| Satisfied | Slightly dissatisfied | Quite dissatisfied | Very dissatisfied | |
|---|---|---|---|---|
| Sleep quality (original four choices), n (%) | 17,994 (35.6) | 22,787 (45.1) | 7,563 (15.0) | 2,203 (4.4) |
| Item | Yes (problem) | No (no problem) |
|---|---|---|
| 1. Sleep induction, n (%) | 20,645 (40.8) | 29,902 (59.2) |
| 2. Awakening during the night, n (%) | 30,234 (59.8) | 20,313 (40.2) |
| 3. Awakening in the early morning, n (%) | 17,538 (34.7) | 33,009 (65.3) |
| 4. Sleep duration, n (%) | 19,601 (38.8) | 30,946 (61.2) |
| 5. Sleep quality (dichotomized), n (%) | 9,766 (19.3) | 40,781 (80.7) |
| 6. Well‐being during the day, n (%) | 15,415 (30.5) | 35,132 (69.5) |
| 7. Functioning during the day, n (%) | 16,209 (32.1) | 34,338 (67.9) |
| 8. Sleepiness during the day, n (%) | 25,152 (49.8) | 25,395 (50.2) |
“Sleep quality” was dichotomized into two categories: “1, satisfied and 2, slightly dissatisfied”; and “3, quite dissatisfied and 4, very dissatisfied or have not slept at all.”