Table 4.

IIP-32 eight-factor ESEM model invariance across clinical and non-clinical groups.

	χ2	df	CFI	TLI	RMSEA	SRMR	Model comparison	Δχ2	Δdf	ΔCFI
Non-clinical group	553.276	268	0.949	0.905	0.041	0.023	–	–	–	–
Clinical group	512.871	268	0.957	0.920	0.039	0.021	–	–	–	–
M0—configural invariance	1070.258	536	0.953	0.912	0.040	0.022	–	–	–	–
M1—metric invariance	1258.826	728	0.953	0.936	0.035	0.032	M1-M0	188.568***	192	0.000
M2—scalar invariance	1325.023	752	0.949	0.933	0.035	0.032	M2-M1	66.197***	24	0.004
M3—strict invariance	1858.295	784	0.905	0.879	0.047	0.046	M3-M2	533.272***	32	0.044
M3a—partial strict invariance	1449.867	770	0.940	0.922	0.038	0.037	M3a-M2	124.844***	18	0.009
M4—factor variances/covariances invariance	1637.092	806	0.926	0.909	0.041	0.059	M4-M3a	187.225***	36	0.014
M5—factor means invariance	1765.783	814	0.915	0.897	0.044	0.064	M5-M4	128.691***	8	0.011

df, degree of freedom; CFI, Comparative fit index; TLI, Tucker-Lewis Index; RMSEA, Root-mean-square error of approximation; SRMR, Standardized Root Mean Squared Residuals.

^***p < 0.001.