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. Author manuscript; available in PMC: 2015 Nov 1.
Published in final edited form as: Drug Alcohol Depend. 2014 Sep 22;144:193–200. doi: 10.1016/j.drugalcdep.2014.09.007

Fig. 1.

Fig. 1

Observed health states at time of follow-up assessment for the 982 individuals included in our study, as well as the prevalence of drug use in each respective health state. Mutually exclusive health states are: (i) MMT with high effectiveness (current MMT receipt and no illicit opioid use in the last six months); (ii) MMT with low effectiveness (defined as current MMT receipt with illicit opioid use in the last six months); (iii) opioid abstinence (defined as no current MMT receipt and no illicit opioid use in the last six months); or (iv) relapse (defined as no current MMT receipt with illicit opioid use in the last six months). †Drugs considered for polydrug use categorization were hard drugs only, defined for our purposes as heroin, crack, cocaine, crystal methamphetamine or combination of. ‡ Heavy alcohol use is defined as consuming more than 4 drinks each day.