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. Author manuscript; available in PMC: 2019 Mar 1.
Published in final edited form as: Drug Alcohol Depend. 2017 Dec 27;184:33–41. doi: 10.1016/j.drugalcdep.2017.11.011

Figures 2.

Figures 2

a and b

Cumulative Hazard Functions for (a) Alcohol and (b) Marijuana Initiation, by ADHD Subtype Diagnosis

The y-axis is the probability of initiation use in the next year for each group. Hazard functions of groups sharing the same superscript (i.e., either a or b) did not differ significantly at p < .05. When effects on marijuana initiation were adjusted based on alcohol initiation prior to or at the same age as marijuana (as it was for 80% of marijuana users), effect sizes for both types of ADHD symptoms on marijuana initiation were substantially reduced, though still highly significant (p < .0001).