Univariate associations between farm characteristics, environmental measurements, and lung function results for pig farmers (mean (SD))
| n |
FVC % Ref value |
FEV1
% Ref value |
MMEF25/75
% Ref value | |||
| Automatic feeding | No | 8 | 107.6 (14.3) | 103.4 (18.4) | 82.9 (21.2)2-160 | |
| Yes | 22 | 106.8 (14.4) | 110.1 (16.1) | 108.2 (23.1) | ||
| Storage time liquid manure >1 months | No | 25 | 106.3 (14.8) | 107.5 (17.8) | 100.5 (26.3) | |
| Yes | 5 | 110.5 (10.8) | 112.4 (9.4) | 107.8 (17.6) | ||
| Air inlet: porous inlet | No | 17 | 106.5 (15.3) | 107.1 (17.5) | 99.7 (23.6) | |
| Yes | 13 | 107.6 (12.9) | 109.9 (16.1) | 104.3 (27.6) | ||
| Control: humidity sensor | No | 12 | 101.0 (15.7)2-150 | 100.7 (18.9)2-150 | 90.8 (19.6)2-150 | |
| Yes | 18 | 111.0 (11.7) | 113.4 (13.2) | 108.5 (26.0) | ||
| Heating | No | 2 | Number of farmers without heating in the pig house was too low | |||
| Yes | 28 | |||||
| Total dust ⩾median (4.0 mg/m3) | No | 15 | 111.2 (14.9) | 110.4 (15.6) | 100.5 (26.0) | |
| Yes | 16 | 103.3 (12.7) | 106.6 (17.9) | 102.7 (24.8) | ||
| Endotoxin content in total dust ⩾median (58.0 ng/m3) | No | 15 | 104.9 (12.8) | 105.1 (18.2) | 99.4 (30.1) | |
| Yes | 16 | 109.1 (15.5) | 111.6 (15.0) | 104.0 (18.9) | ||
| Total fungi ⩾median (8.72-150106/m3) | No | 14 | 106.6 (14.3) | 105.7 (19.2) | 93.0 (29.2) | |
| Yes | 17 | 107.3 (14.4) | 110.6 (14.4) | 108.8 (18.8) | ||
| Total bacteria ⩾median (4.22-150108/m3) | No | 14 | 105.9 (14.0) | 105.1 (19.0) | 95.2 (29.9) | |
| Yes | 17 | 107.9 (14.6) | 111.2 (14.4) | 107.0 (19.5) | ||
| Ammonia ⩾median (6 ppm) | No | 14 | 108.2 (16.6) | 108.2 (16.8) | 101.2 (25.2) | |
| Yes | 17 | 106.1 (12.3) | 108.4 (17.1) | 102.0 (25.6) | ||
| CO2 ⩾median (1200 ppm) | No | 14 | 109.7 (16.1) | 111.8 (15.9) | 102.6 (17.5) | |
| Yes | 17 | 104.6 (12.1) | 105.3 (17.2) | 100.8 (30.3) | ||
| Temperature ⩾median (19.9°C) | No | 15 | 113.4 (12.3)2-150 | 118.0 (11.7)2-160 | 115.0 (19.8)2-160 | |
| Yes | 16 | 101.4 (13.5) | 99.9 (16.0) | 89.1 (23.1) | ||
| Air humidity ⩾median (75%) | No | 17 | 102.5 (11.9) | 105.3 (11.3) | 103.1 (19.0) | |
| Yes | 14 | 112.1 (15.1) | 111.8 (21.2) | 100.0 (31.5) | ||
| Air velocity ⩾median (0.23 m/s) | No | 15 | 107.8 (15.0) | 108.4 (16.5) | 98.2 (22.2) | |
| Yes | 16 | 106.2 (13.7) | 108.3 (17.5) | 104.9 (27.6) | ||