Table 1.

Demographic and clinical characteristics of ADHD and TD groups overall and within sex. Cohen's d is used to measure effect size.

	TD			ADHD			TD vs. ADHD
	Girls	Boys	TD Girls vs. TD Boys	Girls	Boys	ADHD Girls vs. ADHD Boys	TD Girls vs. ADHD Girls	TD Boys vs. ADHD Boys	TD All vs. ADHD All
	(n = 61)	(n = 136)		(n = 47)	(n = 118)
	Mean (SD)	Mean (SD)	Effect Size	Mean (SD)	Mean (SD)	Effect Size	Effect Size	Effect Size	Effect Size
Age	10.09 (1.01)	10.43 (1.21)	- 0.30	10.19 (1.33)	10.21 (1.43)	-0.01	-0.08	0.17	0.10
IQ	113.13 (10.31)	116.60 (12.28)	- 0.30	107.68 (14.25)	105.90 (12.54)	0.14	0.45*	0.87***	0.73***
SES Family	54.54 (8.99)	53.97 (9.93)	0.06	51.96 (8.95)	51.14 (9.94)	0.08	0.29	0.29*	0.29**
Inattention T-Score	46.46 (6.37)	45.27 (5.71)	0.20	82.35 (8.56)	72.77 (9.45)	1.04***	- 4.86***	- 3.58***	- 3.67***
Hyperactive-Impulsive T-Score	46.18 (5.02)	46.83 (5.72)	- 0.12	76.98 (13.48)	72.92 (12.58)	0.32	- 3.2***	- 2.73***	- 2.85***
GNG RT variability	105.87 (48.94)	92.22 (48.82)	0.28	128.68 (56.66)	148.83 (99.66)	- 0.23	- 0.43*	- 0.69***	- 0.61***
GNG ComRate	0.35 (0.18)	0.41 (0.18)	- 0.30	0.38 (0.18)	0.51 (0.19)	- 0.70***	- 0.13	- 0.56***	- 0.45***
Framewise Displacement	0.04 (0.03)	0.04 (0.02)	0.01	0.05 (0.03)	0.05 (0.03)	0.18	- 0.43*	- 0.29*	- 0.33**
% Stim Med	0	0	n/a	55.32%	60.17%	- 0.10	n/a	n/a	n/a
% Non-Stim Med	0	0	n/a	6.38%	10.17%	-0.15	n/a	n/a	n/a
% ODD	0	0	n/a	36.73%	30.89%	0.12	n/a	n/a	n/a
% Anxiety	1.64%	2.21%	-0.04	23.40%	19.49%	0.09	-0.73***	-0.59***	-0.63***
% Depression	0	0	n/a	0	4.24%	n/a	n/a	n/a	n/a