Table 6.

CPT-II performance within the ADHD group by stimulant medication status on the day of assessment

CPT-II Measure	On stimulant medication (n=62) T-score (SD)	Not on stimulant medication (n=143) T-score (SD)	t (203)	p	Cohen’s d
Omissions %	53.44 (22.82)	55.24 (17.67)	0.610	0.542	−0.09
Commissions %	58.82 (12.12)	61.54 (11.30)	1.55	0.122	−0.24
Hit RT	46.63 (8.71)	48.29 (9.33)	1.19	0.234	−0.18
Hit RT Std. Error	44.20 (13.91)	52.90 (13.37)	4.23	<0.001	−0.64
Variability	47.73 (11.80)	54.69 (12.65)	3.69	<0.001	−0.56
Detectability (d’)	56.38 (9.78)	57.69 (9.08)	0.93	0.355	−0.14
Response Style (Beta)	47.10 (9.51)	46.68 (5.38)	−0.40	0.687	0.06
Perseverations %	51.65 (12.12)	58.25 (18.33)	2.60	0.010	−0.40
Hit RT Block Change	49.93 (7.18)	51.97 (10.02)	1.45	0.149	−0.22
Hit SE Block Change	56.56 (10.63)	59.05 (11.99)	1.41	0.160	−0.21
Hit RT ISI Change	48.04 (10.14)	52.91 (12.24)	2.75	0.006	−0.42
Hit SE ISI Change	51.04 (10.22)	53.38 (12.80)	1.27	0.205	−0.19