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Effects of receiving additional off-site services on abstinence from illicit drug use among men on methadone: A longitudinal study

  • Wu, Elwin
  • El-Bassel, Nabila
  • Gilbert, Louisa
  • Chang, Mingway
  • Sanders, Glorice
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    Health and psychosocial service needs that may be co-morbid with opioid addiction may impede the success of drug treatment among patients attending methadone maintenance treatment programs (MMTPs). This longitudinal panel study investigates whether receipt of services from one or more helping professionals outside of the MMTP confers a benefit for drug treatment outcomes among a random sample of male MMTP patients (NÂ =Â 356). Each participant was interviewed 3 times, with 6 months between each interview. Since this observational study did not employ random assignment, propensity score matching was employed to strengthen causal validity of effect estimates. Results support hypotheses that receiving additional off-site services has significant beneficial effects in increasing the likelihood of abstaining from cocaine, heroin, and any illicit drug use over both the ensuing 6- and 12-month time periods. These findings indicate that receipt of additional medical and/or psychosocial services enhances the efficacy of methadone treatment in increasing abstinence from illicit drug use.

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    File URL: http://www.sciencedirect.com/science/article/B6V7V-4XSJVP8-1/2/fff1b72f5423e4b75aac897b6d54007c
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    Article provided by Elsevier in its journal Evaluation and Program Planning.

    Volume (Year): 33 (2010)
    Issue (Month): 4 (November)
    Pages: 403-409

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    Handle: RePEc:eee:epplan:v:33:y:2010:i:4:p:403-409
    Contact details of provider: Web page: http://www.elsevier.com/locate/evalprogplan

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    1. Doris Weichselbaumer & Rudolf Winter-Ebmer, 2005. "A Meta-Analysis of the International Gender Wage Gap," Journal of Economic Surveys, Wiley Blackwell, vol. 19(3), pages 479-511, 07.
    2. Patrick Royston, 2004. "Multiple imputation of missing values," Stata Journal, StataCorp LP, vol. 4(3), pages 227-241, September.
    3. Rajeev H. Dehejia & Sadek Wahba, 2002. "Propensity Score-Matching Methods For Nonexperimental Causal Studies," The Review of Economics and Statistics, MIT Press, vol. 84(1), pages 151-161, February.
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