Characteristics of the study populations and prevalence of insomnia related symptoms
| Reykjavik (n = 1969) | Bergen (n = 2506) | Umeå (n = 2640) | Uppsala (n = 2572) | Göteborg (n = 2188) | Aarhus (n = 2607) | Tartu (n = 1708) | All subjects (n = 16190) | |
|---|---|---|---|---|---|---|---|---|
| Results expressed as % and mean (SD). | ||||||||
| Response rate | 67.8 | 72.6 | 80.2 | 81.8 | 76.0 | 71.0 | 69.4 | 74.2 |
| Age, years | 41 (7) | 41 (7) | 41 (7) | 40 (7) | 40 (7) | 39 (7) | 36 (7) | 40 (7) |
| Women | 54.6 | 51.9 | 51.5 | 52.5 | 54.2 | 52.2 | 56.1 | 53.0 |
| Ex-smokers | 31.5 | 24.5 | 26.2 | 26.1 | 25.6 | 34.6 | 17.1 | 25.1 |
| Current smokers | 30.9 | 38.5 | 19.2 | 19.6 | 29.5 | 34.6 | 35.3 | 29.3 |
| Detached house | 28.6 | 49.4 | 57.5 | 42.7 | 34.8 | 47.9 | 25.9 | 42.5 |
| Semi-detached house | 25.7 | 21.1 | 11.3 | 12.8 | 17.3 | 15.3 | 2.6 | 15.3 |
| Apartment | 45.7 | 29.5 | 31.2 | 44.5 | 47.9 | 36.8 | 71.5 | 42.2 |
| Building dampness (at least one indicator) | 22.7 | 16.4 | 13.9 | 14.6 | 12.1 | 18.8 | 31.6 | 17.9 |
| Water damage | 20.1 | 13.4 | 9.8 | 9.1 | 7.7 | 14.4 | 23.4 | 13.4 |
| Visible moulds | 6.6 | 4.5 | 3.5 | 6.2 | 4.5 | 10.1 | 13.6 | 6.7 |
| Floor dampness | 6.4 | 2.2 | 5.4 | 4.1 | 4.5 | 2.2 | 2.6 | 3.8 |
| Insomnia (at least one symptom) | 25.0 | 22.3 | 26.5 | 24.6 | 32.0 | 21.4 | 22.2 | 24.8 |
| Difficulty inducing sleep | 6.8 | 8.9 | 7.9 | 6.5 | 11.2 | 6.0 | 7.9 | 7.8 |
| Difficulty maintaining sleep | 18.3 | 16.0 | 20.8 | 19.8 | 24.5 | 16.4 | 15.5 | 18.8 |
| Early morning awakenings | 9.5 | 8.2 | 8.6 | 9.1 | 11.2 | 7.4 | 9.2 | 8.9 |