Table 3.
Description of sleep groups
| Group | Characteristics | N (%) | Age (SD) | Sex (f/m) | Sleep duration (SD) |
|---|---|---|---|---|---|
| 1. Short sleep and no sleep problems/sleepiness | -Short sleep (≤6 h) -No sleep problems -No daytime sleepiness |
740 (6%) | 55.8 (15.2) | 241/499 | 5.9 (0.4) |
| 2. Short sleep and sleep problems/sleepiness | -Short sleep (≤6 h) -Sleep problems -Daytime sleepiness |
1742 (14%) | 62.7 (13.1) | 848/894 | 5.8 (0.5) |
| 3. Recommended sleep and no sleep problems/sleepiness | -Recommended sleep (7–8 h) -No sleep problems -No daytime sleepiness |
3886 (12%) | 58.1 (14.0) | 1764/2122 | 7.6 (0.5) |
| 4. Recommended sleep and sleep problems/sleepiness | -Recommended sleep (7–8 h) -Sleep problems -Daytime sleepiness |
3243 (10%) | 65.3 (11.3) | 1495/1748 | 7.5 (0.5) |
The percentages refer to the total sample with the same sleep duration, i.e., ≤6 h or 7–8 h.