Table 1.

Sample characteristics and sample sizes for each health system

	Health system A	Health system B	Total
	n = 1836	n = 4204	N = 6040
Age in years, Mean (SD)	39 (15)	43 (14)	42 (14)
Gender,% female	50%	52%	52%
Counseling only, n	499	1781	2280
Little or no addiction treatment, n	513	1301	1814
Buprenorphine plus counseling, n	824	1122	1946