Table 1.
Prevalence of DSM-IV-defined dependence in adulthood (waves 7 to 10).
| Wave | Cannabis dependence | |||||||
|---|---|---|---|---|---|---|---|---|
| Males | Females | |||||||
| No. | Average age, years | N | n | % | 95% CI | n | % | 95% CI |
| 7 | 20.7 | 1594 | 83 | 10.6 | 8.1 to 13.6 | 40 | 4.3 | 2.9 to 6.2 |
| 8 | 24.1 | 1517 | 72 | 8.7 | 6.5 to 11.6 | 30 | 3.3 | 2.1 to 5.0 |
| 9 | 29.1 | 1387 | 31 | 4.3 | 2.8 to 6.6 | 21 | 2.1 | 1.2 to 3.7 |
| 10 | 35.1 | 1345 | 22 | 2.5 | 1.4 to 4.3 | 10 | 1.6 | 0.9 to 3.0 |
| Any adult wave | 1755 | 136 | 16.5 | 14.1 to 19.2 | 69 | 7.4 | 5.9 to 9.3 | |
DSM-IV = Diagnostic and Statistical Manual of Mental Disorders (Fourth Edition).