The first two columns of Table 1 present mean state-level prevalence of past-year marijuana use and abuse/dependence, obtained as predicted values from our state-level linear regression models. Using NESARC, the average state-level prevalence of past-year marijuana use differed significantly between states with (7.13%) and without (3.57%) medical marijuana laws (P<0.0001). The average NESARC state-level prevalence of marijuana abuse/dependence also differed significantly between states with (2.61%) and without (1.27%) medical marijuana laws (P=0.0009). Using NSDUH data (not noted in Table), the average state-level prevalence of past-year marijuana use differed significantly between states with (12.17%) and without (9.77%) medical marijuana laws (p=0.0006).
