TABLE 1.

Demographic characteristics of study participants

	CONTROLS (n = 75)	COCNT (n = 53)	TR-COC (n = 42)	ALL COCAINE USERS (n = 95)
Age (years)	33.3 ± 9.2	40.2 ± 7.2	41.1 ± 9.8	40.6 ± 8.4*
Sex (M/F)	47/28	47/6	33/9	80/15*
Race (B/W/H/O)	47/13/6/9	33/14/5/1	21/12/7/2	54/26/12/3
Years of education	14.7 ± 2.2	12.9 ± 1.6	12.3 ± 1.7	12.7 ± 1.6*
Years of cocaine use	—	14.0 ± 8.3	11.3 ± 7.5	12.7 ± 8.0
Age of 1st cocaine use (years)	—	22.8 ± 5.6	23.2 ± 2	23.0 ± 6.1
Marijuana abuse	—	22(41.5%)	16(38.1%)	38(40%)
Alcohol dependence	—	21(39.6%)	15(35.7%)	36(37.9%)
Subjects with TBI	6(8%)	14(26.4%)	14(33.3%)	28(29.5%)*
Age of 1st TBI	20.33 ± 13.98	16.0 ± 6.93	16.85 ± 9.30	16.41 ± 8.0

Data are presented as means (± SD) or as frequency. Sex is indicated as female (F) and male (M); race is indicated as Black (B), White (W), Hispanic (H), or Other (O).

COCNT, non-treatment seeking cocaine-dependent subjects; TR-COC, treatment-seeking cocaine-dependent subjects; TBI, traumatic brain injury.

^*p < .01 v/s control subjects.