Subject characteristics for marijuana nonusers and daily users in adult and adolescent samples based on the past 60 and 90 d, respectively
| Adults | Adolescents | |||||
|---|---|---|---|---|---|---|
| Nonusers (N = 29) | Daily users (N = 29) | Significance | Nonusers (N = 50) | Daily users (N = 50) | Significance | |
| Sex | ||||||
| Males | 16 | 16 | 36 | 41 | ||
| Females | 13 | 13 | 14 | 9 | 0.235 | |
| Age (years) | 27.5 (6.8) | 27.4 (7.1) | 0.985 | 16.77 (0.95) | 16.65 (1.09) | 0.538 |
| Age range (years) | 18–53 | 19–53 | 14–18 | 14–18 | ||
| Educationa | 13.5 (1.8) | 13.5 (1.7) | 0.966 | 9.08 (0.98) | 9.16 (1.33) | 0.739 |
| AUDIT score | 11.9 (7.5) | 11.9 (6.1) | 0.986 | 7.38 (7.00) | 8.10 (5.79) | 0.577 |
| AUDIT consumption score | 6.7 (3.0) | 7.1 (3.0) | 0.691 | 4.06 (3.40) | 4.52 (2.87) | 0.466 |
| Substance useb | ||||||
| Alcohol (n) | ||||||
| Drinking days | 12.31 (21.47) | 12.97 (18.26) | 0.869 | |||
| Heavy drinking days | 12.2 (10.8) | 16.8 (15.0) | 0.185 | |||
| Drinks per drinking day | 4.6 (2.5) | 5.7 (3.6) | 0.216 | 5.19 (5.46) | 5.42 (5.26) | 0.831 |
| Cigarettes (n) | ||||||
| Smoking days | 35.2 (28.8) | 46.1 (25.2) | 0.127 | |||
| Cigarettes per smoking day | 7.7 (8.3) | 10.9 (8.2) | 0.371 | 3.09 (4.66) | 3.60 (3.70) | 0.546 |
| Marijuana (n) | ||||||
| Smoking days | 0b | 60 | <0.001 | 0b | 90 | <0.001 |
| Ethnicity (n) | ||||||
| Caucasian | 13 | 14 | 10 | 5 | ||
| Latino | 6 | 5 | 30 | 34 | ||
| Native American | 3 | 3 | 1 | 3 | ||
| African American | 4 | 3 | ||||
| Asian/Pacific Islander | 1 | 1 | ||||
| Mixed | 4 | 1 | 3 | 4 | ||
| Unknown | 3 | 6 | 1 | |||
| Depressionc | 9.06 (7.79) | 9.00 (6.20) | 0.983 | 2.78 (2.81) | 3.58 (3.53) | 0.213 |
| Anxietyd | 8.17 (11.14) | 12.63 (10.35) | 0.158 | |||
| IMPSS | ||||||
| IMP | 3.32 (2.47) | 2.85 (2.03) | 0.445 | 3.84 (2.22) | 4.08 (2.10) | 0.579 |
| SS | 7.36 (2.70) | 6.67 (2.71) | 0.444 | 7.82 (2.44) | 7.56 (2.38) | 0.591 |
Data are mean (SD), unless otherwise indicated. IMP, Impulsivity subscale; SS, sensation-seeking subscale.
↵aHighest grade completed for adults and current grade at study screening for adolescents.
↵bTimeLine Follow Back for past 60 d for adults and variables adapted from White and Labouvie (1989) for the past 90 d for adolescents.
↵cBeck Depression Inventory for adults and Children's Depression Inventory for adolescents.
↵dBeck Anxiety Inventory for adults; no measure available for adolescents.