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Table 1 Characteristics of the study population, 2006–2009

From: Associations between proximity to livestock farms, primary health care visits and self-reported symptoms

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)
  1. GM geometric mean, IQR interquartile range