The association between the number of insomnia symptoms and incident asthma in the Nord-Trøndelag Health Study (HUNT) (1995–2008)
| Subjects | Asthma cases | Model 1# | p-value | Model 2¶ | p-value | Model 3+ | p-value | |
| Insomnia symptoms n | ||||||||
| 0 | 7329 | 234 | Ref. | Ref. | Ref. | |||
| 1 | 4941 | 191 | 1.23 (1.01–1.50) | 0.04 | 1.18 (0.97–1.44) | 0.09 | 1.14 (0.93–1.39) | 0.20 |
| 2 | 2460 | 112 | 1.44 (1.14–1.81) | <0.01 | 1.30 (1.03–1.64) | 0.03 | 1.21 (0.95–1.53) | 0.11 |
| 3 | 2511 | 149 | 1.90 (1.53–2.35) | <0.01 | 1.70 (1.37–2.11) | <0.01 | 1.49 (1.17–1.87) | <0.01 |
| Continuous | 17 927 | 686 | 1.23 (1.15–1.32) | <0.01 | 1.18 (1.10–1.27) | <0.01 | 1.13 (1.05–1.22) | <0.01 |
Data are presented as n or OR (95% CI), unless otherwise stated. Ref: reference. #: adjusted for age and sex; ¶: adjusted for age, sex, body mass index, education, economic difficulty and smoking status; +: adjusted for age, sex, body mass index, education, economic difficulty, smoking status, anxiety and depression.