Table 1. Demographic characteristics.
| Parameters | No. of subjects (n = 595) |
|---|---|
| Man/woman | 157/438 |
| Age, yr | 74.0 ± 9.0 (range, 51–94) |
| Men | 73.3 ± 9.3 |
| Women | 74.3 ± 8.8 |
| BMI, kg/m2 | 22.9 ± 3.1 (range, 16–36) |
| Men | 23.1 ± 2.9 |
| Women | 22.9 ± 3.1 |
| Education level | |
| Elementary school | 489 (82.2) |
| Middle school | 53 (8.9) |
| High school | 46 (7.7) |
| University | 7 (1.2) |
| Occupations | |
| Farmer | 482 (81.0) |
| Housewife | 44 (7.4) |
| Employee | 7 (1.2) |
| Public officer | 4 (0.7) |
| Business | 12 (2.0) |
| No works | 46 (7.7) |
| Housemates, No. | |
| 1 | 227 (38.2) |
| 2 | 303 (50.9) |
| 3–4 | 61 (10.3) |
| More than 5 | 4 (0.7) |
All values are expressed as mean ± standard deviation or number (%).
BMI = body mass index.