TABLE 5.

Invariance measurement analyses across diagnostic and age groups

	χ 2	df	AIC	BIC	RMSEA	SRMR	TLI	CFI	ΔCFI	Contrast	Δχ2	Δdf	p
Diagnosis (ADHD versus comparison) at age 25
1. Configural	385.30	152	10,607	11,057	0.086	0.06	0.911	0.936	–	–	–	–	–
2. Weak/Metric	395.33	162	10,597	11,009	0.084	0.06	0.908	0.929	0.007	2 versus 1	9.73	10	0.460
3. Strong/Scalar	426.50	172	10,608	10,982	0.085	0.06	0.914	0.929	0.000	3 versus 2	31.31	10	0.001
4. Strict	456.34	187	10,608	10,924	0.089	0.07	0.917	0.926	0.003	4 versus 3	24.14	15	0.063
Diagnosis (ADHD versus comparison) at age 30
1. Configural	348.64	152	13,473	13,944	0.073	0.04	0.950	0.964	–	–	–	–	–
2. Weak/Metric	353.97	162	13,458	13,890	0.069	0.08	0.954	0.964	<0.001	2 versus 1	5.90	10	0.820
3. Strong/Scalar	384.40	172	13,469	13,860	0.072	0.05	0.951	0.960	0.004	3 versus 2	29.32	10	0.001
4. Strict	462.61	187	13,517	13,848	0.079	0.06	0.941	0.947	0.013	4 versus 3	56.96	15	<0.001
Age (age 25 versus age 30)a
1. Configural	488.21	152	24,285	24,828	0.073	0.03	0.953	0.966	–	–	–	–	–
2. Weak/Metric	504.16	162	24,281	24,778	0.071	0.04	0.951	0.962	0.004	2 versus 1	16.06	10	0.100
3. Strong/Scalar	518.03	172	24,275	24,726	0.070	0.04	0.957	0.965	0.003	3 versus 2	13.83	10	0.180
4. Strict	534.06	187	24,261	24,643	0.067	0.04	0.961	0.965	<0.001	4 versus 3	15.00	15	0.640

Note: Measurement and structural invariance were analyzed using the first-order five-factor model.

Abbreviation: AIC, akaike information criterion; BIC, Bayesian information criterion; CFI, comparative fit index; CI, confidence interval; df, degree of freedom; RMSEA, root-mean-square error of approximation; SRMR, standardized root-mean-square residual; TLI, Tucker and Lewis index.

^aThe age 25 and age 30 data were used.