Table 4.

Relationship of neuropsychological tests and methamphetamine usage status in currently abusing and abstinent subjects.

	ToL	WCST (Perserverative Error)	WCST (Categories)	ST (Interference Time)	ST (InterferenceNumber)
Duration of addiction (Currently abusers subjects) Level of significance (P-value)	−0.748(0.000)	0.752(0.000)	−0.499(0.001)	0.422(0.006)	0.176(0.272)
Duration of abstinent (Abstinent subjects) Level of significance (P-value)	0.299(0.02)	0.18(0.091)	0.273(0.035)	0.246(0.058)	−0.133(0.310)

ToL: Tower of London;

WCST: Wisconsin Card Sorting Test,

ST: Stroop Test.