Table 1.

Descriptive statistics and one-way ANOVA among tasks in first (N = 67), second (N = 83) and third (N = 66) grades.

	First grade		Second grade		Third grade
Measures	M	SD	M	SD	M	SD	F	${\text{η}}_{\text{p}}^2$
Word reading fluency – TOWRE (correct words per 45 s)	29.35	10.84	48.83	13.61	58.78	16.74	78.81∗∗	0.42
Arithmetic fact fluency (correct answers per 3 min)	32.22	11.29	42.41	14.03	54.71	14.46	47.75∗∗	0.30
RAN digits (time)	44.82	10.71	35.95	8.22	31.35	7.88	39.52∗∗	0.26
Digit span backward (total correct items)	3.00	0.88	3.67	1.12	4.00	1.35	13.65∗∗	0.11
WM – CSOT (total correct items)	4.01	1.26	4.54	1.42	4.91	1.34	7.48∗	0.06
Inhibition – Stroop (total correct items per 45 s)	20.41	16.56	37.88	7.85	38.01	9.97	51.96∗∗	0.32

^∗p < 0.05; ^∗∗p < 0.01.