Table 1.
General characteristics of the study subjects.
| Variables | Total (n = 4632) |
|---|---|
| Age (years, mean ± SE) | 72.5 ± 0.1 |
| Age range | |
| 65–69 | 1538 (33.6) |
| 70–79 | 2411 (51.9) |
| ≥80 | 683 (14.5) |
| Gender | |
| Male | 2184 (48.8) |
| Female | 2448 (51.2) |
| Living status | |
| Living alone | 990 (17.5) |
| Living with others | 3642 (82.5) |
| Residence | |
| Rural | 1300 (21.6) |
| Urban | 3332 (78.4) |
| Education | |
| ≤Elementary school | 2708 (56.2 |
| ≥Middle school | 1924 (43.8) |
| Family income | |
| ≤The lowest quartile | 2164 (44.9) |
| ≥Middle–low | 2468 (55.1) |
| Current smoking status | |
| Current smoker | 439 (9.6) |
| Non-current smoker | 4193 (90.4) |
| High-risk alcohol consumption | |
| Yes | 187 (4.1) |
| No | 4444 (95.9) |
| Body mass index (kg/m2, mean ± SE) | 24.0 ± 0.1 |
| Body mass index range | |
| <18.5 | 120 (2.6) |
| 18.5–24.9 | 2833 (61.7) |
| ≥25.0 | 1679 (35.7) |
| Comorbidity | |
| Yes | 925 (19.7) |
| No | 3707 (80.3) |
Values are presented as mean ± standard error (SE) or n (%).