Table 2 Central tendency and variability of the ISI scale
From: The Moroccan dialect version of the Insomnia Severity Index
ESS items | Mean (SD) | Median (min-max) | Floor effecta (%) | Ceiling effectb (%) |
|---|---|---|---|---|
Item 1 | 1.33 (1.02) | 1 (0–4) | 22.5 | 1.7 |
Item 2 | 0.92 (0.91) | 1 (0–4) | 39.2 | 0.8 |
Item 3 | 2.06 (1.34) | 2 (0–4) | 15.8 | 18.3 |
Item 4 | 1.93 (1.01) | 2 (0–4) | 5.0 | 6.7 |
Item 5 | 1.01 (0.96) | 1 (0–4) | 35.8 | 1.7 |
Item 6 | 1.33 (1.05) | 1 (0–4) | 25.0 | 1.7 |
Item 7 | 1.64 (0.99) | 2 (0–4) | 10.0 | 4.2 |
Total score | 10.15 (5.02) | 10.5 (0–28) | 2.5 | 0.8 |