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. Author manuscript; available in PMC: 2016 Jan 31.
Published in final edited form as: Addict Behav. 2014 Sep 28;41:20–28. doi: 10.1016/j.addbeh.2014.09.021

Figure 3.

Figure 3

Survival (time-to-first use) trajectories for the 4 classes of opioid users. Class sample sizes were as follows: Class 1 (n = 40); class 2 (n = 441); class 3 (n = 100); and Class 4 (n = 72).