Table 1.
Demographic characteristics of the three groups: SOL = solitary, RAP = research assistant present, and OPP = other participant present. Means (sem) or counts (percent of subjects) are shown. Quantities of use are calculated only for the participants who reported any use.
| SOL (N=10) | RAP (N=11) | OPP (N=12) | |
|---|---|---|---|
| Age (years) | 24.7 (2.7) | 25.7 (4.8) | 24.5 (3.3) |
| Education (years) | 14.4 (1.3) | 14.6 (1.3) | 15.5 (0.9) |
| Sex | |||
| Females | 2 (20%) | 3 (27%) | 4 (33%) |
| Males | 8 (80%) | 8 (73%) | 8 (67%) |
| Race | |||
| Caucasian | 7 (70%) | 6 (55%) | 9 (75%) |
| African | 1 (10%) | 3 (27%) | 2 (17%) |
| Hispanic | 1 (10%) | 2 (18%) | 1 (8%) |
| Asian | 1 (10%) | 0 | 0 |
| Caffeine | |||
| Daily Users | 6 | 7 | 8 |
| Cups/day | 1.7 (.52) | 1.9 (1.2) | 1.8 (.95) |
| Nicotine | |||
| Daily Users | 2 | 2 | 4 |
| Cigs/day | 6.3 (7.4) | 5.3 (2.5) | 2.4 (1.1) |
| Alcohol | |||
| Weekly (N) | 10 | 10 | 11 |
| Days/week | 2.1 (.72) | 2.8 (1.2) | 3.4 (1.6) |
| Drinks/drinking day | 4.6 (3.0) | 4.1 (2.4) | 2.9 (1.2) |
| MDMA | |||
| Lifetime use | 14.5 (22.2) | 18.4 (13.1) | 20.9 (21.5) |
| Cannabis | |||
| Ever users | 2 | 5 | 6 |
| Occasions/month | 7.5 (3.5) | 15.9 (10.6) | 6.1 (4.0) |
| Tranquilizers (recreational) | |||
| Ever used | 6 | 5 | 7 |
| Lifetime uses | 18.2 (40) | 2.2 (2.7) | 22.4 (24) |
| Stimulants (recreational) | |||
| Ever used | 9 | 7 | 9 |
| Lifetime uses | 34 (34) | 22 (35) | 29 (44) |
| Opiates (recreational) | |||
| Ever used | 8 | 3 | 7 |
| Lifetime uses | 19 (28) | 6.8 (5) | 33 (42) |
| Hallucinogens | |||
| Ever used | 7 | 9 | 11 |
| Lifetime uses | 8.9 (8.9) | 10.1 (12.9) | 21.2 |