Table 3.
Associations between outcome diagnostic status and lengths of times for transitions for alcohol, tobacco, and cannabis, controlling for age of use onset
| Transition from initiation | Experienced dependence | n | Mean length of time in mo | Median | p-value | |
|---|---|---|---|---|---|---|
| Tobacco | Regular use | Yes | 27 | 9.33 (19.50) | 0.00 | 0.72 |
| No | 222 | 9.62 (24.29) | 0.00 | |||
| First problem | Yes | 26 | 21.23 (27.43) | 12.00 | 0.44 | |
| No | 64 | 22.88 (26.25) | 12.00 | |||
| Alcohol | Regular use | Yes | 64 | 15.80 (23.16) | 0.00 | 0.06 |
| No | 276 | 19.37 (29.91) | 0.00 | |||
| First problem | Yes | 65 | 27.55 (24.39) | 24.00 | 0.87 | |
| No | 132 | 28.85 (30.18) | 24.00 | |||
| Cannabis | Regular use | Yes | 50 | 3.12 (6.78) | 0.00 | 0.16 |
| No | 171 | 5.19 (10.33) | 0.00 | |||
| First problem | Yes | 15 | 16.47 (19.19) | 12.00 | 0.26 | |
| No | 108 | 11.67 (17.55) | 0.00 |
Note: Problem onset was the age at which the first DSM-III-R abuse or dependence criterion was experienced. Dependence was based on having experienced DSM-III-R dependence related to the drug specified in the row (or not). Parenthetical values are standard deviations.