Characteristics of subjects (affected/unaffected)
| Total | Affected | Unaffected | P value for χ2 | ||||
| N (%, weighted) | N (%, weighted) | N (%, weighted) | |||||
| Total | 41 605 | 15 499 | (35.85) | 26 106 | (64.15) | ||
| Monthly household income (unit: million KRW) | <0.001 | ||||||
| <1 (US$845) | 6117 | (8.61) | 3082 | (51.00) | 3035 | (49.00) | |
| (1–1.99) | 6910 | (13.15) | 2949 | (42.71) | 3961 | (57.29) | |
| (2–2.99) | 9077 | (21.85) | 3341 | (36.92) | 5736 | (63.08) | |
| (3–3.99) | 7820 | (21.00) | 2604 | (33.57) | 5216 | (66.43) | |
| ≥4 (US$3380) | 11 681 | (35.39) | 3523 | (30.30) | 8158 | (69.70) | |
| Age (years) | <0.001 | ||||||
| 19–29 | 4550 | (17.19) | 1670 | (37.55) | 2880 | (62.45) | |
| 30–39 | 8181 | (23.75) | 2640 | (31.99) | 5541 | (68.01) | |
| 40–49 | 10 505 | (26.67) | 3544 | (32.87) | 6961 | (67.13) | |
| 50–59 | 9203 | (20.22) | 3464 | (36.57) | 5739 | (63.43) | |
| 60–69 | 5507 | (8.07) | 2381 | (44.08) | 3126 | (55.92) | |
| ≥70 | 3659 | (4.10) | 1800 | (50.64) | 1859 | (49.36) | |
| Education level | <0.001 | ||||||
| ≤Middle school | 9123 | (12.25) | 4245 | (46.26) | 4878 | (53.74) | |
| Mid. sch. to Univ. | 23 376 | (59.68) | 8539 | (36.78) | 14 837 | (63.22) | |
| ≥University | 9106 | (28.07) | 2715 | (29.31) | 6391 | (70.69) | |
| Marital status | 0.002 | ||||||
| Single | 12 800 | (34.71) | 4933 | (37.41) | 7867 | (23.86) | |
| Married | 28 805 | (65.29) | 10 566 | (35.02) | 18 239 | (64.98) | |
| Number of household members | <0.001 | ||||||
| One | 4685 | (10.04) | 1825 | (37.67) | 2860 | (62.33) | |
| Two | 12 638 | (23.08) | 5105 | (38.77) | 7533 | (61.23) | |
| Three or more | 24 282 | (66.87) | 8569 | (34.56) | 15 713 | (65.44) | |
| Type of community | 0.001 | ||||||
| City (urban) | 24 078 | (80.75) | 8695 | (35.39) | 15 383 | (64.61) | |
| Town (rural) | 17 527 | (19.25) | 6804 | (37.77) | 10 723 | (62.23) | |
| High-risk alcohol drinking | <0.001 | ||||||
| Yes | 13 354 | (33.40) | 4562 | (33.43) | 8792 | (66.57) | |
| No | 28 251 | (66.60) | 10 937 | (37.06) | 17 314 | (62.94) | |
| Physical activity | 0.991 | ||||||
| No | 30 517 | (74.39) | 11 359 | (35.85) | 19 158 | (64.15) | |
| Yes | 11 088 | (25.61) | 4140 | (35.84) | 6948 | (64.16) | |
| Self-reported stress level | 0.197 | ||||||
| High | 13 118 | (34.75) | 4897 | (35.31) | 8221 | (64.69) | |
| Low | 28 487 | (65.25) | 10 602 | (36.13) | 17 885 | (63.87) | |
| Experience of depression | <0.001 | ||||||
| Yes | 2352 | (5.81) | 1064 | (42.96) | 1288 | (57.04) | |
| No | 39 253 | (94.19) | 14 435 | (35.41) | 24 818 | (64.59) | |
| Number of chronic diseases* | 0.003 | ||||||
| Two or more | 5811 | (12.54) | 2412 | (38.30) | 3399 | (61.70) | |
| One | 10 825 | (25.83) | 4089 | (36.80) | 6736 | (63.20) | |
| Zero | 24 969 | (61.63) | 8998 | (34.95) | 15 971 | (65.05) | |
*Doctor-diagnosed high blood pressure, diabetes, hyponatraemia, arthritis, allergens, asthma or atopic dermatitis.