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. Author manuscript; available in PMC: 2014 Jun 1.
Published in final edited form as: Drug Alcohol Depend. 2012 Nov 26;130(0):77–84. doi: 10.1016/j.drugalcdep.2012.10.025

Figure 2.

Figure 2

Percentage of participants simultaneously abstinent from cocaine and opiates on 66 successive urine test days in the Baseline phase (18 specimens) and Intervention phase (48 specimens) in the three experimental groups. In the figure, missing specimens (including those due to dropout) are assumed positive. The statistical analyses (SAS Proc Glimmix) treated missing specimens as missing. Contrary to our expectation, group “Both” was less likely to achieve abstinence than group “CM” (see Results section for statistics).