The prevalence of DSM-IV marijuana use disorder increased significantly between 2001–2002 (1.5%) and 2012–2013 (2.9%), nearly doubling between the 2 surveys (Table 2).Within population subgroups, increases between 2001–2002 and 2012–2013 were statistically significant with few exceptions. Groups in which the magnitude of increase was most notable included those aged 45 to 64 years (0.4% vs 1.3%); black individuals (1.8% vs 4.6%); Hispanic individuals (1.2% vs 2.8%); those with the lowest income (2.3% vs 5.4%); and those in the South (1.0% vs 2.6%).
