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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 2.

Figure 2

The proportion of negative samples posted to the study website as a function of group assignment. Closed bars represent data from the AC (Abstinence Contingent) group and open bars represent data from the YC (Yoked Control) group. X axis: Week in the intervention.