Table 1.

Sample characteristics.

Sample characteristics		Total (N = 298)		Male		Female
		M	SD	n	%	n	%
Age	Male (18–64)	37.5	9.5	–	–	–	–
	Female (19–55)	35.2	8.2	–	–	–	–
		n	%
Gender	1. Male	210	70.5	–	–	–	–
	2. Female	88	29.5	–	–	–	–
Education level: (n = 293)	1. Elementary school and below	49	16.4	35	16.7	14	15.9
	2. Middle school	125	41.9	87	41.4	38	43.2
	3. High school	88	29.5	61	29.0	26	29.5
	4. College	29	9.7	20	9.5	9	10.2
	5. Above college	2	0.7	2	1.0	0	0.0
Work status: (n = 289)	1. Unemployment	136	45.6	88	41.9	48	54.5
	2. Employment	134	45.0	108	51.4	25	28.4
	3. Others	19	6.4	11	5.2	8	9.1
Years of substance use: (n = 271)	<5 years	85	28.5	66	31.4	19	21.6
	6–10 years	94	31.5	62	29.5	32	36.4
	>10 years	91	30.5	57	27.1	34	38.6
Substance Classification	1. Heroin	82	27.5	60	28.6	22	25.0
	2. Methamphetamine	253	84.9	172	81.9	81	92.0
	3. Ketamine	53	17.8	30	14.3	23	26.1
	4. MDMA (ecstasy)	29	9.7	18	8.6	11	12.5
	5. Marihuana	33	11.1	19	9.0	14	15.9
	6. Others	8	2.7	6	2.9	2	2.3
Addiction severity	Mild	2	0.67	2	1.0	0	0.0
	Moderate	5	1.68	4	1.9	1	1.1
	Severe	291	97.65	204	97.1	87	98.9