Table 5 Comparison for the characteristics of those participating only once in 2nd wave and others
|  | Maintain in 3rd wave n = 880 (80.3%) | Only participation in 2nd wave n = 216 (19.7%) | P value |
|---|---|---|---|
Age (years) | 68.8 ± 5.7 | 72.2 ± 5.5 | < 0.001 |
Gender | Â | Â | 0.049 |
 Male | 461 (52.4%) | 97 (44.9%) |  |
 Female | 419 (47.6%) | 119 (55.1%) |  |
Smoking status | Â | Â | 0.712 |
 No smoking | 735 (83.6%) | 182 (84.7%) |  |
 Smoking | 144 (16.4%) | 33 (15.3%) |  |
Education | 10.9 ± 2.6 | 10.3 ± 2.7 | 0.005 |
Marital status | |||
 Single | 174 (19.8%) | 48 (22.2%) | .422 |
 Married | 706 (80.2%) | 168 (77.8%) |  |
BMI (kg/m2) | 22.8 ± 2.9 | 23.2 ± 3.6 | 0.110 |
TMIG-IC | 4.9 ± 0.4 | 4.8 ± 0.6 | 0.211 |
Depressive symptoms | Â | 0.001 | |
 Yes | 79 (9.3%) | 36 (17.6%) |  |
 No | 774 (90.7%) | 169 (82.4%) |  |
CCI | |||
 MMSE | 28.1 ± 1.6 | 27.7 ± 1.7 | 0.001 |
 DSST | 43.7 ± 11.1 | 38.7 ± 10.7 | < 0.001 |