Table 1.
Sample characteristics at baseline for each study and for the combined analytic sample.
| AR 1 (n=41) | AR 2 (n=104) | VT (n=49) | χ2 or F | Combined (N=194) | |
|---|---|---|---|---|---|
| Mean age | 16.0 (SD=1.2) | 15.7 (SD=1.4) | 15.9 (SD=1.1) | 1.2 | 15.8 (SD=1.3) |
| Hollingshead 9-step SES | 6.8 (SD=2.1) | 5.0 (SD=2.5) | 6.9 (SD = 1.8) | 16.0* | 5.9 (SD=2.1) |
| Gender (Male) | 68.3% | 85.6% | 83.7% | 6.0* | 81.4% |
| Ethnicity (Hispanic) | 2.4% | 1.9% | 0% | 0.1 | 2.1% |
| Race (White) | 85.4% | 33.7% | 89.8% | 58.5* | 60.3% |
| Cannabis Dependencea | 51.2% | 26.0% | 42.9% | 9.7* | 35.6% |
| Cannabis Abusea | 39.0% | 74.0% | 44.9% | 20.6* | 59.3% |
| % Days Cannabis Use | 43.2% | 37.5% | 50.3% | 2.6 | 41.9% |
| Mean Cannabis Uses per Day | 2.0 (SD=1.4) | 1.7 (SD=1.0) | 1.8 (SD=1.4) | 0.8 | 1.8 (SD=1.2) |
| Alcohol Dependencea | 19.5% | 0% | 0% | 31.1* | 4.1% |
| Alcohol Abusea | 39.0% | 4.8% | 20.4% | 26.6* | 16.0% |
| Mean Drinks per Day | 6.0 (SD=4.2) | 1.9 (SD=3.1) | 3.8 (SD=4.4) | 18.2* | 3.2 (SD=4.1) |
*
p<0.05
a
Based on youth interview.