Table 3.
Item‐level descriptive statistics
| Items | High‐school sample (n = 1,013) | Sleep‐clinic sample (n = 33) | ||||
|---|---|---|---|---|---|---|
| Median | Mean (SD) | Missing (%) | Median | Mean (SD) | Missing (%) | |
| Sleep Disturbance‐23 | ||||||
| Sleep105: My sleep was restful. | 2 | 2.4 (1.0) | 0 (0.0) | 4 | 3.8 (1.0) | 0 (0.0) |
| Sleep107: My sleep was deep. | 2 | 2.5 (1.1) | 2 (0.2) | 4 | 3.4 (1.4) | 0 (0.0) |
| Sleep109: My sleep quality was … | 2 | 2.2 (0.8) | 2 (0.2) | 4 | 3.6 (0.8) | 0 (0.0) |
| Sleep110: I got enough sleep. | 2 | 2.5 (0.9) | 2 (0.2) | 3 | 3.5 (0.9) | 0 (0.0) |
| Sleep115: I was satisfied with my sleep. | 2 | 2.6 (1.1) | 2 (0.2) | 4 | 3.9 (1.1) | 0 (0.0) |
| Sleep116: My sleep gave me new energy. | 2 | 2.5 (1.1) | 47 (4.7) | 4 | 3.8 (1.0) | 1 (3.0) |
| Sleep42: It was easy for me to fall asleep. | 2 | 2.6 (1.1) | 9 (0.9) | 4 | 3.8 (1.4) | 0 (0.0) |
| Sleep44: I had difficulty falling asleep. | 2 | 2.2 (1.2) | 12 (1.2) | 4 | 3.7 (1.5) | 0 (0.0) |
| Sleep45: I laid in bed for hours waiting to fall asleep. | 2 | 2.1 (1.1) | 10 (1.0) | 4 | 3.4 (1.5) | 1 (3.0) |
| Sleep50: I woke up too early and could not fall back asleep. | 2 | 2.1 (1.1) | 9 (0.9) | 3 | 2.6 (1.3) | 0 (0.0) |
| Sleep65: I felt physically tense at bedtime. | 1 | 1.7 (1.0) | 9 (0.9) | 2 | 2.1 (1.4) | 1 (3.0) |
| Sleep67: I worried about not being able to fall asleep. | 1 | 1.5 (0.9) | 8 (0.8) | 2 | 2.2 (1.4) | 0 (0.0) |
| Sleep68: I felt worried at bedtime. | 1 | 1.4 (0.8) | 9 (0.9) | 1 | 1.9 (1.3) | 0 (0.0) |
| Sleep69: I had trouble stopping my thoughts at bedtime. | 1 | 2.0 (1.2) | 8 (0.8) | 2 | 2.5 (1.5) | 3 (9.1) |
| Sleep70: I felt sad at bedtime. | 1 | 1.3 (0.8) | 9 (0.9) | 1 | 1.7 (1.2) | 0 (0.0) |
| Sleep71: I had trouble getting into a comfortable position to sleep. | 1 | 1.8 (1.0) | 9 (0.9) | 2 | 2.3 (1.3) | 0 (0.0) |
| Sleep72: I tried to get to sleep. | 2 | 2.1 (1.2) | 23 (2.3) | 3 | 3.1 (1.4) | 0 (0.0) |
| Sleep78: Stress disturbed my sleep. | 1 | 1.7 (1.1) | 22 (2.2) | 2 | 2.2 (1.3) | 0 (0.0) |
| Sleep86: I tossed and turned at night. | 1 | 1.9 (1.2) | 22 (2.2) | 3 | 2.8 (1.4) | 3 (9.1) |
| Sleep87: I had trouble staying asleep at night. | 1 | 1.6 (0.9) | 47 (4.7) | 3 | 3.0 (1.3) | 0 (0.0) |
| Sleep90: I had trouble sleeping. | 2 | 1.8 (1.0) | 22 (2.2) | 4 | 3.3 (1.3) | 1 (3.0) |
| Sleep92: I woke up and had trouble falling back to sleep. | 2 | 2.1 (1.2) | 22 (2.2) | 3 | 3.1 (1.5) | 1 (3.0) |
| Sleep93: I was afraid I would not get back to sleep after waking up. | 1 | 1.5 (0.9) | 22 (2.2) | 2 | 2.2 (1.4) | 2 (6.1) |
| Sleep‐related Impairment‐11 | ||||||
| Sleep6: I was sleepy during the daytime. | 2 | 2.4 (1.1) | 22 (2.2) | 4 | 3.3 (1.2) | 0 (0.0) |
| Sleep7: I had trouble staying awake during the day. | 1 | 1.7 (1.0) | 21 (2.1) | 2 | 2.5 (1.3) | 0 (0.0) |
| Sleep10: I had a hard time getting things done because I was sleepy. | 1 | 1.7 (0.9) | 36 (3.6) | 2 | 2.5 (1.4) | 0 (0.0) |
| Sleep11: I had a hard time concentrating because I was sleepy. | 2 | 1.9 (1.0) | 36 (3.6) | 3 | 2.9 (1.5) | 0 (0.0) |
| Sleep18: I felt tired. | 2 | 2.3 (1.1) | 37 (3.7) | 4 | 3.7 (1.4) | 2 (6.1) |
| Sleep19: I tried to sleep whenever I could. | 1 | 1.8 (1.0) | 39 (3.9) | 2 | 2.4 (1.2) | 2 (6.1) |
| Sleep25: I had problems during the day because of poor sleep. | 1 | 1.6 (0.8) | 37 (3.7) | 2 | 2.7 (1.5) | 2 (6.1) |
| Sleep27: I had a hard time concentrating because of poor sleep. | 1 | 1.8 (1.0) | 38 (3.8) | 3 | 2.9 (1.5) | 2 (6.1) |
| Sleep29: My daytime activities were disturbed by poor sleep. | 1 | 1.7 (0.9) | 37 (3.7) | 3 | 2.7 (1.2) | 0 (0.0) |
| Sleep30: I felt irritable because of poor sleep. | 2 | 1.8 (1.0) | 38 (3.8) | 3 | 3.0 (1.3) | 0 (0.0) |
| Sleep33: I had a hard time controlling my emotions because of poor sleep. | 1 | 1.6 (0.9) | 36 (3.6) | 3 | 2.7 (1.4) | 1 (3.0) |