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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/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

 

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