Table 2:
Association between sleep parameters and sleep disturbance scores*
| Variable | No. (%) | p value | |||
|---|---|---|---|---|---|
| All groups | Tertile 1 (sleep disturbance score 0–3) | Tertile 2 (sleep disturbance score 4–8) | Tertile 3 (sleep disturbance score ≥ 9) | ||
| Overall sleep quality, weeknights, n = 3321 | < 0.001 | ||||
| Very good | 786 (23.7) | 455 (39.6) | 241 (20.6) | 90 (9.0) | |
| Fairly good | 1882 (56.7) | 603 (52.4) | 731 (62.5) | 548 (54.7) | |
| Fairly bad | 549 (16.5) | 79 (6.9) | 176 (15.1) | 294 (29.3) | |
| Very bad | 104 (3.1) | 13 (1.1) | 21 (1.8) | 70 (7.0) | |
| Overall sleep quality, weekend nights, n = 3273 | < 0.001 | ||||
| Very good | 1602 (49.0) | 700 (61.6) | 547 (47.6) | 355 (36.0) | |
| Fairly good | 1341 (41.0) | 377 (33.2) | 501 (43.6) | 463 (46.9) | |
| Fairly bad | 260 (7.9) | 48 (4.2) | 90 (7.8) | 122 (12.4) | |
| Very bad | 70 (2.1) | 11 (1.0) | 12 (1.0) | 47 (4.8) | |
| Use of sleep medication, n = 3161 | |||||
| Not during the past month | 2979 (94.2) | 1063 (96.9) | 1050 (95.5) | 866 (89.7) | < 0.001 |
| Less than once a week | 81 (2.6) | 18 (1.6) | 22 (2.0) | 41 (4.3) | |
| Once or twice a week | 30 (1.0) | 7 (0.6) | 9 (0.8) | 14 (1.5) | |
| Three or more times a week | 71 (2.3) | 9 (0.8) | 18 (1.6) | 44 (4.6) | |
| Enough energy, weekday, n = 3305 | < 0.001 | ||||
| No problem at all | 1813 (54.9) | 822 (71.8) | 636 (55.4) | 355 (35.1) | |
| Slight problem | 841 (25.5) | 215 (18.8) | 323 (28.1) | 303 (30.0) | |
| Noticeable problem | 472 (14.3) | 79 (6.9) | 138 (12.0) | 255 (25.2) | |
| Very big problem | 179 (5.4) | 29 (2.5) | 52 (4.5) | 98 (9.7) | |
| Enough energy, weekend, n = 3283 | < 0.001 | ||||
| No problem at all | 1820 (55.4) | 865 (75.9) | 611 (53.3) | 344 (34.5) | |
| Slight problem | 1197 (36.5) | 248 (21.8) | 469 (40.9) | 480 (48.1) | |
| Noticeable problem | 229 (7.0) | 23 (2.0) | 59 (5.2) | 147 (14.7) | |
| Very big problem | 37 (1.1) | 3 (0.3) | 7 (0.6) | 27 (2.7) | |
| Daytime sleepiness, n = 3206 | < 0.001 | ||||
| Not during the past month | 2359 (73.6) | 980 (88.0) | 833 (73.9) | 546 (56.6) | |
| Less than once a week | 715 (22.3) | 124 (11.1) | 267 (23.7) | 324 (33.6) | |
| Once or twice a week | 109 (3.4) | 9 (0.8) | 26 (2.3) | 74 (7.7) | |
| Three or more times a week | 23 (0.7) | 1 (0.1) | 2 (0.2) | 20 (2.1) | |
*
Sleep disturbance scores ranged from 0 to 45, with higher scores indicating greater sleep disturbance.