Table 2.
Substance use characteristics at baseline (ages 12–17) and follow-up (ages 15–21).
| Controls (n = 20) |
Heavy drinkers (n = 20) |
|||
|---|---|---|---|---|
| M | SD | M | SD | |
| Baseline | ||||
| Lifetime drinks | 1.05 | 4.47 | 1.20 | 2.71 |
| Lifetime cannabis use occasions | 0.25 | 1.12 | 0.05 | 0.22 |
| Lifetime other drug use occasions | 0.00 | 0.00 | 0.00 | 0.00 |
| Follow-up | ||||
| Lifetime alcohol use occasions** | 1.75 | 6.46 | 67.40 | 55.25 |
| Peak drinks on an occasion, past year** | 0.50 | 1.24 | 10.90 | 5.16 |
| Average drinks per occasion, past month** | 0.33 | 0.97 | 4.73 | 2.32 |
| Days since last alcohol use** | 119.25 | 89.36 | 37.10 | 66.65 |
| Cigarettes per day, past month | 0.00 | 0.00 | 0.20 | 0.62 |
| Lifetime cannabis use occasions** | 0.35 | 1.14 | 26.55 | 65.70 |
| Cannabis use days, past month** | 0.00 | 0.00 | 2.40 | 6.10 |
| Used cannabis >5 times (%)** | 0% | 20% | ||
| Lifetime other drug use occasions | 0.00 | 0.00 | 0.70 | 2.45 |
Note: Other drugs included: amphetamines, barbiturates, hallucinogens, cocaine, inhalants, opiates, spice, benzodiazepines, ecstasy, ketamine, gamma hydroxybutyrate, and other misused prescription medications.
**
Continuous controls ≠ heavy drinkers, p < .01.