Table 4. Hierarchical regression analysis of Math Calculation Skills.

Calculation Skills	R2	R2 change	β	SE	t	p
Model 1	0.23
FSIQ			0.32	0.11	2.96	0.004
Reading			0.46	0.15	3.08	0.003
Model 2	0.27	0.038
FSIQ			0.34	0.11	3.23	0.002
Reading			0.41	0.15	2.78	0.006
EQ-C			−0.40	0.17	−2.39	0.019

Model 1: variance accounted for by FSIQ and reading; Model 2: additional variance accounted for by EQ-C after controlling for effects of domain general predictors.