Table 1.
Survey Weighted Descriptive Statistics of Older Adults Participated in the Activity and Sleep Study of the National Social Life, Health, and Aging Project (NSHAP), 2010–2011
| Mean or Proportion | Standard Deviation | Median | Interquartile Ranges | |
|---|---|---|---|---|
| Insomnia symptoms | ||||
| Feeling rested in the morning (N = 727) | ||||
| Rarely/never | 0.13 | |||
| Sometimes | 0.20 | |||
| Most of the time | 0.67 | |||
| Trouble falling asleep (N = 629) | ||||
| Rarely/never | 0.42 | |||
| Sometimes | 0.46 | |||
| Most of the time | 0.12 | |||
| Trouble waking up during the night (N = 629) | ||||
| Rarely/never | 0.26 | |||
| Sometimes | 0.44 | |||
| Most of the time | 0.30 | |||
| Trouble waking up too early (N = 625) | ||||
| Rarely/never | 0.40 | |||
| Sometimes | 0.47 | |||
| Most of the time | 0.13 | |||
| Insomnia symptom scale (0–8) | 4.04 | 1.43 | 4 | 2 |
| Actigraphic sleep measures | ||||
| Sleep period (h) | 7.90 | 1.34 | 7.89 | 1.55 |
| Total sleep time (h) | 7.25 | 1.27 | 7.31 | 1.53 |
| Percent sleep (0–100) | 82.09 | 14.28 | 86.54 | 20.17 |
| Fragmentation (0–100) | 14.36 | 6.03 | 13.60 | 7.95 |
| WASO (min) | 39.07 | 22.84 | 34.58 | 25.92 |
| Clock time falling asleep (pm h) | 10.44 | 1.56 | 10 | 1 |
| Wake up time (am h) | 6.37 | 1.87 | 6 | 2 |
| Number of wake bouts | 46.15 | 21.50 | 42.67 | 24 |
| Latency (min) | 29.03 | 34.27 | 18.08 | 24.5 |
| Covariates | ||||
| Age | 71.79 | 7.25 | 71 | 12 |
| Female | 0.54 | |||
| Race/ethnicity | ||||
| White | 0.83 | |||
| African-American | 0.07 | |||
| Hispanic | 0.06 | |||
| Others | 0.04 | |||
| Education | ||||
| <High school | 0.14 | |||
| High school | 0.30 | |||
| Some college | 0.34 | |||
| College or more | 0.22 | |||
| Self-rated health | ||||
| Poor | 0.04 | |||
| Fair | 0.16 | |||
| Good | 0.32 | |||
| Very good | 0.34 | |||
| Excellent | 0.14 | |||
| Household income ($10,000) | 5.75 | 7.66 | 4.40 | 4.60 |
| Household assets ($10,000) | 57.60 | 10.94 | 25.00 | 51.00 |