Table 1.

Demographics, Substance Use Characteristics, and BIS Impulsivity Scores of Methamphetamine Users.

	Total	Females	Males	t, U, X²	p
Age	35.0(8.6)	35.3(9.7)	34.9(8.2)	−0.22	0.83
Sex (N)	157	44	113
Ethnicity^a
White	63	24	39	5.29	0.02
Black	40	8	32	1.71	0.19
Asian	6	1	5	0.40	0.53
Latino	59	15	44	0.32	0.57
Native American	4	1	3	0.02	0.89
Past month MA dependence (N)^b	137	40	97	0.55	0.46
Past month MA abuse (N)^b	116	28	88	3.70	0.06
Age at first MA use	22.7(7.7)	21.8(6.9)	23.0(7.9)	0.88	0.38
Years of MA use	12.3(8.6)	13.4(9.7)	11.9(8.1)	−1.0	0.32
Grams of MA use (in past 30 days)^c	19.0(32.9)	18.4(25.5)	19.2(35.6)	0.13	0.89
Smoking Frequency (Daily/Occasionally/Not at All)	83/24/50	25/5/14	58/19/36	0.80	0.67
Alcohol Use Frequency^b				3.84	0.43
Never	31	10	21
Monthly or less	57	19	38
2–4 times a month	26	5	21
2–3 times a week	24	4	20
4 or more times a week	18	6	12
Marijuana Smoker (Yes/No)^b	70/86	15/29	55/57	2.88	0.09
BIS-11 Total	67.6(13.3)	70.7(12.4)	66.4(13.2)	−1.84	0.07
BIS-11 Attentional	16.4(4.7)	17.5(4.3)	16.0(4.7)	−1.78	0.08
BIS-11 Motor	24.4(5.5)	25.0(5.8)	24.1(5.3)	−0.99	0.32
BIS-11 Non-planning	26.9(5.6)	28.2(4.8)	26.3(5.8)	−1.88	0.04

Mean (standard deviation) unless otherwise noted. Bold p values indicate significant group differences between males and females.

Participants may have indicated multiple ethnicities.

Missing for one participant.

Missing for 7 males and 1 female.