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. Author manuscript; available in PMC: 2016 Aug 1.
Published in final edited form as: J Subst Abuse Treat. 2015 Mar 12;55:29–38. doi: 10.1016/j.jsat.2015.02.010

Figure 2.

Figure 2

Percent of participants confirmed abstinent from smoking at each follow-up period by assignment to Motivational Interviewing (MI) versus Brief Advice (BA) treatment and by CV (Contingent Vouchers) versus NCV (Noncontingent Vouchers) condition assignment. No main effects are significant. Standard errors are so small that standard error bars are not visible.