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. Author manuscript; available in PMC: 2014 Dec 3.
Published in final edited form as: Drug Alcohol Depend. 2014 Jul 11;144:42–46. doi: 10.1016/j.drugalcdep.2014.06.040

Fig. 1.

Fig. 1

Mediation analysis. at = The estimated effect of treatment with VEN-XR on marijuana withdrawal. bt = The estimated effect of marijuana withdrawal on marijuana smoking when treatment with VEN-XR is included in the model. ct= The total estimated effect of treatment with VEN-XR on marijuana smoking when marijuana withdrawal is not included in the model. ct′= The direct estimated effect of treatment with VEN-XR on marijuana smoking when marijuana withdrawal is included in the model.