Table 1.
Demographic and Psychiatric Characteristics of the Study Participants
| Variable | MA− (n = 110) | MA+ (n = 114) | p |
|---|---|---|---|
| Demographic Characteristics | |||
| Age (years) | 37.6 (12.4) | 37.3 (9.3) | 0.83 |
| Education (years) | 12.4 (1.9) | 11.9 (2.3) | 0.11 |
| Sex (% men) | 63.6 | 70.2 | 0.30 |
| Ethnicity (% Caucasian) | 69.1 | 76.3 | 0.26 |
| Estimated verbal IQ a | 99.9 (10.5) | 97.5 (9.5) | 0.07 |
| Hepatitis C Infection (% seropositive) | 21 (20.4%) | 36 (31.6%) | 0.06 |
| Psychiatric Characteristics b | |||
| Major Depressive Disorder (%) | |||
| Current | 7.3 | 6.1 | 0.79 |
| Lifetime | 31.8 | 30.7 | 0.89 |
| Bipolar Disorder(%) | |||
| Current | 0.0 | 4.4 | 0.06 |
| Lifetime | 0.9 | 6.1 | 0.07 |
| ADHD | |||
| Current | 0.9 | 10.0 | 0.005 |
| Lifetime | 2.8 | 15.5 | 0.002 |
| ASPD | 0.0 | 23.7 | <0.001 |
| Methamphetamine Use Characteristics c | |||
| Last use (days since last use) | -- | 91 (45, 167) | -- |
| Cumulative duration of use (days of use) | -- | 3960 (2130, 5826) | -- |
| Cumulative quantity of use d | -- | 2908.0 (1180.0, 5833.0) | -- |
| Duration of use in last 30 days (days) | -- | 3.0 (2.0, 8.0) | -- |
| Quantity used in last 30 days d | -- | 3.0 (0.3, 6.0) | -- |
| Quantity used in last 12 months d | -- | 136.8 (18.0, 540.0) | -- |
| Other Substance Use Disorders e | |||
| Canabis dependence | 8.2 | 19.3 | 0.02 |
| Opioid dependence | 5.5 | 4.4 | 0.77 |
| Cocaine dependence | 6.4 | 18.4 | 0.02 |
| Alcohol dependence | 15.5 | 41.2 | <0.001 |
| Other substance dependence f | 1.8 | 1.8 | 0.97 |
| POMS Total Mood Disturbance g | 51.9 (35.6) | 64.4 (39.8) | 0.014 |
Note.
a
Based on the WRAT-3 Reading Standard Score;
b
p-values based on Fisher’s Exact Test;
c
data presented as medians and IQRs;
d
quantity of MA used presented in grams;
e
lifetime diagnoses;
f
other substance dependence = hallucinogens and sedatives; and
g
POMS = Profile of Mood States.