Table 1.
Background characteristics (n = 308)
| Mean (±SD) | Median | Range | |
|---|---|---|---|
| Age (years) | 20.40 (1.74) | 20.0 | 18–25 |
| Age first used marijuana | 14.75 (2.18) | 15.0 | 8–21 |
| Days (past 90) used marijuana | 51.23 (30.37) | 50.5 | 3–90 |
| Days (past 90) used alcohol | 18.68 (16.32) | 14.0 | 0–80 |
| Impulsivity | 10.99 (3.76) | 11.0 | 5–20 |
| n (%) | |
|---|---|
| Race/ethnicity | |
| Caucasian (non-hispanic) | 206 (66.9%) |
| African-American | 35 (11.4%) |
| Hispanic | 34 (11.0%) |
| Other minority | 33 (10.7%) |
| Some college or degree (yes) | 207 (67.2%) |
| Employed (yes) | 188 (61.0%) |
| Marital status | |
| Single/never married | 297 (96.4%) |
| Married | 7 (2.3%) |
| Separated/divorced | 3 (1.0%) |
| Living w partner | 1 (0.3%) |
| Recent (90 days) cocaine use (yes) | 46 (14.9%) |
| Highest risk categorya | |
| Protected w main | 22 (7.1%) |
| Unprotected w main | 167 (54.2%) |
| Protected w casual | 65 (21.1%) |
| Unprotected w casual | 54 (17.5%) |
a
Highest risk behavior observed at any time during the 90-day period assessed by TLFB