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 sample.
| Demographics | Sham | Active |
|---|---|---|
| Age, y | 55 ± 7.51 | 49 ± 11.06 |
| Sex | ||
| Female | 80% | 90% |
| Male | 20% | 10% |
| Race/ethnicity | ||
| White | 90% | 85% |
| Hispanic/Latino | 0% | 10% |
| Black (African) | 10% | 0% |
| Asian | 0% | 5% |
| Financial status | ||
| Lower middle | 20% | 25% |
| Middle | 40% | 35% |
| Upper middle | 40% | 40% |
| Sleep satisfaction | ||
| 0–19% | 10% | 10% |
| 20–39% | 50% | 5% |
| 40–59% | 30% | 35% |
| 60–79% | 10% | 40% |
| 80–100% | 0% | 10% |
Age is reported as mean ± standard deviation.
