Table 1.
Characteristics of the study population, 2006–2009
| Characteristic | |
|---|---|
| Person years, n (%) | 144,984 |
| Female gender, n (%) | 71,391 (49.2) |
| Age, years (mean (SD)) | 39.7 (22.2) |
| Chronic diseases, nr (mean (SD)) | 0.31 (0.64) |
| Distance to general practice, m (GM (IQR)) | 970 (470–2330) |
| Contacts, nr (mean (SD)) | 3.77 (4.83) |
| Contacts for respiratory symptoms, nr (mean (SD)) | 0.15 (0.61) |
| Contacts for respiratory diagnoses, nr (mean (SD)) | 0.32 (1.07) |
| Contacts for acute respiratory infections, nr (mean (SD)) | 0.14 (0.60) |
| Distance weighted PM10 emission from farms within 500 m, g∙y-1∙m-2 (GM (IQR)) | 0.0437 (0.0001–3.0000) |
| Distance to the nearest livestock farm, m (GM (IQR)) | 351 (250–570) |
| One or more farms within 500 m, n (%) | 95,074 (65.6) |
| Livestock farms within 500 m, nr (mean (SD)) | 1.94 (2.23) |
| Presence of farm animals within 500 m, n (%) | |
| Cattle | |
| 1–69 | 22,707 (15.7) |
| 70–299 | 26,902 (18.6) |
| 300–4,210 | 26,786 (18.5) |
| Swine | |
| 1–649 | 18,891 (13.0) |
| 650–1,999 | 17,737 (12.2) |
| 2,000–32,660 | 20,157 (13.9) |
| Poultry | |
| 1–13,999 | 10,848 (7.5) |
| 14,000–401,250 | 10,731 (7.4) |
| Sheep | |
| 1–49 | 10,529 (7.3) |
| 50–1,400 | 8,324 (5.7) |
| Mink | 5,834 (4.0) |
| Goat | 4,291 (3.0) |
GM geometric mean, IQR interquartile range