Table 2.
Characteristic of the participants at baseline in two survey periods
| 3-year period (2008–2011) | 6-year period(2008–2014) | |
|---|---|---|
| (N = 8425) | (N = 5245) | |
| Age, mean (SD) | 82.6 (11.0) | 79.1 (10.1) |
| Gender:female,n(%) | 4607 (54.7) | 2800 (53.4) |
| Education year, mean (SD) | 2.4 (3.6) | 2.6 (3.6) |
| Residenc:Rural, n(%) | 5207 (61.8) | 3319 (63.3) |
| Living arrangement: independently, n(%) | 1368 (16.2) | 843 (16.1) |
| Relative economic status, n(%) | ||
| rich | 1467 (17.4) | 873 (16.7) |
| so so | 5778 (68.7) | 3622 (69.2) |
| poor | 1162 (13.8) | 740 (14.1) |
| Current somker, n(%) | 1710 (20.3) | 1178 (22.5) |
| Current drinker, n(%) | 1670 (19.8) | 1114 (21.2) |
| Loneliness, n(%) | ||
| never | 3262 (41.9) | 2208 (43.8) |
| seldom | 2330 (29.9) | 1532 (30.4) |
| often | 2195 (28.2) | 1301 (25.8) |
| No. of components of frail scale at baseline, mean (SD) | 1.20 (1.2) | 0.98 (1.1) |
| Frailty index score at baseline, mean (SD) | 0.13 (0.1) | 0.11 (0.1) |