The Four-Dimensional Symptom Questionnaire (4DSQ) in the general population: scale structure, reliability, measurement invariance and normative data: a cross-sectional survey

Table 2 Confirmatory factor analysis: fit indices of the 4DSQ scales

4DSQ scale	Model	Chi-square	df	CFI	TLI	RMSEA	90 % CI of RMSEA
Distress	One-factor^a	2819.06	104	0.987	0.975	0.100	0.096 – 0.103
	One-factor with correlated residuals^a	763.11	101	0.994	0.993	0.051	0.047 – 0.053
	Bifactor^a	760.35	101	0.994	0.993	0.051	0.046 – 0.053
	Bifactor^b	765.19	116	0.996	0.996	0.045	0.043 – 0.049
Depression	One-factor^a	53.49	9	0.999	0.998	0.046	0.032 – 0.054
Depression	One-factor^b	72.96	14	0.999	0.999	0.040	0.031 – 0.049
Anxiety	One-factor^a	147.69	54	0.996	0.995	0.028	0.020 – 0.030
	One-factor with correlated residuals^a	121.65	53	0.997	0.996	0.025	0.017 – 0.027
	Bifactor^a	121.28	53	0.997	0.996	0.025	0.017 – 0.027
	Bifactor^b	283.45	64	0.995	0.995	0.035	0.031 – 0.040
Somatization	One-factor^a	1529.21	104	0.954	0.947	0.073	0.069 – 0.075
	One-factor with correlated residuals^a	370.12	97	0.991	0.988	0.034	0.029 – 0.036
	Bifactor^a	375.02	97	0.991	0.988	0.034	0.029 – 0.036
	Bifactor^b	535.96	116	0.989	0.989	0.036	0.034 – 0.040

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