Table 1.

Demographics, drug use, and comorbid psychiatric characteristics by group.

	METH+ (n=17)	METH− (n=23)
Characteristic	Mean +/− SD	Mean +/− SD	Statistics a
Age at scan (years)	38.0 ± 8.7	38.0 ± 11.9	t(38)=0.00, p=1.00, g=0.00
Years of education	12.1 ± 2.0	14.4 ± 2.2	t(36.49)=−3.50, p<0.001, g=−1.1
Wide Range Achievement Test-4 standard score	100.8 ± 10.5	108.1 ± 13.4	t(37.85)=−1.94, p=0.06, g=−0.6
Beck Depression Inventory (at scan)	13.9 ± 8.9	2.0 ± 3.3	t(19.25)=5.25, p<0.001, g=1.7
Profile of Mood States (at scan)	72.6 ± 34.1	57.1 ± 15.9	t(21.15)=1.74, p=0.10, g=0.6
Fagerström Test of Nicotine Dependence Total†	3.5 ± 3.3	1.3 ± 2.3	t(26.84)=2.30, p=0.03, g=0.7
% Male	100%	87%	χ2(n=1)=0.89, p=0.35
% Right-handed	94%	96%	χ2(n=1)=0.00, p=1.00
% White	59%	70%	χ2(n=2)=3.36, p=0.19
% Latino	18%	26%
% African-American	24%	4%
% Scanned on 3T General Electric MR750 system	35%	57%	χ2(n=1)=1.02, p=0.31
Antisocial personality disorder (lifetime)	53%	9%	χ2(n=1)=7.51, p=0.01
Attention-deficit/hyperactivity disorder (lifetime)	29%	0%	χ2(n=1)=5.28, p=0.02
Major depressive disorder (lifetime)	47%	17%	χ2(n=1)=2.81, p=0.09
Tobacco use (current)‡	43%	14%	χ2(n=1)=6.24, p=0.01
Alcohol dependence (lifetime)	35%	13%	χ2(n=1)=1.65, p=0.20
Cannabis dependence (lifetime)	29%	0%	χ2(n=1)=3.68, p=0.05
Cocaine dependence (lifetime)	41%	0%	χ2(n=1)=8.80, p<0.01
Opiate dependence (lifetime)	5%	0%	χ2(n=1)=0.02, p=0.88
Lifetime methamphetamine use in grams	2461 ± 2954	N/A
Lifetime methamphetamine use in days	1913 ± 1551	N/A
Age of first methamphetamine use (years)	25.4 ± 8.6	N/A
Days since last methamphetamine use	173 ± 160	N/A
Primary route of methamphetamine use	Smoking	N/A

^aStatistical comparisons were by means of Welsh t-tests or χ² tests for equality of proportions, and Hedge’s g to report effect sizes.

^†This assessment was completed only in participants who endorsed current use of tobacco.

^‡Two METH+ and 3 METH− participants did not report current levels of tobacco use.