Extended Voucher-based Reinforcement Therapy for Long-term Drug Abstinence
Abstract:Objective : To determine whether longer durations of voucher-based reinforcement therapy (VBRT) increase long-term abstinence compared to standard durations.
Methods : Cocaine-abusing or dependent methadone-maintenance patients (N 130) were randomized to receive either Standard (12-week; N 62) or Extended (36-week; N 68) VBRT. Participants provided 3 urine samples weekly during VBRT, and each cocaine-negative sample produced a voucher exchangeable for goods and services.
Results : Extended VBRT produced longer durations of self-reported continuous abstinence during study Year 1 (M 74 vs. 46 days; F(1,128) 5.23, P 0.024), but not during Year 2. However, each week of abstinence during Year 1 was associated with an increase of 9.19 days of abstinence during Year 2, regardless of study condition (t(1) 4.92, P < 0.001).
Conclusions : Longer-duration VBRT can increase abstinence during VBRT, but may not maintain it afterwards. However, longer during-treatment abstinence begets later abstinence suggesting that further research regarding this relationship is needed.
Document Type: Research Article
Affiliations: 1 Project Coordinator, Treatment Research Institute, Philadelphia, PA.
Publication date: November 1, 2010
The American Journal of Health Behavior seeks to improve the quality of life through multidisciplinary health efforts in fostering a better understanding of the multidimensional nature of both individuals and social systems as they relate to health behaviors.
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