Table 2.

Means (and standard deviations within parentheses) for the dependent variables used (minimum and maximum values) in the four tasks performed by ADHD and TD children, Student t-test and Cohen’s d.

	ADHD children (n = 26)	TD children (n = 29)	Students t (significance)	Cohen’s d
Direct digits (min 3–max 6)	4.27 (0.67)	4.83 (0.66)	-3.12 (0.01)	0.84
Reversed digits (min 2–max 5)	3.08 (0.89)	3.66 (0.61)	-2.83 (0.01)	0.76
Total digits (min 5–max 11)	7.35 (1.38)	8.48 (1.12)	-3.36 (0.01)	0.90
Digits single task (min 0.13–max 1)	0.69 (0.19)	0.70 (0.15)	-1.12 (0.91)	0.06
Digits dual task (min 0.18–max 1)	0.72 (0.21)	0.68 (0.17)	0.72 (0.48)	-0.21
Box-crossing single task (min 45–max 146)	89.77 (23.60)	118.79 (14.95)	-5.51 (0.01)	0.47
Box-crossing dual task (min 39–max 156)	89.08 (27.35)	102.38 (29.32)	-1.73 (0.09)	0.47
Mu index (min 61.79–max 128.02)	101.16 (13.04)	91.84 (12.60)	2.70 (0.01)	-0.73
TMT-A (s) (min 27–max 105)	62.35 (15.79)	57.52 (17.68)	1.06 (0.29)	-0.29
TMT-B (s) (min 80–max 503)	195.15 (100.01)	144 (52.07)	2.42 (0.02)	-0.64
B/A index (min 0.7–max 6.28)	3.12 (1.10)	2.51 (1.13)	2.04 (0.05)	-0.55
B-A index (min–max)	132.81 (90.92)	86.48 (48.66)	2.39 (0.02)	-0.64
Stroop-Word (min 65–max 143)	99.15 (16.72)	117.34 (10.14)	-4.94 (0.01)	1.32
Stroop-Color (min 55–max 96)	72.00 (8.93)	76.07 (8.65)	-1.72 (0.09)	0.46
Stroop Word-Color (min 32–max 59)	43.00 (5.73)	45.79 (5.68)	-1.81 (0.08)	0.49
Stroop Interference (min -25.48–max 37.24)	1.68 (11.03)	-0.28 (4.83)	0.87 (0.39)	-0.23
1-Back (errors) (min 0–max 10)	1.85 (2.43)	1.00 (1.07)	1.7 (0.09)	-0.45
2-Back (errors) (min 0–max 10)	5.04 (2.54)	3.10 (2.06)	3.12 (0.01)	-0.84
3-Back (errors) (min 1–max 11)	6.35 (2.15)	5.62 (1.47)	1.47 (0.15)	-0.40
N-Back (total errors) (min 2–max 27)	13.23 (5.81)	9.72 (3.27)	2.78 (0.01)	-0.80
N-Back (omissions) (min 2–max 19)	8.96 (4.37)	7.48 (2.42)	1.58 (0.12)	-0.42
N-Back (false alarms) (min 0–max 21)	2.27 (4.28)	0.83 (1.04)	1.76 (0.08)	-0.46
N-Back (perseverations) (min 0–max 4)	2 (1.27)	1.41 (1.18)	1.78 (0.81)	-0.48