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. Author manuscript; available in PMC: 2010 Apr 1.
Published in final edited form as: Drug Alcohol Depend. 2008 Apr 22;96(1-2):57–68. doi: 10.1016/j.drugalcdep.2008.01.023

Fig. 1.

Fig. 1

Growth in the adjusted means on Substance Initiation Index. Note: Substance Initiation Index combined lifetime use of alcohol, cigarettes, and marijuana and ranged from 0 (= no substances initiated) to 3 (= all three substances initiated).