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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