Table 7.

The factor structure of the twelve-item General Health Questionnaire (GHQ-12)

Model	Χ2	df	p	Χ2/df	NFI	CFI	RMSEA (90% CL)	ECVI (90% CL)
1. Three-dimensional	249.10	51	0.000	4.88	0.821	0.849	0.076	0.485
2. One-dimensional	322.78	54	0.000	5.98	0.785	0.795	0.086	0.585
3. Two-dimensional	298.90	53	0.000	5.64	0.785	0.813	0.083	0.552
4. One-dimensional with correlated error terms	212.60	39	0.000	5.45	0.847	0.868	0.081	0.466

NFI Normed Fit Index, CFI Comparative Fit Index, RMSEA Root Mean Square Error of Approximation, ECVI Expected Cross Validation Index