Table 1.

Demographic and clinical characteristics of cocaine use disorder and healthy control subjects

	Cocaine use disorder	Healthy controls
	n = 24	n = 25
Age	40 ± 9	37 ± 9
Sex
Females	10	11
Males	14	14
Ethnicity
African American	10	5
Caucasian	12	18
Asian	0	1
Hispanic	1	0
More than one race	1	1
Barratt Simplified Measure of Social Status
Education	14 ± 3	15 ± 4
Occupation	21 ± 10	27 ± 4*
Total	33 ± 13	42 ± 12*
Tobacco use	16	13
> 10 cigarettes per day	7	4
Cannabis use (recreational)	4	-
Hamilton Anxiety Rating Scale (range 0 to 56)	8.5 ± 7.5	2.1 ± 3.7*
Perceived Stress Scale (range 0 to 40)	15.2 ± 7.8	5.5 ± 5.3*
Cocaine Craving Questionnaire (range 0 to 70)	26 ± 15
Age of first use of cocaine (years)	23 ± 8
Duration of cocaine use (years)	15 ± 9
Cocaine use frequency per week (days)	2 ± 2
Amount spent on cocaine per week (dollars)	126 ± 64
12-week follow-up protocol to monitor for relapse following PET scan
Final Outcome
Abstinent	6
Relapsed (cocaine +)	9
Drop-out	9
Amount of money earned in vouchers (dollars)	415 ± 476
Time to an event, i.e., first relapse or drop-out or completion (days)	35 ± 34
Time to first relapse (days)	13 ± 14
Duration in follow-up protocol (days)	43 ± 35

^*p < 0.05, unpaired t-tests for numerical variables and Chi-square test for categorical variables.