Table 1.

Cognitive performance and event-related potential measures from the cued continuous performance test: means, effect sizes and significance of group comparisons

	ADHD (n = 20) a : mean (s.d.) b	BD (n = 20): mean (s.d.) b	Controls (n = 20): mean (s.d.) b	ADHD v. BD, effect size: d	ADHD v. controls, effect size: d	BD v. controls, effect size: d
MRT, ms	425.31 (75.74)	418.30 (67.41)	391.58 (63.68)	0.05	0.49 d	0.44
RTV, ms	109.18 (58.83)	101.73 (37.77)	76.91 (39.24)	0.02	0.60 d †	0.68 d *
OE	1.10 (1.55)	1.35 (2.52)	0.60 (1.57)	0.12	0.32*	0.36†
OXO-not-XOX CE	1.05 (1.88)	0.60 (2.04)	0.50 (0.89)	0.23	0.37	0.06
Total CE	7.25 (16.03)	2.40 (5.39)	0.75 (0.97)	0.41	0.57 d *	0.43
Cue-P3 at Pz	2.30 (1.64)	1.36 (1.80)	1.83 (2.04)	0.56 d	0.26	0.25
CNV at Cz	−2.24 (1.03)	−2.31 (1.36)	−3.31 (2.12)	0.06	0.66 d *	0.58 d †
NoGo-N2 at Fz	0.57 (1.88)	2.41 (2.64)	0.84 (2.07)	0.83 c *	0.14	0.68 d *
NoGo-P3 at Cz	5.42 (2.73)	5.56 (3.31)	7.68 (2.57)	0.05	0.88 c *	0.73 d *
Go-P3 at CPz	5.01 (2.76)	5.56 (3.23)	6.10 (2.18)	0.19	0.45 d	0.20

ADHD, Attention-deficit/hyperactivity disorder; s.d., standard deviation; BD, bipolar disorder; MRT, mean reaction time; RTV, within-subject variability in reaction times; OE, omission errors; CE, commission errors; CNV, contingent negative variation.

^aOnly 18 participants with ADHD were included in the average of the Go condition, as two participants did not have at least 20 artefact-free segments.

^bMeans and s.d.s were calculated on raw data.

^cLarge effect size.

^dMedium effect size.

* p < 0.05, † p < 0.10.