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Characteristics of the subjects in this study.
| Group ID | Age (mean ± SD) | Number of subjects |
|---|---|---|
| Young (Y) | 18–23 (20.66 ± 1.47) | 80 (F:50/M:30) |
| Middle-aged (M) | 30–58 (47.43 ± 8.23) | 80 (F:50/M:30) |
| Old (O) | 61–89 (73.75 ± 7.12) | 80 (F:55/M:25) |
female
male.
