Table 1.
Demographic and clinical characteristics of methamphetamine-dependent and healthy subjects.
| Characteristics | Methamphetamine group (n = 37) | Control group (n = 25) |
|---|---|---|
| Demographic characteristics | ||
| Age, years: mean (sd) | 34.8 (6.0) | 32.8 (6.0) |
| Gender, male:female | 27:10 | 16:9 |
| Social alcohol drinkinga: no. (%) | 28 (75.7) | 16(64.0) |
| Pack-years of cigarette smoking: mean (sd) | 8.92(10.8) | 3.25 (6.15) |
| Methamphetamine use-related characteristics | ||
| Intravenous use, n | 37 | |
| Age at the first use of methamphetamine,b years: mean (sd) | 22.7 (5.6) | |
| Average daily dose of methamphetamine,c g: mean (sd) | 0.55 (0.46) | – |
| Duration of regular methamphetamine use,d months, mean (sd) | 63.3 (48.5) | – |
| Addiction severity indexe: mean (sd) | ||
| Medical | 0.21 (0.29) | – |
| Employment | 0.64 (0.32) | – |
| Alcohol | 0.15(0.21) | – |
| Drug | 0.07 (0.06) | – |
| Legal | 0.18(0.20) | – |
| Family | 0.19(0.16) | – |
| Psychosocial | 0.21 (0.22) | – |
a
Social alcohol drinking was defined as more than 8 g of ethanol per week. None of subjects had a history of alcohol abuse or dependence.
b
Data from 4 subjects were not available.
c
Data from 1 subject was not available.
d
Duration of regular methamphetamine use was calculated by summing up the time when methamphetamine was used more frequently than weekly. Data from 4 subjects were not available.
e
Data from 6 subjects were not available.