Table 1.
Demographic and clinical variables in 24 participantsa
| Control subjects (n = 12) |
METH abuser (n = 12) |
|||
|---|---|---|---|---|
| Mean (SD) | Range | Mean (SD) | Range | |
| Age (years) | 31.8 (3.4) | 29–35 | 31.0 (3.5) | 29–35 |
| Education (years) | 11.0 (1.5) | 9–12 | 10.7 (1.4) | 9–12 |
| Duration of methamphetamine use (years) | 6.8 (3.9) | 1.2–12.0 | ||
| Duration of methamphetamine abstinence (years) | 1.8 (1.4) | 0.5–4.0 | ||
| Scale for methamphetamine cravingb | 4.9 (3.4) | 1–10 | ||
| Aggression questionnaire scorec | 30.6 (1.6) | 29–34 | 63.8 (7.8*) | 54–80 |
aThe number of females and males in each group was four and eight, respectively.
bThe subjective Drug Effect Rating Scale for Cocaine (Volkow et al., 1997) was modified and used. The scores can range from 1 to 10, with higher scores representing more intense craving.
cHigher scores represent greater aggression (Buss and Perry, 1992).
*Significantly different from control subjects (p < 0.001 by Mann–Whitney U test).