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  • Title: Employment-based abstinence reinforcement as a maintenance intervention for the treatment of cocaine dependence: post-intervention outcomes.
    Author: DeFulio A, Silverman K.
    Journal: Addiction; 2011 May; 106(5):960-7. PubMed ID: 21226886.
    Abstract:
    AIMS: Due to the chronicity of cocaine dependence, practical and effective maintenance interventions are needed to sustain long-term abstinence. We sought to assess the effects of long-term employment-based reinforcement of cocaine abstinence after discontinuation of the intervention. DESIGN: Participants who initiated sustained opiate and cocaine abstinence during a 6-month abstinence reinforcement and training program worked as data entry operators and were randomly assigned to a group that could work independently of drug use (control, n = 24), or an abstinence-contingent employment (n = 27) group that was required to provide cocaine- and opiate-negative urine samples to work and maintain maximum rate of pay. SETTING: A non-profit data entry business. PARTICIPANTS: Unemployed welfare recipients who persistently used cocaine while in methadone treatment. MEASUREMENTS: Urine samples and self-reports were collected every 6 months for 30 months. FINDINGS: During the employment year, abstinence-contingent employment participants provided significantly more cocaine-negative samples than controls (82.7% and 54.2%; P = 0.01, OR = 4.61). During the follow-up year, the groups had similar rates of cocaine-negative samples (44.2% and 50.0%; P = 0.93) and human immunodeficiency virus risk behaviors. Participants' social, employment, economic and legal conditions were similar in the two groups across all phases of the study. CONCLUSIONS: Employment-based reinforcement effectively maintains long-term cocaine abstinence, but many patients relapse to use when the abstinence contingency is discontinued, even after a year of abstinence-contingent employment. Relapse could be prevented in many patients by leaving employment-based abstinence reinforcement in place indefinitely, which could be facilitated by integrating it into typical workplaces.
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