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. Author manuscript; available in PMC: 2016 Nov 1.
Published in final edited form as: Drug Alcohol Depend. 2015 Sep 5;156:62–69. doi: 10.1016/j.drugalcdep.2015.08.031

Fig. 1.

Fig. 1

Mean frequency of past year marijuana use by age for each trajectory group. Note: 0 = no use (0 days), 1 = less than once per month (1–11 days), 2 = at least monthly but not weekly (12–51 days), 3 = 1–3 times per week (52–156 days), and 4 = more than 3 times per week (157–365 days).