Table 1. General characteristics of the subjects (n=2,000)

Subjects Option Frequency (%)
Gender Male 1,017 (50.9)
Female 983 (49.2)
Age 20s 340 (17)
30–40s 696 (39.4)
50–60s 873 (43.7)
Marital status Married 1,292(64.6)
Single 705 (35.3)
Others 3 (0.2)
Number of children None 984 (49.2)
1 child 393 (19.7)
2 children 521 (26.1)
More than 3 children 102 (5.1)
Occupation Student 99 (4.9)
Retirement 122 (6.1)
Manufacturing worker 179 (9.0)
Professionals 182 (9.1)
Service and sales 190 (9.5)
Housewife 404 (20.2)
Office worker 762 (38.1)
Others 62 (3.1)
Monthly house income (10,000 won) <200 204 (10.2)
200–299 342 (17.1)
300–399 426 (21.3)
400–499 345 (17.3)
500–599 300 (15.0)
600–699 143 (7.2)
700–799 107 (5.4)
More than 800 133 (6.7)
Monthly food purchase frequency 1 70 (3.5)
2 159 (8.0)
3 256 (12.8)
4 340 (17.0)
5 351 (17.6)
More than 6 824 (41.2)
Monthly processed food purchase expenses (10,000 won)
<10 184 (9.2)
10–19 291 (14.6)
20–29 379 (19.0)
30–39 368 (18.4)
40–49 330 (16.5)
More than 50 448 (22.4)