Exhibit 3.

Unadjusted and Adjusted Willingness to Enter Treatment among Participants with Substance and Alcohol Use Disorders Comparing Treatment Arms, 2013

N Percent (N)	Participants with Substance Use Disorders			Participants with Alcohol Use Disorders
	Unadjusted Willingness to Enter Treatment			Unadjusted Willingness to Enter Treatment
	Usual Care	Primary Care	Collaborative Care	Usual Care	Primary Care	Collaborative Care
	140 24.3 (34)	98 37.8 (37)	106 34.0 (36)	210 17.6 (37)	207 20.3 (42)	217 20.7 (45)
Difference 95% CI	Unadjusted Differences in Willingness to Enter Treatment			Unadjusted Differences in Willingness to Enter Treatment
	PC - UC	CC - UC	PC - CC	PC - UC	CC - UC	PC - CC
	13.5 [1.5, 25.4]	9.7 [−1.8, 21.2]	3.8 [−9.4, 17.0]	2.7 [−4.8, 10.2]	3.1 [−4.3, 10.6]	−0.4 [−8.1, 7.2]
N Percent (N)	Adjusted Willingness to Enter Treatment			Adjusted Willingness to Enter Treatment
	Usual Care	Primary Care	Collaborative Care	Usual Care	Primary Care	Collaborative Care
	140 24.6 (34)	98 37.2 (37)	106 34 (36)	210 17.6 (37)	207 20.3 (42)	217 20.8 (45)
Difference 95% CI	Adjusted Differences in Willingness to Enter Treatment			Adjusted Differences in Willingness to Enter Treatment
	PC - UC	CC - UC	PC - CC	PC - UC	CC - UC	PC - CC
	12.6 [0.8, 24.4]	9.4 [−2.0, 20.8]	3.2 [−9.8, 16.2]	2.6 [−4.9, 10.1]	3.1 [−4.3, 10.6]	−0.5 [−8.2, 7.2]