Table 2.

Fit index for unidimensionality assumption

	RSF:8	ISF:8
PCA
% of variance explained by first PC	32.2 %	30.9 %
Ratio of first PC to second PC	2.11	2.22
Number of first PC factor loading >0.33	7 out of 8	8 out of 8
CFA
RMSEA	0.088	0.102
NFI	0.90	0.84
CFI	0.91	0.85
p-value (Chi-square test)	<0.001	<0.001
GFI	0.96	0.94
Standardized RMSR	0.041	0.043