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. Author manuscript; available in PMC: 2010 Nov 1.
Published in final edited form as: Drug Alcohol Depend. 2009 Jul 16;105(1-2):56–62. doi: 10.1016/j.drugalcdep.2009.06.010

Figure 1.

Figure 1

The percentage of subjects retained in the study as a function of group assignment. The solid line represents data from the AC (Abstinence Contingent) group and the dashed line represents data from the YC (Yoked Control) group. The X axis shows the number of Day in the intervention.