Table 2. General characteristics of sample.

Variable	Category	Frequency	%
Gender	Female	208	48.9
	Male	217	51.1
Age	20s′	193	45.4
	30s′	68	16.0
	40s′	48	11.3
	50s′	87	20.5
	over 60s′	29	6.8
The highest level of education	High school	144	33.9
	College	36	8.5
	University	179	42.1
	Graduate school	66	15.5
Occupation	Student	134	31.5
	Businessman	73	17.2
	Profession	46	10.8
	Self-employed	31	7.3
	Housewife	21	4.9
	Government employee	44	10.4
	Others	76	17.9
Average monthly income	Under1,000,000won	159	37.4
	Less than2,000,000won	75	17.6
	Less than3,000,000won	97	22.8
	Less than4,000,000won	40	9.4
	Less than5,000,000won	27	6.4
	Over6,000,000won	27	6.4