Table 1.
General characteristics of subjects (n = 24,475).
| Characteristic | n | % |
|---|---|---|
| Age | ||
| ≤25 | 13,909 | 56.8 |
| >25 and ≤35 | 5284 | 21.6 |
| >35 and ≤45 | 3900 | 15.9 |
| >45 | 1382 | 5.6 |
| Gender | ||
| Man | 11,891 | 48.6 |
| Woman | 12,584 | 51.4 |
| Body mass index (BMI) | ||
| Non-overweight | 15,454 | 63.1 |
| Overweight | 9021 | 36.9 |
| Marital status | ||
| Unmarried | 14,510 | 59.3 |
| Married or others | 9965 | 40.7 |
| Education level | ||
| Less than junior high school | 2460 | 10.1 |
| High school or college | 9135 | 37.3 |
| Bachelor degree or above | 12,880 | 52.6 |
| Professional | ||
| Professional | 5384 | 22.0 |
| Manager | 3649 | 14.9 |
| Clerk | 239 | 1.0 |
| Soldier | 88 | 0.4 |
| High school student | 10,087 | 41.2 |
| Production personnel | 128 | 0.5 |
| Operating personnel | 2802 | 11.4 |
| Business, service personnel | 483 | 2.0 |
| Freelancer | 860 | 3.5 |
| No occupation (housewife, etc.) | 51 | 0.2 |
| Others | 704 | 2.9 |
| Smoking status | ||
| Never | 20,804 | 85.0 |
| Yes | 3395 | 13.9 |
| Previously | 276 | 1.1 |
| Drinking behavior | ||
| Never | 7189 | 29.4 |
| Little | 11,207 | 45.8 |
| Sometimes | 5476 | 22.4 |
| Often | 565 | 2.3 |
| Always | 38 | 0.2 |