Table 1.

Descriptive data of participants

Variables		Frequency (n = 6248)	%
Gender
	Male	1871	29.9
	Female	4366	69.9
	Missing data	11	0.2
Age group
	below 20 years old	3187	51.0
	21–30 years old	2336	37.4
	31–40  years old	469	7.5
	41–50 years old	157	2.5
	51–60 years old	67	1.1
	above 60 years old	11	0.2
	Missing data	21	0.3
Occupation
	Students	4770	76.3
	Professional/technical works	402	6.4
	Administrative and clerical work	138	2.2
	Armed forces	15	0.2
	Elementary occupations	5	0.1
	Plant and machine operators	4	0.1
	Service and sales sector	62	1.0
	Skilled agricultural	37	0.6
	Self-employed	38	0.6
	Retired	15	0.2
	Unemployed	165	2.6
	Missing data	597	9.7
Highest education level
	No formal education	12	0.2
	Primary	91	1.5
	Secondary	1824	29.2
	Post-secondary (diploma, certificate, etc.)	1794	28.7
	Tertiary	2527	40.4
Member of any medical nongovernmental organizations (NGO)?
	Yes	697	11.2
	No	5420	86.7
	Missing data	131	2.1