Table 5.

Confirmatory Factor Analysis of the GHQ - 12

	12 item	12 item*	Model1	Model2	GHQ-6	GHQ-8
χ2	1608.7	565.55	1018.5	874.71	202.98	265.51
Df	54	39	53	51	9	19
P	0.0001	0.0001	0.0001	0.0001	0.001	0.0001
RMSEA (90% CI)	0.10 (0.097 - 0.11)	0.069 (0.064 - 0.075)	0.081 (0.076 - 0.085)	0.076 (0.072 - 0.08)	0.086 (0.076 - 0.096)	0.068 (0.061 - 0.075)
ECVI (90% CI)	0.60 (0.55 - 0.65)	0.24 (0.21 - 0.27)	0.39 (0.35 - 0.43)	0.34 (0.31 - 0.38)	0.081 (0.067 - 0.099)	0.11 (0.095-0.13)
IFI	0.89	0.96	0.93	0.89	0.97	0.97
CFI	0.89	0.96	0.93	0.94	0.97	0.97

* Correlated error term (Hankins, 2008)

Model 1 Andrich & van Schoubroeck (1989) Two-factor model

Model 2 Graetz (1991) Three-factor model