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. Author manuscript; available in PMC: 2017 Jun 1.
Published in final edited form as: J Adolesc. 2016 Apr 11;49:158–169. doi: 10.1016/j.adolescence.2016.03.012

Figure 2.

Figure 2

Substance use trajectory classes. Trajectories are the implied mean values obtained from a 4-class Poisson growth mixture model, after back transformation to the original count metric.