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Table 3 Attendance, retention, and crack cocaine abstinence outcomes by treatment condition

From: Contingency management is effective in promoting abstinence and retention in treatment among crack cocaine users with a previous history of poor treatment response: a crossover trial

Variable During UC intervention (n = 16) During to CM intervention (n = 16) t/OR p value1
n (%) Mean ± SD n (%) Mean ± SD
Treatment attendance (sessions)   5.3 ± 7.9   19.9 ± 15.4 4.02 0.001
Retention in treatment (weeks)   3.9 ± 4.2   9.5 ± 3.3 4.89 0.001
Proportion of negative samples submitted   12.2 ± 19.9   45.3 ± 40.9 3.21 0.005
Longest duration of abstinence (weeks)   3.4 ± 6.4   12.6 ± 14.7 2.29 0.047
Retained and abstinent at the last week of treatment 0 (0)   7 (43.5)   0.016
3 or more weeks of abstinence 2 (12.5)   7 (43.5)   6 0.125
Completely abstinent during treatment 0 (0)   4 (25)   0.125
  1. UC usual care, CM contingency management, SD standard deviation
  2. 1p values were obtained using paired t test for continuous variables and the McNemar exact test for dichotomous variables