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. Author manuscript; available in PMC: 2013 May 1.
Published in final edited form as: Drug Alcohol Depend. 2011 Oct 24;122(3):220–227. doi: 10.1016/j.drugalcdep.2011.10.001

Figure 1.

Figure 1

Three class solution of a latent class analysis of 552 users of cocaine and/or heroin in Baltimore, MD. Estimated probabilities for past-month drug use are graphed based on latent class membership. Error bars indicate standard errors of estimated probabilities.