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%).