Table 1.
Demographic and Substance Use Characteristics by Group at Night 1
| Controls (n=20) M (SD) or % [range] | Substance Users (n=29) M (SD) or % [range] | t-value/χ2(df) | |
|---|---|---|---|
| Age | 18.4 (1.2) [16.3–21.4] | 18.2 (1.1) [16.4–20.9] | 0.84 (47) |
| Female | 40% | 24% | 1.40 (1) |
| Non-White | 40% | 48% | 4.1 (5) |
| Socioeconomic status (Hollingshead) | 29.0 (17.0) [11.0–77.0] | 29.2 (12.6) [11.0–58.0] | −0.03 (47) |
| Beck Depression Inventory-II (BDI-II) | 2.2 (2.4) [0.0–7.0] | 2.7 (2.9) [0.0–12.0] | −0.03 (47) |
| State-Trait Anxiety Inventory (STAI) | 37.5 (4.3) [30.0–49.5] | 38.2 (4.8) [30.0–47.5] | −0.72 (47) |
| Smoked cigarettes/month, past month** | 0.1 (0.2) [0.0–1.0] | 4.2 (7.5) [0.0–30.0] | −2.99 (47) |
| Apnea Hypopnea Index† | 0.5 (1.1) [0.0 – 4.2] | 0.4 (0.6) [0.0 – 2.1] | 0.20 (47) |
| Fagerstrom Test of Nicotine Dependence | 0.0 (0.0) | 0.17 (0.5) | −1.43 (47) |
| Marijuana hits/month, past month*** | 0.0 (0.0) | 204.1 (232.1) [9.0–837.0] | −3.92 (47) |
| Lifetime marijuana use episodes*** | 0.50 (1.2) [0.0–4.0] | 582.7 (382.4) [200.0–1800.0] | −6.79 (47) |
| Days since last marijuana use***‡ | 448.5 (260.5) [157.0–672.0] | 1.9 (1.6) [1.0–8.0] | 10.2 (30) |
| Drinks/month, past month*** | 2.4 (4.5) [0.0–14.0] | 39.4 (41.3) [10.0–806.0] | −3.98 (47) |
| Lifetime alcohol use episodes*** | 26.0 (46.0) [0.0–196.0] | 214.4 (207.8) [0.0–150.0] | −3.98 (47) |
| Days since last drink**‡ | 118.8 (176.7) [6.0–649.0] | 11.4 (39.3) [1.0–211.0] | 3.10 (39) |
| Other drug use/month, past month***∞ | 0.0 (0.0) | 1.1 (1.8) [0.0–9.0] | −3.05 to –2.05 (47) |
| Lifetime other drug use episodes**∞ | 0.0 (0.0) | 7.8 (8.7) [0.0–30] | −2.77 to –2.22 (47) |
| Days since last other drug use‡ | -- | 135.6 (264.8) [6.0–1203.0] | -- |
**
t -test or chi-square p<.01
***
t -test or chi-square p<.001
‡
Only for those participants who reported use
∞
Includes stimulants, opioids, hallucinogens, and ecstasy
†
Collected on adaptation night (Night 1) only