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. Author manuscript; available in PMC: 2014 Mar 1.
Published in final edited form as: Drug Alcohol Depend. 2012 Sep 20;128(3):222–229. doi: 10.1016/j.drugalcdep.2012.08.027

Figure 1. Study flow.

Figure 1

  • Passive declines included failure to keep enrollment appointments after expressing initial interest in the study.
  • Active declines included direct verbal refusal to participate after discussing the study with research personnel.
  • Comprehension Difficulties included severe cognitive impairment/inability to respond to basic questions.
  • Randomization was conducted through a block random assignment procedure, such that in each block of 4 participants 2 were assigned to each condition. Participants and interviewers were blind to assignment during the baseline interview.
  • Follow-up rates:
    3 months: 95.7% (overall); 96.1% (OP condition); 95.2% (IOP condition).
    6 months: 93.0% (overall); 94.2% (OP condition); 91.7% (IOP condition).