Table 1.
Characteristics of participants.
| Mean ± SD | Min | Max | |
|---|---|---|---|
| Age, years | 73.9 ± 5.0 | 65 | 86 |
| Female, n (%) | 73 (79.3) | ||
| Body mass index, kg/m2 | 23.7 ± 3.2 | 16.9 | 38.3 |
| Smoking history, n (%) | 1 (1.1) | ||
| Alcohol consumption (drinker), n (%) | 35 (38.0) | ||
| Caffeine consumption (drinker), n (%) | 84 (91.3) | ||
| Medical history | |||
| Hypertension, n (%) | 35 (38.0) | ||
| Hyperlipidemia, n (%) | 18 (19.6) | ||
| Diabetes, n (%) | 4 (4.3) | ||
| GDS score, points | 3.2 ± 2.8 | 0 | 14 |
| Objective sleep parameters | |||
| Time in bed, min | 459 ± 62.3 | 243.6 | 612.1 |
| Total sleep time, min | 373.6 ± 44.6 | 208.9 | 452.9 |
| Sleep latency, min | 19.7 ± 11.0 | 4.3 | 60.6 |
| WASO, min | 68.1 ± 30.3 | 21.2 | 149.8 |
| Sleep efficiency, % | 81.4 ± 6.2 | 64.8 | 91.7 |
| REM latency, min | 96.7 ± 34.3 | 48.4 | 240.8 |
| N1, % | 10.5 ± 4.2 | 2.6 | 25.3 |
| N2, % | 58.3 ± 7.0 | 43.0 | 75.6 |
| N3, % | 7.9 ± 7.3 | 0 | 27.8 |
| REM, % | 23.3 ± 4.1 | 13.3 | 33.1 |
| Sum of delta power, μV2/night | 115,306 ± 9223 | 25,768 | 272,428 |
| Subjective sleep parameters | |||
| Sleepiness on rising, pts | 51.8 ± 7.5 | 30.1 | 65.0 |
| Initiation and maintenance of sleep, pts | 46.8 ± 7.4 | 19.4 | 62.5 |
| Frequent dreaming, pts | 52.5 ± 6.2 | 38.8 | 58.4 |
| Refreshing, pts | 53.2 ± 7.0 | 37.4 | 65.6 |
| Sleep length, pts | 48.3 ± 6.7 | 28.8 | 63.5 |
| OSA-MA total score, pts | 252.6 ± 25.4 | 197.4 | 303.8 |
| Habitual physical activity | |||
| Wear time, hour | 15.2 ± 1.4 | 11.8 | 18.3 |
| SB, hour (% of wear time) | 8.9 (58.2) | 5.0 | 12.7 |
| LPA, hour (% of wear time) | 5.3 (34.7) | 2.1 | 7.4 |
| MVPA, hour (% of wear time) | 1.1 (7.1) | 0.1 | 3.5 |
SD standard deviation, GDS Geriatric Depression Scale (Sheikh JI and Yesavage, 1986), WASO wake after sleep onset, N non-REM sleep stage, REM rapid eye movement, SB sedentary behavior, LPA low-intensity physical activity, MVPA moderate-vigorous-intensity physical activity. n = 92.