The association between the Insomnia Severity Index and degree of asthma control
| Variables | Level of asthma control | P value | ||
| Well controlled n=115 | Partially controlled n=135 | Uncontrolled n=146 | ||
| Total ISI score, mean (±SD) | 7.2 (5.3) | 15.3 (4.8) | 20.5 (5.9) | <0.001 |
| Insomnia status | <0.001 | |||
| No insomnia, ISI<10 | 92 (81.4) | 13 (13.5) | 8 (7.1) | |
| Insomnia, ISI≥10 | 23 (8.1) | 122 (43.1) | 138 (48.8) | |
| Insomnia severity | ||||
| No insomnia (ISI=0–7) | 80 (84.2) | 6 (6.3) | 9 (9.5) | <0.001 |
| Subthreshold insomnia (ISI=8–14) | 21 (21.9) | 53 (55.2) | 22 (22.9) | |
| Moderate insomnia (ISI=15–21) | 11 (10) | 63 (57.3) | 36 (32.7) | |
| Severe insomnia (ISI=22–28) | 3 (3.2) | 10 (10.5) | 82 (86.3) | |
ISI, Insomnia Severity Index.