Table 1.
Changes in the prevalence of cannabis use disorder a, cannabis dependence, and cannabis abuse among people reporting daily/almost daily cannabis use, by age group.
| Year | 12-17 years Prevalence (95% CI) | 18-25 years Prevalence (95% CI) | 26+ years Prevalence (95% CI) | |
|---|---|---|---|---|
| CUDa | ||||
| 2002-2003 | 64.5 (59.2, 69.5) | 45.4 (42.0, 48.7) | 25.1 (20.7, 30.2) | |
| 2015-2016 | 47.2 (39.7, 54.9) | 31.8 (28.9, 34.9) | 15.7 (13.6, 18.1) | |
| Difference 2002-2003 vs. 2015-2016 | −17.3* | −13.5* | −9.4* | |
| % Change | 26.8 | 29.7 | 37.5 | |
| Cannabis dependence | ||||
| 2002-2003 | 44.9 (39.2, 50.8) | 34.7 (31.8, 37.7) | 13.6 (10.1, 17.9) | |
| 2015-2016 | 25.2 (19.2, 32.4) | 25.4 (23.0, 27.8) | 12.0 (9.7, 14.6) | |
| Difference 2002-2003 vs. 2015-2016 | −19.7* | −9.3* | −1.6 | |
| % Change | 43.9 | 26.8 | 11.8 | |
| Cannabis abuse | ||||
| 2002-2003 | 55.0 (49.0, 60.8) | 30.3 (27.4, 33.4) | 16.3 (12.8, 20.4) | |
| 2015-2016 | 40.0 (32.6, 47.8) | 17.0 (14.4, 20.0) | 6.8 (5.7, 8.2) | |
| Difference 2002-2003 vs. 2015-2016 | −15.0* | −13.3* | −9.4* | |
| % Change | 27.3 | 43.9 | 57.7 |
a
CUD= cannabis use disorder, i.e., DSM-IV cannabis dependence or/and abuse
*
Significant at 95% confidence