Table 3:

Results of analyzing the validity of each scale

Index	Reference value	IADDS	SASS-CS	ULS-8 Loneliness Scale
χ2/df	< 3	1.639	1.763	1.853
GFI	> 0.90	0.944	0.931	0.921
CFI	> 0.90	0.980	0.952	0.932
NFI	> 0.90	0.952	0.932	0.922
RMSEA	< 0.080	0.079	0.062	0.067
IFI	> 0.90	0.982	0.952	0.932
AGFI	> 0.80	0.880	0.875	0.860