Table 5. Means (SD) for Total Number of Hits, False Alarms, Reaction Time to Hits, and Reaction Times to False Alarms on The Go/No-Go Task.

	Ex-ecstasy users (EEs)	Polydrug controls (PCs)	Drug-naive controls (DCs)
Total hits*	70.31 (0.84)	66.21 (5.56)	69.36 (2.42)
Total false alarms‡	8.62 (4.19)	13.64 (4.73)	8.73 (3.47)
Reaction time to hits (msec)§	404.05 (48.61)	352.95 (45.05)	384.43 (49.85)
Reaction time to false alarms (msec)	363.51 (42.49)	320.51 (37.51)	354.27 (68.76)

Significant comparisons: ^*EE>PC (p=0.008); ^‡PC>EE (p=0.01), and PC>DC (p=0.02); ^§EE>PC (p=0.03). All p-values are corrected.