Table 2. Comparison of DTS models among the total sample, individuals with a history of NSSI, and individuals without a history of NSSI.

	χ2	df	Δ χ2 (Δ df)	p Δ χ2	CFI	TLI	RMSEA	SRMR
Total sample (n = 531)
Baseline fit
Higher-order factor model	356.534	86	–	–	0.915	0.896	0.077	0.059
Lower-order factor model	312.991	82	43.543 (2)	<0.001	0.928	0.910	0.072	0.051
Baseline fit with appraisal item correlations
Higher-order factor model	280.973	84	–	–	0.938	0.923	0.066	0.055
Lower-order factor model	245.490	82	35.483 (2)	<0.001	0.949	0.934	0.061	.047
NSSI history (n = 215)
Baseline fit
Higher-order factor model	210.779	86	–		0.872	0.844	0.082	0.087
Lower-order factor model	181.950	84	28.829(2)	<0.001	0.899	0.874	0.074	0.071
Baseline fit with appraisal item correlations
Higher-order factor model	186.424	84	–	–	0.895	0.869	0.075	0.084
Lower-order factor model	159.979	82	26.45 (2)	<0.001	0.920	0.897	0.067	0.067
No NSSI history (n = 316)
Baseline fit
Higher-order factor model	200.891	86	–		0.923	0.906	0.065	0.053
Lower-order factor model	188.532	84	12.359 (2)	0.002	0.930	0.913	0.063	0.051
Baseline fit with appraisal item correlations
Higher-order factor model	153.183	84	–	–	0.954	0.942	0.051	0.049
Lower-order factor model	145.198	82	7.99 (2)	0.018	0.958	0.946	0.049	0.045