Table 1.

Baseline demographic characteristics and substance use variables by site

Variable (percent or mean (S.D.))	Site 1	Site 2	Site 3	Site 4	Site 5	Total	X² or F
Female	42.9	28.4	42.6	66.7	10.3	43.2	48.03^**
Ethnicity, European American	80	81	72	72	0	71.6	259.4^**
African American	0	6.4	20.4	0	62.1	9.8
Latino	.8	2.3	0	0	31	2.7
Multiethnic	17.6	7.3	5.6	26.3	3.4	13.8
Other	1.7	2.8	1.9	1.8	3.4	2.1
Employed full or part time	34	54	43	20	26.1	36.9	28.54^**
Married or cohabitating	74.8	81.7	77.8	85.1	93.1	80.6	7.55
Admission prompted by legal system	57	70	46	31	91.3	53.2	47.2^**
On probation or parole	35	39	30	36	82.6	37.6	22.8^**
Any previous drug/alcohol treatment	60	50	62	69	87	61.7	14.38^**
Principal drug used
Alcohol	59.5	60.6	57.9	29.8	27.6	50.3	141.7^**
Cocaine	.9	3.7	13.1	4.4	13.8	5.9
Marijuana	14.7	22	22.4	14	51.7	20.2
Opiates	4.3	4.6	4.7	5.3	6.9	4.8
Methamphetamines	20.7	8.3	0	46.5	0	18.1
Benzodiazepenes	0	.9	1.9	0	0	.6
Age	32.8 (10.4)	34.0 (11.2)	32.5 (9.1)	31.2 (9.0)	37.2 (8.8)	32.8 (9.9)	2.6^*
Years of education	11.8 (1.8)	12.8 (2.1)	12.4 (1.9)	11.8 (1.6)	11.6 (1.6)	12.2 (1.9)	7.1^**
Days of substance use, past 30	8.3 (10.3)	7.9 (8.5)	13.1 (10.4)	10.3 (9.0)	8.8 (10.0)	9.8 (9.8)	5.1^**
ASI composite scores, medical	.30 (.37)	.25 (.34)	.17 (.31)	.36 (.34)	.38 (.38)	.27 (.34)	4.286^**
Employment	.76 (.25)	.66 (.30)	.60 (.27)	.84 (.23)	.11 (.11)	.72 (.28)	16.73^**
Alcohol	.20 (.22)	.17 (.18)	.31 (.28)	.20 (.25)	.09 (.09)	.21 (.23)	7.62^**
Drug	.10 (.10)	.08 (.11)	.14 (.11)	.16 (.12)	.07 (.07).	.11 (.12)	8.07^**
Legal	.24 (.21)	.12 (.17)	.18 (.20)	.22 (.24)	.16 (.16)	.19 (.21)	6.764^**
Family	.14 (.21)	.15 (.21)	.18 (.23)	.26 (.25)	.20 (.20)	.18 (.22)	4.29^**
Psychological	.21 (.23)	.23 (.22)	.30 (.25)	.40 (.21)	.15 (.15)	.27 (.22)	14.18^**

Note: n's for Sites 1–4 = 100, n for Site 5 = 23. Individual sites are not identified to protect anonymity of participants and clinicians.

p < .05.

^**

p < .01.