Table 1. Baseline (week −1) demographic and clinical characteristics.a.

Characteristic	Total N=50	Placebo N=25	Gabapentin N=25	p-value
Demographics
Age, years	33.9 (9.7)	34.4 (10.8)	33.4 (8.5)	0.72
Male	44 (88%)	21 (84%)	23 (92%)	0.39
White, non-Hispanic	38 (76%)	19 (76%)	19 (76%)	0.76
Education, years	14 (1.9)	14.2 (1.9)	13.6 (1.8)	0.35
College degree	14 (28%)	8 (32%)	6 (24%)	0.61
Full-time employed	31 (62%)	13 (52%)	18 (72%)	0.36
Married	20 (40%)	10 (40%)	10 (40%)	0.86
Clinical assessments
BDI-II (range 0–63)	8.8 (5.1)	9.6 (5.7)	8.0 (4.5)	0.29
PSQI total score (range 0–21)	5.9 (3.1)	5.7 (3.1)	6.0 (3.1)	0.48
MWC total score (range 0–84)	14.2 (8.1)	13.6 (8.3)	14.8 (7.8)	0.61
MWC craving score (range 0–3)	2.0 (0.8)	1.9 (0.8)	2.1 (0.7)	0.44
MPS total score (range 0–38)	10.4 (5.9)	10.5 (6.6)	10.3 (5.2)	0.88
Body mass index	27.4 (4.9)	26.6 (4.5)	28.1 (5.3)	0.27
Cannabis history
MJ grams/weekb	11.0 (18.5)	9.0 (10.3)	13.0 (24.1)	0.46
Urinary CN-THCCOOH	684 (599)	687 (371)	682 (771)	0.98
Days of MJ abstinence prior to randomization	0.9 (0.2)	1.0 (20)	0.9 (28)	0.58
Years daily MJ smoking	11.6 (8.0)	11.7 (8.5)	11.5 (7.6)	0.94
Age at first MJ use	14.5 (3.5)	15.2 (2.6)	13.8 (4.1)	0.14
Dollars spent/week on MJb	86.5 (73.0)	77.1 (48.0)	96.0 (91.5)	0.37
Work days missed due to MJb	2.6 (14.1)	1.0 (3.0)	4.1 (19.8)	0.45
Other substance history
Cigarette smoker	12 (24%)	7 (28%)	5 (20%)	0.81
Parental substance abuse	20 (40%)	9 (36%)	11 (44%)	0.39

Abbreviations: MJ, marijuana; BDI-II, Beck Depression Inventory-II; PSQI, Pittsburgh Sleep Quality Index; MWC, Marijuana Withdrawal Checklist; MPS, Marijuana Problems Scale; CN-THCCOOH, THCCOOH to creatinine ratio.

^aValues given are mean (SD) unless otherwise specified as number (%).

^b90 days prior to baseline.