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. Author manuscript; available in PMC: 2014 Jun 1.
Published in final edited form as: Addiction. 2013 Mar 19;108(6):1136–1144. doi: 10.1111/add.12140

Table 4.

Summary of Attendance at study visits of 430 Study Participants enrolled in the PTQ Study

Study Visit Time Points Study Visit Completed
SC (n= 214) MI (n= 216)
N % N %
Week 1 191 89.3 189 87.5
Week 2 190 88.8 172 79.6
Week 4 184 86.0 174 80.6
Week 6 171 79.9 159 73.6
Week 8 168 78.5 162 75.0
Week 10 146 68.2 145 67.1
Week 12 143 66.8 155 71.8
Week 14 140 65.4 145 67.1
Week 16 137 64.0 143 66.2
Week 18 142 66.4 146 67.6
Week 20 136 63.6 146 67.6
Week 22 139 65.0 155 71.8
Week 24 141 65.9 156 72.2
Week 26 155 72.4 169 78.2