TABLE 3.

Assessment of dimensional invariance of the PHQ-9 and GAD-7 across demographic subgroups, status of diabetes and over time.

		PHQ-9								GAD-7
		N	χ 2	df	p	CFI	TLI	RMSEA	SRMR	N	χ 2	df	p	CFI	TLI	RMSEA	SRMR
Gender	Female	553	65.737	26	0.000	0.940	0.917	0.067	0.044	554	33.022	12	0.001	0.978	0.962	0.073	0.035
	Male	654	57.140	26	0.000	0.949	0.929	0.059	0.041	651	14.268	12	0.284	0.997	0.995	0.024	0.022
Age	30–40	326	66.215	26	0.000	0.878	0.831	0.089	0.060	324	17.777	12	0.123	0.988	0.979	0.049	0.032
	41–50	493	49.860	26	0.003	0.956	0.939	0.059	0.043	495	26.334	12	0.010	0.984	0.973	0.062	0.033
	51–60	388	61.913	26	0.000	0.940	0.917	0.072	0.046	386	19.646	12	0.074	0.987	0.977	0.057	0.026
Education	Primary	305	57.584	26	0.000	0.930	0.903	0.083	0.052	305	25.109	12	0.014	0.979	0.964	0.076	0.029
	Secondary	619	56.576	26	0.000	0.952	0.934	0.058	0.042	617	15.282	12	0.226	0.996	0.993	0.028	0.022
	Higher	283	39.294	26	0.046	0.930	0.904	0.049	0.052	283	26.647	12	0.009	0.966	0.940	0.086	0.047
T2D-Status	At risk	1006	85.341	26	0.000	0.947	0.926	0.065	0.040	1003	25.562	12	0.012	0.991	0.984	0.046	0.023
	T2D	201	40.088	26	0.038	0.944	0.922	0.061	0.051	202	14.962	12	0.244	0.989	0.981	0.050	0.039
Time	T0	1006	85.341	26	0.000	0.947	0.926	0.065	0.040	1003	25.562	12	0.012	0.991	0.984	0.046	0.023
	T1	982	39.152	26	0.047	0.984	0.978	0.033	0.031	981	21.062	12	0.049	0.993	0.988	0.039	0.022
	T2	963	52.996	26	0.001	0.974	0.965	0.046	0.038	963	36.948	12	0.000	0.978	0.961	0.067	0.029

df, degrees of freedom; CFI, comparative fit index; TLI, Tucker–Lewis index; RMSEA, root-mean-square error of approximation; SRMR, standardized root mean square residual: T2D, type two diabetes.