Table 6. Alternative model analysis results and fit statistics.

Model Description	χ2	DOF	RMSEA	RMSEA	90% CI	CFI	N
Sample 1, ABIS attention unidimensional model	19.63	4	0.050	0.029	0.073	0.994	1549
Sample 1, ABIS motor unidimensional model	7.01	1	0.062	0.025	0.109	0.999	1549
Sample 1, ABIS nonplanning unidimensional model	0.50	1	0.000	0.000	0.059	1.000	1549
ABIS unidimensional model (12×20; 13×30; 17×19 covariances)	1170.53	62	0.107	0.102	0.113	0.901	1549
Steinberg et al. 8 item unidemensional model (5×9 covariance)	424.46	19	0.117	0.108	0.127	0.900	1549
Spinella 15 item 3 factor model	1614.48	87	0.106	0.102	0.111	0.871	1549
Sample 1, Patton et al. 1995 three factor bi-factor model	3798.43	375	0.077	0.075	0.079	0.825	1549
Sample 1, ABIS three facto bi-factor model (no covariances)	515.25	52	0.076	0.070	0.082	0.958	1549

Note. DOF = degrees of freedom; RMSEA = root mean square error of approximation; CI = confidence interval; CFI = comparative fit index.