Table 1.

Descriptive statistics.

Variable	Categories	Frequency	Percent
Gender	Male	81	35.22
	Female	149	64.78
Student	Freshman	35	15.21
	Sophomore	76	33.04
	Junior	78	33.91
	Senior	41	17.82
Monthly income	<5 m. VND	157	68.26
	5–9.9 m. VND	33	14.34
	10-14.9 m. VND	21	9.13
	>15 m. VND	19	8.26
Household size	1 per.	206	89.57
	2 per.	2	0.87
	3 per.	7	3.04
	4 per.	12	5.22
	5 per.	3	1.30
Origin	Ho Chi Minh City	27	11.74
	Otherwise	203	88.26