Table 2.

Working Memory and Processing Speed Tasks by Subgroup.

	MD		TA		F	d
	M	SD	M	SD
Working memory for numbers	3.28	1.61	4.05	1.67	4.48	−0.46
Working memory for words	1.87	1.45	2.52	1.30	4.62	−0.47
Digit span forward	6.97	1.87	7.77	1.61	4.36	−0.45
Digit span backward	4.59	1.39	5.20	1.62	3.39	−0.40
Rapid number naming	17.92	6.29	15.07	3.70	6.52	−0.55
Rapid picture naming	99.62	14.06	105.50	13.90	3.82	−0.42
Letter number sequence	7.23	2.70	9.61	3.12	13.67**	−0.77
Quantitative concepts	94.78	8.93	110.18	13.71	35.63**	−1.30
Block rotation	98.87	17.43	105.27	16.72	2.91	−0.37

Note: Negative d indicates that children with MD obtained lower performance than TA children. MD = math disability; TA = typically achieving.

^**p < .005.