Table 1.

Task Performance on the Drug-Word Stroop and Color-Word Stroop Tests in Stimulant-Dependent Individuals and Healthy Comparison Volunteers^a

Dependent Variable	Effect	df	F	P Value
Drug-word Stroop task
Attentional interference score (median latency)	Drug	2, 62	1.75	.18
	Drug×group	2, 62	0.28	.97
	Group	1, 31	10.87	.02^a
Attentional interference score (mean latency)	Drug	2, 62	1.24	.30
	Drug×group	2, 62	0.27	.77
	Group	1, 31	10.87	.002^a
Error rate, %	Drug	2, 62	1.32	.27
	Drug×group	2, 62	4.04	.02^a
	Group	1, 31	3.82	.06
Color-word Stroop task
Attentional interference score (median latency)	Drug	2, 62	6.14	.004^a
	Drug×group	2, 62	0.74	.48
	Group	1, 31	0.24	.63
Attentional interference score (mean latency)	Drug	2, 60	3.08	.053
	Drug×group	2, 60	0.86	.43
	Group	1, 30	0.01	.94
Error rate, %	Drug	2, 62	0.05	.96
	Drug×group	2, 62	1.19	.31
	Group	1, 31	3.01	.09

Abbreviation: BDI-II, Beck Depression Inventory–II.⁷¹

Analysis of covariance modeling of factorial effects on attentional interference and accuracy (covariates: BDI-II total scores, years of education, and plasma levels of pramipexole dihydrochloride).

Significant.