Table 4.

Hierarchical regression models using control variables and cognitive skills to predict the FA of the left arcuate fasciculus-direct and the left inferior longitudinal fasciculus.

		Left AF-direct		Left ILF
Step		ΔR2	Beta	ΔR2	Beta
1	Control variables	0.154		0.133
	Age		−0.084		−0.210
	Sex		0.013		−0.026
	Whole brain mean FA		0.125		0.356*
	Head motion parameter		0.463**		−0.036
2	Group variable	0.180**		0.189**
	Diagnosis		−0.408*		−0.267
3	Cognitive variables	0.150*		0.083
	Phonological processing		0.563**		−0.130
	Morphological processing		−0.360		0.421*

Note: *p < 0.05, **p < 0.01. ΔR² is the R² change at each hierarchical step; Beta is the standardized regression coefficient.