Table 2.

Model fit indices within white and gray matter, where the model with freely estimated covariance structure was preferred for both. w_i(AIC) = the rounded Akaike weights; w_i(BIC) = the rounded Schwarz weights

	Model	df	AIC	w_i(AIC)	saBIC	w_i(saBIC)	χ²	Δχ²	Δdf	p value
Gray matter	Freely estimated	115	8834.1	0.999	8905	0.998	579.79
	Constrained	121	8847.2	0.001	8911	0.002	604.88	19.59	6	0.003
White matter	Freely estimated	144	14,229	0.999	14,295	0.996	769.83
	Constrained	150	14,246	0.001	14,305	0.004	799.32	25.43	6	0.001