Table 2.

Results of confirmatory factor analysis.

Model	${\mathit{\chi }}^2$	df	${\mathit{\chi }}^2/\mathit{d}\mathit{f}$	GFI	AGFI	TLI	CFI	NFI	RMSEA
Four factor	385.079	129	2.985	0.912	0.883	0.928	0.939	0.912	0.067
Three factor	592.126	132	4.486	0.871	0.832	0.873	0.891	0.864	0.088
Two factor	940.271	134	7.017	0.778	0.717	0.781	0.808	0.784	0.116
Single factor	1645.355	135	12.188	0.614	0.511	0.593	0.641	0.622	0.158

Notes: Four-factor model considers all four variables as independent factors; Three-factor model: combining home-based exercise with perceived behavioral control; Two-factor model: combining home-based exercise with perceived behavioral control, combining health consciousness with health life goal; Single-factor model: treats all variables as one dimension.