Symbolic and non symbolic numerical representation in adults with and without developmental dyscalculia

Table 1 Mean standard score in the screening tests for each group and the average standard score of the two groups

	Text reading		Rapid naming		Phoneme omission		Questionnaire				Simple calculation		Number line positioning		Procedural knowledge
	Acc	RT	Letters	Numbers	Acc	RT	A	B	C	D	Acc	RT	Acc	RT	Acc	RT
DDs	.59	.16	.66	-.04	.01	.07	-.24	-.35	.37	.14	−1.36	−1.06	−1.35	.34	−1.72	−1.31
Controls	.67	.67	1.06	.82	.45	.23	.19	.16	.31	.04	0.7	.35	1.3	.27	.67	.58
Average	.63	.41	.88	.42	.25	.16	-.01	-.08	.34	.08	-.25	-.31	-.34	.3	-.44	-.3
T	-.38	−1.21	−1.63	−3.18**	−1.78	-.59	−1.16	-.95	-.01	.36	−5.9**	−4.4**	−5.89**	-.31	−7.13**	−6.1**

Note: a, Attention in adulthood; b, Attention in childhood; c, Impulsiveness and hyperactivity in adulthood; d, Impulsiveness and hyperactivity in childhood. Sig. = An independent T test significant.