Table 1. Demographic Data of Subjects Involved in the Study ^a.

Subjects	Dependent Group b	Control Group b
Gender
Male	316 (97.5)	64 (92.8)
Female	8 (2.5)	5 (7.2)
Age, y
< 20	34 (10.5)	14 (20.3)
≥ 20 - < 30	176 (54.3)	27 (39.1)
≥ 30 - < 40	65 (20.1)	21 (30.4)
≥ 40	49 (15.1)	7 (10.1)
Age, y c	26.5 (23 - 34)	27 (20.5 - 34.5)

^a Dependent group involves subjects determined as at least one or more than one type of psychoactive substance users. In the control group urine toxicology results were negative.

^b Values are presented as No (%).

^c Median (Quartiles).