Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.
Characteristics of the subjects
| Group ID | Age range | Number of subjects | Age (mean ± SD) |
|---|---|---|---|
| Young (Y) | 18–40 | 551 (F: 231/M: 320) | 27.42 ± 6.77 |
| 350 (F: 158/M: 192) | 27.31 ± 6.65 | ||
| Middle (M) | 41–60 | 560 (F: 331/M: 229) | 50.94 ± 5.22 |
| 350 (F: 196/M: 154) | 51.07 ± 5.26 | ||
| Old (O) | 61–80 | 372 (F: 198/M: 174) | 68.32 ± 4.58 |
| 350 (F: 188/M: 162) | 68.17 ± 4.03 |
The italic and bold characters indicate the characteristics of 350 subjects randomly selected for each group.
