Table 1.

Demographic characteristics

	Mean (SD)
Age (years)	39.3 (5.8)
Education (years)	12.5 (2.0)
Body mass index	24.6 (3.4)
Cigarettes smoked
Per day	13.4 (8.3)
Number of years	16.6 (10.2)
Alcoholic drinks consumed
Per week	1.2 (1.4)
Number of years	13.7 (6.9)
MA use
Number of days in the past 30 days	22.9 (9.7)
Number of years	15.3 (8.8)
Marijuana use
Number of days in the past 30 days	5.3 (11.2)
Number of years	10.8 (13.5)
Cocaine use
Number of days in the past 30 days	0.0 (0.0)
Number of years	1.9 (3.4)
Opioids use
Number of days in the past 30 days	0.0 (0.0)
Number of years	2.4 (6.0)
Hallucinogen use
Number of days in the past 30 days	0.0 (0.0)
Number of years	1.8 (1.8)
Sedatives use
Number of days in the past 30 days	0.0 (0.0)
Number of years	0.6 (0.9)

Notes: The demographic data are expressed as mean values for eight participants. The bracketed values indicate standard deviation.