Table 1. Characteristics of Study Participants.
| Characteristic | No. (%) | |
|---|---|---|
| Comparison group (n = 1172) | Patient group (n = 586) | |
| Sex | ||
| Male | 446 (38.1) | 226 (38.6) |
| Female | 726 (61.9) | 360 (61.4) |
| Age, y | ||
| <45 | 477 (40.7) | 224 (38.2) |
| 45-64 | 435 (37.1) | 232 (39.6) |
| >64 | 260 (22.2) | 130 (22.2) |
| Location of residence | ||
| Seoul | 235 (20.1) | 112 (19.1) |
| Other large city | 245 (20.9) | 122 (20.8) |
| Small city or rural area | 692 (59.0) | 352 (60.1) |
| Household income (% of group median) | ||
| Low (≤30.0) | 255 (21.8) | 132 (22.5) |
| Middle (30.1–69.9) | 376 (32.1) | 184 (31.4) |
| High (≥70.0) | 541 (46.2) | 270 (46.1) |
| Hypertension | ||
| No | 582 (49.7) | 300 (51.2) |
| Yes | 590 (50.3) | 286 (48.8) |
| Diabetes type 2 | ||
| No | 788 (67.2) | 378 (64.5) |
| Yes | 384 (32.8) | 208 (35.5) |
| Chronic renal failure | ||
| No | 1157 (98.7) | 576 (98.3) |
| Yes | 15 (1.3) | 10 (1.7) |