Table 2.

Go-no-go task performance by diagnostic group and by sample. Means and standard deviations in parentheses.

	Slow event rate			Fast event rate			Slow vs. Fast
	ADHD	Control	F (1,65)=	ADHD	Control	F (1,67)=	ADHD	Control
	(n=46)	(n=21)		(n=51)	(n=18)		t(95)=	t(37)=
Accuracy	0.88 (0.09)	0.93 (0.04)	5.05p=.03, η2 =0.07*	0.86 (0.05)	0.91 (0.04)	13.69, p=001, η2 =0.17***	1.72,p=.09	1.50,p=.14
%omissions	0.07 (0.08)	0.03 (0.02)	5.54p=.02, η2 =0.08*	0.04 (0.04)	0.02 (0.04)	1.80p=.18, η2 =0.03	2.20,p=.03*	0.18,p=.86
%failed inhibits	0.25 (0.16)	0.20 (0.10)	1.53p=.22, η2 =0.02	0.44 (0.15)	0.29 (0.12)	14.44p<.001, η2 =0.18***	−5.96,p<.001***	−2.32,p=.03*
RT (ms)	681.82 (83.59)	644.53 (64.42)	3.28p=.08, η2 =0.05	588.56 (88.34)	585.48 (67.80)	0.02p=.89, η2 <.001	5.32,p< .001***	2.78,p=.01**
SDRT (ms)	234.47 (47.64)	197.08 (39.13)	9.87p=.003, η2 =0.13**	219.14 (38.11)	188.16 (33.27)	9.35p=.003, η2 =0.12**	1.76,p=.08	0.76,p=.45
Ter (seconds)	0.415 (0.06)	0.437 (0.05)	1.97p=.16, η2 =0.03	0.393 (0.05)	0.403 (0.05)	0.58,p=.45, η2=0.009	2.00,p=.05*	2.28,p=.03*
a	0.162 (0.02)	0.160 (0.02)	0.06p=.80, η2 =.001	0.152 (0.01)	0.152 (0.02)	<.00p=.99, η2 <.001	2.69,p=.008**	1.33,p=.19
z	0.092 (0.01)	0.100 (0.02)	4.33p=.04, η2 =0.06*	0.103 (0.02)	0.105 (0.02)	0.15,p=.70, η 2 =0.002	−3.95,p<.001***	0.03,p=.42
v to “go”	0.238 (0.08)	0.285 (0.08)	5.06p=.03, η2 =0.07*	0.223 (0.05)	0.250 (0.06)	3.77p=.06, η2 =0.05	1.26,p=.21	1.53,p=.14
v to “no-go”	−0.157 (0.11)	−0.197 (0.07)	2.2, p=14, η2 =0.03	−.109 (0.08)	−.198 (0.10)	15.13p<.001, η2 =0.18**	−2.48,p=.02**	−0.82,p=.98

Note.

^*p<.05

^**p<.01

^***p<.001

RT = reaction time. SDRT = standard deviation of RT. Ter = non-decision time. a = boundary separation, where larger values indicate more conservative responding. z = the distance between the start point and no-go boundary. v = drift rate. Larger absolute values of drift (v) indicate faster drift.