From: Gray-matter structure in long-term abstinent methamphetamine users
 | Controls (n = 86) | MA users (n = 99) | X2/T | p |
---|---|---|---|---|
Sex, n, male/female | 49/37 | 51/48 | 0.55 | 0.457 |
Ethnicity, n, Chinese Han /Others | 80 /6 | 98 /1 | Fisher’s exact p value | 0.051 |
Smokers, n, no /yes | 75 /11 | 29 /70 | 63.5 | < 0.001 |
Age at time of study, yr | 28.55 ± 8.56 (18–46) | 26.95 ± 6.22 (19–50) | 1.43 | 0.154 |
Full-time education, yr | 14.58 ± 3.64 | 8.76 ± 2.95 | 11.839 | < 0.001 |
Duration of MA use, months |  | 56.49 ± 35.54 (3–142) |  |  |
Abstinence before MRI scan, days |  | 240.96 ± 182.68 (12–621) |  |  |
Age at onset of MA use, yr |  | 21.73 ± 6.65 |  |  |
History of other substance use, n a | Â | 27 | Â | Â |
MDMA/ Ketamine / Both | Â | 2/21/4 | Â | Â |