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Table 1 Characteristics of the participants

From: Gray-matter structure in long-term abstinent methamphetamine users

 Controls (n = 86)MA users (n = 99)X2/Tp
Sex, n, male/female49/3751/480.550.457
Ethnicity, n, Chinese Han /Others80 /698 /1Fisher’s exact p value0.051
Smokers, n, no /yes75 /1129 /7063.5< 0.001
Age at time of study, yr28.55 ± 8.56 (18–46)26.95 ± 6.22 (19–50)1.430.154
Full-time education, yr14.58 ± 3.648.76 ± 2.9511.839< 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 27  
MDMA/ Ketamine / Both 2/21/4  
  1. a Total consumption of MA exceeded 90% of one’s total substance consumption (in number of administrations). All denied having used other substances including marijuana, cocaine, heroin, pethidine, morphine, methadone, codeine. During the abstinent period, smoking was limited to less than one cigarette per day, and alcohol was forbidden. MA: methamphetamine. MDMA: methylenedioxymethamphetamine