Table 1.
Participant characteristics
| MJ (n = 15) M (S.D.) or % |
Controls (n = 17) M (S.D.) or % |
|
|---|---|---|
| Age | 18.1 (0.7) | 17.9 (1.0) |
| % Female | 26.7 | 29.4 |
| % Caucasian | 73.3 | 58.8 |
| % Family history negative a | 66.7 | 76.5 |
| CBCL Externalizing T-score | 48.0 (6.2) | 44.9 (7.3) |
| CBCL Internalizing T-score | 49.0 (6.7) | 46.1 (9.2) |
| Beck Depression Inventory total | 4.9 (7.2) | 1.2 (2.0) |
| Hamilton Depression Score * | 4.5 (6.0) | 0.9 (2.0) |
| Spielberger State Anxiety T-score | 58.1 (2.8) | 57.4 (2.8) |
| Hamilton Anxiety Score * | 2.7 (3.7) | 0.1 (0.5) |
| Parent annual salary (thousands) | 138.9 (86.7) | 131.7 (65.3) |
| WASI Vocabulary scaled score | 54.8 (9.4) | 55.8 (7.6) |
| Years since first marijuana use b | 4.0 (1.6) | 3.6 (0.8) |
| Years since first weekly marijuana use ** |
2.7 (1.8) | 0.0 (0.0) |
| Lifetime marijuana use episodes ** |
480.7 (277.2) | 0.5 (1.3) |
| Marijuana use/month, past 3 months ** |
13.5 (11.6) | 0.0 (0.0) |
| Days since last marijuana use b, * | 60.4 (54.1) | 608.3 (210.7) |
| Lifetime drinks ** | 184.1 (135.0) | 15.1 (38.8) |
| Drinks/month, past 3 months ** | 34.2 (22.1) | 2.7 (9.4) |
| Days since last alcohol use c, * | 44.0 (63.4) | 167.8 (146.4) |
| Tobacco cigarettes per day | 1.3 (2.7) | 0.8 (2.6) |
| Days since last cigarette use d, * | 36.1 (67.8) | 475.5 (426.5) |
| FTND total (max = 10) | 0.3 (0.8) | 0.1 (0.2) |
| Lifetime other drug use episodes * | 6.7 (8.8) | 0.0 (0.0) |
| Narcotic pain pills * | 3.7 (6.8) | 0.0 (0.0) |
| Hallucinogens * | 1.9 (2.7) | 0.0 (0.0) |
| Amphetamines | 0.4 (1.3) | 0.0 (0.0) |
| Inhalants | 0.2 (0.8) | 0.0 (0.0) |
| Ketamine | 0.1 (0.3) | 0.0 (0.0) |
| Benzodiazepines | 0.1 (0.3) | 0.0 (0.0) |
| Cocaine | 0.1 (0.4) | 0.0 (0.0) |
| MDMA | 0.1 (0.3) | 0.0 (0.0) |
| PCP | 0.1 (0.3) | 0.0 (0.0) |
| Barbiturates | 0.0 (0.0) | 0.0 (0.0) |
MJ: 28-day-abstinent marijuana-using teens; CBCL: Child Behavior Checklist; WASI: Wechsler Abbreviated Scale of Intelligence; FTND: Fagerstrom Test for Nicotine Dependence.
a
No first-degree biological relative with alcohol or drug abuse or dependence.
b
Figure includes only those who reported history of use (n = 3 controls).
c
Figure includes only those who reported history of use (n = 9 controls).
d
Figures include only those who reported history of use (n = 12 MJ teens and n = 4 controls).
*
P < 0.05.
**
P < 0.001.