Table 1 Demographic data and drug use (means and standard deviations).

(n = 29)

(n = 21)

Female/male

10/19

5/16

χ² = 0.66

1

0.416

Age

26.6 (8.1)

28.7 (10.4)

t = −0.83

48

0.411

Years of education

11.5 (1.5)

11.1 (2.0)

t = 0.67

35.6

0.507

Ethnicity

White/European

29

17

Black/African-European^a

0

2

Asian

0

0

Hispanic/Latino^a

0

2

Verbal IQ

105.2 (11.3)

106.4 (11.2)

t = −0.37

50

0.717

BDI sum score

3.0 (3.3)

9.8 (7.9)

t = −4.16

48

<0.001

BMI

22.2 (2.6)

24.1 (3.5)

t = −1.95

48

0.058

Smoking y/n

18/11

15/6

χ² = 0.48

1

0.490

Cigarettes/week^b

45.4 (35.7)

87.8 (57.7)

t = −2.50

22.5

0.021

Alcohol y/n

27/2

19/2

χ² = 0.11

1

0.735

Alcohol gram/week^b

74.8 (64.9)

61.0 (64.4)

t = 0.71

44

0.479

Opioid use

Times per week

–

3.9 (3.1)

ME mg/week

–

586.2 (1001)

Years of use^c

–

2.9 (0.5–28.0)

Last opioid used in hours^c

–

24.0 (1–729.6)

OUD in percentage^d

76

Craving (NRS)

–

3.3 (2.6)

Opioid withdrawal (OOWS)

–

1.0 (2.1)

Positive urine tests y/n

0/29

10/11

ME hair concentration pg/mg

1 (4)

5084 (7314)

Cannabis use

Cannabis use y/n

9/20

13/8

χ² = 4.71

1

0.030

g/week^b

0.21 (0.5)

0.62 (0.7)

U = 25.0

0.025

Years of use^b

4.50 (3.1)

1.87 (1.6)

U = 24.0

0.020

Positive urine tests (y/n)

0/29

5/16