Table 2 Item response rates for the Minimal Insomnia Symptom Scale (items 1–3) and the new item “daytime disturbance” (item 4)
From: Measurement properties of the minimal insomnia symptom scale (MISS) in adolescents
Response category endorsement n (%) | |||||
|---|---|---|---|---|---|
No | Minor | Moderate | Severe | Very severe | |
Total sample (n = 2955) | |||||
Problems with… (item#) | |||||
…difficulties falling asleep (1) | 802 (27.1) | 1286 (43.5) | 615 (20.8) | 187 (6.3) | 65 (2.2) |
…night awakening (2) | 1594 (53.9) | 940 (31.8) | 290 (9.8) | 88 (3.0) | 43 (1.5) |
…not being rested by sleep (3) | 714 (24.2) | 984 (33.3) | 765 (25.9) | 363 (12.3) | 129 (4.4) |
…daytime disturbance (4) | 726 (24.6) | 1106 (37.4) | 728 (24.6) | 281 (9.5) | 114 (3.9) |
Younger (n = 1491) a | |||||
Problems with… (item#) | |||||
…difficulties falling asleep (1) | 487 (32.7) | 676 (45.3) | 243 (16.3) | 59 (4.0) | 26 (1.8) |
…night awakening (2) | 889 (59.6) | 461 (30.9) | 94 (6.3) | 33 (2.2) | 14 (0.9) |
…not being rested by sleep (3) | 546 (36.6) | 530 (35.5) | 254 (17.0) | 120 (8.0) | 41 (2.7) |
… daytime disturbance (4) | 558 (36.8) | 592 (39.7) | 229 (15.4) | 84 (5.6) | 38 (2.5) |
Older (n = 1464) b | |||||
Problems with… (item#) | |||||
…difficulties falling asleep (1) | 315 (21.5) | 610 (41.7) | 372 (25.4) | 128 (8.7) | 39 (2.7) |
…night awakening (2) | 705 (48.2) | 479 (32.7) | 196 (13.4) | 55 (3.8) | 29 (2.0) |
…not being rested by sleep (3) | 168 (11.5) | 454 (31.0) | 511 (34.9) | 243 (16.6) | 88 (6.0) |
… daytime disturbance (4) | 178 (12.2) | 514 (35.1) | 499 (34.1) | 197 (13.5) | 76 (5.2) |
Females (n = 1560) | |||||
Problems with… (item#) | |||||
…difficulties falling asleep (1) | 391 (25.1) | 706 (45.3) | 330 (21.2) | 101 (6.5) | 32 (2.1) |
…night awakening (2) | 805 (51.6) | 522 (33.5) | 167 (10.7) | 42 (2.7) | 24 (1.5) |
…not being rested by sleep (3) | 301 (19.3) | 544 (34.9) | 461 (29.6) | 190 (12.2) | 64 (4.1) |
… daytime disturbance (4) | 331 (21.2) | 609 (39.0) | 411 (26.3) | 146 (9.3) | 63 (4.0) |
Males (n = 1357) | |||||
Problems with… (item#) | |||||
…difficulties falling asleep (1) | 399 (29.4) | 570 (42.0) | 272 (20.0) | 84 (6.2) | 32 (2.4) |
…night awakening (2) | 764 (56.3) | 409 (30.1) | 120 (8.8) | 46 (3.4) | 18 (1.3) |
…not being rested by sleep (3) | 403 (29.7) | 431 (31.8) | 293 (21.6) | 166 (12.2) | 64 (4.7) |
… daytime disturbance (4) | 388 (28.6) | 480 (35.4) | 310 (22.8) | 130 (9.6) | 49 (3.6) |