Table 1.

Demographics and drug use-related measures of all study participants^{^a}

	Test	Controls	CUD+	CUD−
	(χ², F, t or Z)	(N = 25)	(N = 25)	(N = 25)
Demographics
Gender: female/male	3.2	2/23	1/24	3/22
Race: African-American/other^{^b}	9.2	17/8	19/6	18/7
Age (years)	2.0	40.8 ± 7.3	44.9 ± 4.5	42.5 ± 7.7
Education (years)	0.6	13.0 ± 3.2	13.1 ± 1.7	12.2 ± 1.5
Nonverbal IQ: Wechsler Abbreviated Scale of Intelligence: Matrix Reasoning Scale	0.3	9.6 ± 3.4	9.7 ± 3.3	10.1 ± 2.9
Depression: Beck Depression Inventory II	2.8	3.4 ± 4.7	5.4 ± 5.2	4.8 ± 4.0
Socioeconomic status: Hollingshead Index	0.1	33.2 ± 12.6	33.4 ± 11.1	32.7 ± 11.2
Drug use
Cigarette smokers (current smokers/past smokers/nonsmokers)	23.2^*	5/3/17	16/3/6	16/5/4
Daily cigarettes (current smokers: N = 5/16/16)	0.6	1.4 ± 3.5	6.3 ± 6.8	5.0 ± 4.6
Age of onset of cocaine (years)	0.4	—	24.9 ± 5.8	25.8 ± 7.0
Duration of use of cocaine (years)	0.2	—	15.8 ± 5.8	15.5 ± 8.3
Duration of current abstinence (days)	5.6^*	—	2.1 ± 2.9	31.6 ± 25.1
Cocaine use during last 30 d: days/week	5.7^*	—	3.7 ± 2.6	1.4 ± 2.0
Cocaine use during last 30 d: $/sitting	0.2	—	98.7 ± 91.4	100.0 ± 165.8
Cocaine use during last 12 months: days/week	1.1	—	4.4 ± 2.5	5.2 ± 2.2
Cocaine use during last 12 months: $/sitting	0.7	—	102.5 ± 100.4	136.4 ± 148.5
Maximum cocaine use (days/week)	0.4	—	6.0 ± 1.8	6.0 ± 1.7
Total score on the Cocaine Selective Severity Assessment Scale	2.9^*	—	20.0 ± 10.7	12.8 ± 7.6
Severity of Dependence Scale (0–15)	1.8	—	8.0 ± 3.4	9.8 ± 2.4
Cocaine Craving Questionnaire (0–45)	4.2^*	—	24.12 ± 10.5	12.8 ± 10.1

↵*p < 0.05.
↵^aχ² Tests were used for categorical variables; Mann–Whitney U for all drug-related variables (continuous non-normally distributed variables), and ANOVAs for all comparisons between the three groups; values are frequencies or means ± SD.
↵^bOther: Caucasian/Hispanic/Asian/biracial.