Table 5.
Baseline and follow-up substance use–related measures.
| Variables | Baseline | Follow-up | |
| Motivationa, confidencea, and perceived risk, mean (SD) | |||
|
|
Intention to reduce alcohol | 2.4 (2.3) | 2.8 (2.5) |
|
|
Importance of reducing alcohol | 2.3 (1.9) | 2.7 (1.5) |
|
|
Confidence in ability to reduce alcohol use | 8.3 (2.2) | 8.2 (2.2) |
|
|
Intention to reducing cannabis use | 3.2 (3.3) | 2.8 (3.1) |
|
|
Importance of reducing cannabis use | 2.4 (2.5) | 2.3 (2.4) |
|
|
Confidence in ability to reduce cannabis use | 8.6 (2.1) | 8.9 (2.0) |
|
|
Perceived risk of regular alcohol use | 2.5 (0.9) | 2.5 (1.0) |
|
|
Perceived risk of regular cannabis use | 1.3 (0.9) | 1.3 (1.0) |
| Substance use and consequences, mean (SD) | |||
|
|
Weekly number of alcoholic drinks | 7.5 (6.1) | 6.7 (6.4) |
|
|
Weekly cannabis consumption (grams) | 0.5 (1.0) | 0.3 (0.7) |
|
|
Number of binge-drinking episodes (past-month) | 3.5 (3.3) | 3.1 (3.2) |
|
|
Substance use consequences (past-month) | 8.5 (6.7) | 7.7 (6.8) |
|
|
Drinking and driving events (past-month) | 2.5 (2.8) | 1.7 (2.6) |
|
|
Cannabis and driving events (past-month) | 1.6 (3.4) | 0.7 (1.3) |
an=38 for the alcohol importance ruler and n=18 for the cannabis importance ruler. Those who stopped drinking (n=2) or using cannabis (n=1) at follow-up and therefore did not complete ratings of intention, importance, and confidence of change at follow-up were recorded as 10 for each variable.