Table 1.
Demographic and Psychiatric Characteristics of Study Participants
| Variable | MA− (n = 85) | MA+ (n = 73) | p |
|---|---|---|---|
| Demographic Characteristics | |||
| Age (years) | 43.6 (12.2) | 41.5 (8.20) | 0.21 |
| Education (years) | 12.7 (1.8) | 12.4 (1.9) | 0.29 |
| Sex (% men) | 76.5 | 86.3 | 0.12 |
| Ethnicity (% Caucasian) | 52.9 | 63.0 | 0.28 |
| Estimated verbal IQ a | 47.8 (8.6) | 47.9 (7.9) | 0.89 |
| Hepatitis C Infection (% seropositive) | 19.7 | 28.6 | 0.23 |
| Psychiatric Characteristics b | |||
| Major Depressive Disorder (%) | |||
| Current | 4.6 | 11.6 | 0.13 |
| Lifetime | 28.8 | 39.1 | 0.20 |
| ADHD | 1.2 | 9.7 | 0.02 |
| ASPD | 9.2 | 20.1 | 0.07 |
| Methamphetamine Use Characteristics c | |||
| Last use (days) | -- | 152.1 (150.5) | -- |
| Cumulative duration of use (days of use) | -- | 3816.3 (3003.9) | -- |
| Cumulative quantity of use d | -- | 4836.0 (7041.0) | -- |
| Onset age (LT dependence) | -- | 25.9 (8.4) | -- |
| Recency age (LT dependence) | -- | 39.5 (8.7) | -- |
| Age of first use (years) | -- | 21.8 (7.6) | -- |
| Other Substance Use Disorders e | |||
| Cannabis dependence | 4.7 | 19.2 | 0.004* |
| Opioid dependence | 4.7 | 4.1 | 0.86 |
| Cocaine dependence | 9.4 | 21.9 | 0.03* |
| Alcohol dependence | 14.1 | 32.9 | 0.005* |
| Other substance dependence f | 0.0 | 1.8 | 0.97 |
Note.
a
Based on the WRAT-3 Reading Standard Score;
b
p-values based on Fisher’s Exact Test;
d
quantity of MA used presented in grams;
e
lifetime diagnoses;
f
other substance dependence = hallucinogens and sedatives.