Table 1.

Demographic Characteristics of Control and Cocaine-Addicted Subjects

Characteristic	Control (n = 22)		Cocaine-Addicted early-onset (n=10)		Cocaine-Addicted late-onset (n=10)		F value	p-value
	mean/n	sd/%	mean/n	sd/%	mean/n	sd/%
Age in yrs, mean (SD)a	34.4	6.8	34.9	7.4	38.9	5.5	1.62	0.21
Education in yrs, mean (SD)	15	2.7	11.9d	1.9	12.1d	2.4	7.1	0.002
Male, No. (%)b	12	54.6	5	50	6	60	0.2	0.90
Race, n (%)b							3.77	0.44
Black	11	50	6	60%	8	80%
White (non-Hispanic)	9	40.9	4	40	2	20
Hispanic	2	9.1	0	0	0	0
Cigarette Use, mean (SD)a
Cigarettes/day	0.3	0.8	13.5d	7.7	9.5d	8.0	22.0	<0.001
Pack years	3.1	4.5	14.7d	8.9	14.1d	11	3.53	0.05
Cocaine Use, mean (SD)a
Age of onset of cocaine use	---	---	16.4	2.4	27.4	6.0	21.9	<0.001
Days used in previous 90 days	---	---	69.1	28.7	74.4	24.3	0.66	0.43
Yrs used in lifetime	---	---	11.4	6.7	8	6.7	1.28	0.27
Lifetime dollars spent on cocaine	---	---	206330	141578	219836	337509	0.01	0.91
InDUCa	2.3	3.1	36.5	5.5	36	6	122.6	<0.001
Days abstinent at testinga	---	---	29.3	8.6	25.6	7.2	1.09	0.31
Personality Measuresa
Impulsiveness N5 (NEO-PI-R)	48.1	10.6	58.4c	6.63	51.1	5.7	4.28	0.022
Self-discipline C5 (NEO-PI-R)	51.4	13.0	40.9	16.2	41.7	8.5	2.75	0.078
Deliberation C6 (NEO-PI-R)	54.5	12.3	41.0c	8.8	45.5	9.8	5.13	0.011
Impulsiveness NS2 (TCI)	3.2	2.1	5.6c	3.3	4.7	0.49	3.39	0.045
Fear of Uncertainty HA2 (TCI)	2.9	1.7	3.2	1.8	4.3	1.6	2.25	0.120
Purposefulness S2 (TCI)	6.8	1.4	5.5	2.0	6.3	1.3	2.39	0.106
Congruent Second Nature S5 (TCI)	10.4	1.8	7.6d	2.5	7.0d	1.6	12.49	<0.001

^avalues obtained by ANOVA

^bvalues obtained by Chi-square test

^cp<0.05 (control vs. early- or late-onset)

^dp<0.01 (control vs. early- or late-onset)