Table 1.
Sample demographics
| Group variable | Mean | SD | Percent | Number |
|---|---|---|---|---|
| Age (years) | 16.0 | 1.4 | ||
| Gender (female) | 61.7 | 261 | ||
| Grade | ||||
| 9th | 28.4 | 120 | ||
| 10th | 18.7 | 79 | ||
| 11th | 23.0 | 97 | ||
| 12th | 29.9 | 126 | ||
| Race | ||||
| White | 42.1 | 179 | ||
| Asian | 5.2 | 22 | ||
| Black/African American | 24.9 | 106 | ||
| Mixed race | 8.9 | 38 | ||
| Other | 18.8 | 80 | ||
| Ethnicity (% Latino/Hispanic) | 32.2 | 137 | ||
| Lifetime alcohol user (% yes) | 52.7 | 224 | ||
| Past 30-day drinking days | 1.3 | 2.7 | ||
| Lifetime alcohol problemsa | 5.1 | 9.0 | ||
| Alcohol use intentions | −1.3 | 1.0 | ||
| Lifetime marijuana user (% yes) | 40.5 | 172 | ||
| Lifetime marijuana problemsa | 1.9 | 2.7 |
a
Represents frequency of problems experienced among lifetime users only. An intentions score of −1 corresponds to a response of “I will probably not drink” in the next month, alcohol problems could range from 0 to 54, and marijuana problems from 0 to 9