Table 1.
Characteristics of Adolescent Participants
| Characteristic | MJ (n = 17) | Controls (n = 17) |
|---|---|---|
| Age in years (range = 16–18) | 18.06 (0.75) | 17.9 (1.12) |
| Female (%) | 18 | 29 |
| Family history negative (%)a | 53 | 77 |
| CBCL Externalizing t score | 47.31 (5.73) | 44.48 (7.05) |
| CBCL Internalizing t score | 46.74 (7.57) | 46.89 (8.83) |
| Beck Depression Inventory | 4.41 (7.07) | 1.76 (2.59) |
| Spielberger State Anxiety t score | 38.04 (8.39) | 40.74 (10.20) |
| Parent annual salary (thousands of dollars) | 116.35 (84.03) | 121.00 (73.50) |
| WASI Vocabulary t score | 55.53 (8.74) | 55.53 (7.93) |
| WASI Block Design t score | 59.82 (5.67) | 54.35 (11.19) |
| Lifetime alcohol use episodes | 147.35 (125.26)* | 9.94 (30.71) |
| Average cigarettes per day | 1.59 (1.67) | 0.35 (7.21) |
| Lifetime marijuana use episodes | 477.06 (260.07)* | 0.53 (1.33) |
Note. Except as indicated, data are means (SD). MJ = marijuana using teens with 28 days of abstinence; CBCL = Child Behavior Checklist; WASI = Wechsler Abbreviated Scale of Intelligence.
a
No first-degree biological relative with alcohol or drug abuse or dependence.
*
p <.0001.