Table 1.
Baseline Characteristics of the Study Subjects
| Characteristic | Study subjects | Adjusted subjects* | Whole adult South Korean |
|---|---|---|---|
| No. | 1,003 | 1,003 | 43,044,713 |
| Male sex | 497 (49.7) | 497 (49.6) | 21,334,875 (49.6) |
| Age, yr | 49.6±17.4 | 47.9±17.0 | |
| 19–29 | 174 (17.4) | 174 (17.4) | 7,438,522 (17.3) |
| 30–39 | 168 (16.8) | 168 (16.8) | 7,247,690 (16.8) |
| 40–49 | 196 (19.6) | 196 (19.6) | 8,484,276 (19.7) |
| 50–59 | 203 (20.2) | 202 (20.2) | 8,629,296 (20.0) |
| 60–69 | 139 (13.9) | 139 (13.9) | 5,978,518 (13.9) |
| 70–79 | 89 (8.8) | 89 (8.8) | 3,505,803 (8.1) |
| ≥80 | 34 (3.4) | 34 (3.4) | 1,760,608 (4.1) |
| Residence area | |||
| Seoul | 200 (19.9) | 194 (19.4) | 8,335,109 (19.4) |
| Incheon/Gyeonggi | 303 (30.2) | 306 (30.5) | 13,111,906 (30.5) |
| Gangwon | 30 (3.0) | 30 (3.0) | 1,299,071 (3.0) |
| Daejeon/Chungcheong | 105 (10.5) | 106 (10.5) | 4,534,192 (10.5) |
| Daegu/Gyeongbuk | 100 (10.0) | 100 (10.0) | 4,302,165 (10.0) |
| Busan/Ulsan/Gyeongnam | 152 (15.2) | 155 (15.4) | 6,644,809 (15.4) |
| Gwangju/Jeolla | 100 (10.0) | 100 (9.9) | 4,278,825 (9.9) |
| Jeju | 13 (1.3) | 13 (1.3) | 538,636 (1.3) |
| Education level | |||
| ≤Elementary school | 88 (8.7) | 88 (8.7) | - |
| Middle school | 68 (6.8) | 68 (6.8) | - |
| High school | 272 (27.2) | 272 (27.2) | - |
| University | 495 (49.4) | 495 (49.4) | - |
| Graduate school | 46 (4.6) | 46 (4.6) | - |
| Refuse to respond | 34 (3.4) | 34 (3.4) | - |
| Average monthly income, USD* | |||
| <1,275 | 147 (14.7) | 147 (14.7) | - |
| 1,275–2,550 | 162 (16.1) | 162 (16.1) | - |
| 2,550–3,400 | 147 (14.7) | 147 (14.7) | - |
| 3,400–4,675 | 154 (15.4) | 154 (15.4) | - |
| 4,675–7,225 | 119 (11.8) | 119 (11.8) | - |
| ≥7,225 | 73 (7.2) | 73 (7.2) | - |
| Refuse to respond | 201 (20.0) | 201 (20.0) | - |
Data are presented as number (%) or mean±SD. Weighted by sex, age, and area based on the resident population registered with the Ministry of the Interior and Safety at the end of January 2019.13
USD, United States dollar.
*Based on South Korea Won to the USD exchange rate on July 12, 2019.