Table 1.

Background characteristics of original CTN sample, NESARC treatment seeking substance users and reweighted CTN sample

	Original CTN Sample		NESARC Treatment Seeking Substance Users		Original CTN sample versus NESARC Treatment Seeking Substance Users (p-value)a	CTN Reweighted to approximate NESARC Treatment Seeking Substance Usersb		Original CTN sample versus CTN sample reweighted to approximate NESARC Treatment Seeking Substance Users
	N=507		N=183			N= 507		(p-value)a
	Mean	SD	Mean	SD		Weighted Mean	Weighted SD
Age (years)	34.90	10.90	35.52	11.75	0.52	36.25	10.47	0.46
	N	%	N	%		Weighted N	Weighted %
Female (%)	192	37.90	75	39.29	0.75	172.00	34.14	0.21
Race (%)					<0.0001			0.80
White	284	56.00	133	73.65		372.59	74.07
Black/African American	116	22.90	33	14.52		79.61	15.83
American Indian/Alaska Native	3	0.60	5	4.54		11.49	2.28
Asian	13	2.60	1	0.76		3.19	0.63
Native Hawaiian/Pacific Islander	12	2.40	2	1.64		12.92	2.57
Multi-racial	54	10.70	9	4.89		23.20	4.61
Other	23	4.50
Hispanic/Latino (%)	55	10.80	34	14.10	0.24	43.08	8.56	0.03
Education (%)					<0.0001			0.77
< High School Degree	118	23.30	42	24.17		109.48	21.76
High School Degree/GED	310	61.10	59	30.44		152.72	30.36
> High School Degree	79	15.60	82	45.39		240.81	47.87
Marital Status (%)					<0.0001			0.77
Single/Never Married	308	60.70	75	37.79		176.21	35.03
Married/Remarried	72	14.20	53	36.12		184.49	36.68
Separated/Divorced/Widowed	127	25.00	55	26.09		142.30	28.29
Underemployed (%)	190	37.50	80	43.22	0.17	226.82	45.09	0.66
Substance Dependence (%)
Alcohol	224	44.20	85	46.10	0.66	274.29	54.53	0.05
Cocaine	177	34.90	19	10.10	<0.0001	56.49	11.23	0.67
Stimulants	100	19.70	12	7.04	<0.0001	39.82	7.92	0.70
Cannabis	146	28.80	23	12.50	<0.0001	60.67	12.06	0.88
Opiates	158	31.20	19	10.46	<0.0001	54.81	10.90	0.87
Other	41	8.10	23	12.28	0.09	57.90	11.51	0.78

^aBased on chi-square and t-tests as appropriate.

^bWeighting was done using propensity score weighting (see text for details).