Overall (annual average), 13.39% of past-year cannabis users met criteria for a CUD (4.58% abuse, 8.81% dependence). Cannabis dependence was consistently more prevalent than abuse. Except for whites, there were little yearly variations in the prevalence of cannabis abuse and dependence among cannabis users during 2005–2013. The test for yearly trend was significant for CUD among white cannabis users, suggesting a declining prevalence in abuse or dependence (P<0.01). Across years, black and native-American cannabis users showed a pattern of a higher prevalence of cannabis dependence than white cannabis users. In 2013, the CUD prevalence among cannabis users was higher among black users (16.82%, 95% CI=13.14–21.28%) and native-American users (20.40%, 95% CI=11.96–32.60%) than white users (10.01%, 95% CI=8.57–11.66%) (Figure 1b).
