Table 1.

Clinical characteristics and demographics

	Methamphetamine				Healthy subjects				Significance
	Total	Female	Male		Total	Female	Male
Subject demographics	(n=51)	(n=23)	(n=28)	p-value	(n=23)	(n=11)	(n=12)	p-value
Education (years)	12.7 (1.8)*	12.6 (2.0)	12.8 (1.6)	.65	13.9 (1.3)*	13.9(1.2)	13.9(1.5)	.95	t72=2.88, p=.005*
Handedness (right/left)	43/8	20/3	23/5	.47	22/1	10/1	12/0	.48	FET, p=.16
Ethnicity (white/others)	45/6	20/3	25/3	.57	21/2	10/1	11/1	.74	FET, p=.52
Onset age of METH use (yrs)	21.7 (6.6)	20.4 (5.9)	22.8 (7.0)	.20	-	-	-	-	-
Duration of METH use (yrs)	11.1 (7.0)	9.3 (5.8)	12.5 (7.6)	.10	-	-	-	-	-
Abstinence of METH use (days)	38.1 (42.5)	46.3(54.1)	31.4(29.2)	.21	-	-	-	-	-
Daily dosage of METH use (g)	1.3 (1.4)	1.1(1.0)	1.4(1.7)	.46	-	-	-	-	-

Data are expressed with mean (SD);

^*Indicates statistical significance between methamphetamine and healthy group;

Abbreviations: METH, methamphetamine; FET, Fisher's Exact Test