Table 2.

Hierarchical regression analysis.

Step and independent variable	R2	R2 change	Df	F	Final β
Step 1: trail-making test (ZVT)	0.04	0.04	1,34	1.34	−0.03
Step 2: digit-span-test	0.05	0.01	1,33	0.89	−0.28
Step 3: digit-ordering-test (DOT-A)	0.14	0.09†	1,32	1.68	−0.41*
Step 4: practiced hours	0.32	0.19**	1,31	3.99	−0.44**

Final β = β in the fourth step. ^† = p < 0.10 * = p < 0.05, ** = p < 0.01.

Dependent variable: Pr-values for the hierarchical syntax condition.