^c19 significant direct paths from risk factors to symptoms;

^dno direct paths from risk factors to symptoms.