Characteristics | Farmers | Controls | Missing, % | |
---|---|---|---|---|
Sex | Male | Female | Male | |
n (%) | 866 (90.0) | 96 (10.0) | 172 (100) | |
Baseline characteristics | ||||
Age years (median (minimum–maximum)) | 18.5 (16.8–24.8) | 19.0 (17.3–24.2) | 19.0 (18.5–23.1) | 0.0 |
Height, cm (mean±SD) | 180.4±6.98 | 167.4±7.08 | 180.9±6.86 | 0.0 |
Atopy | 13.7 | 11.5 | 25.0 | 0.5 |
Asthma | 3.2 | 6.3 | 5.2 | 0.2 |
BHR | 9.1 | 7.3 | 6.4 | 2.2 |
Follow-up characteristics | ||||
Follow-up time years (median (minimum–maximum)) | 15.1 (13.8–16.8) | 15.2 (13.8–16.7) | 14.8 (14.3–15.7) | 0.0 |
Height, cm (mean±SD) | 181.4±6.92 | 168.1±7.04 | 181.8±6.74 | 0.0 |
BMI, kg/m2 (median (minimum–maximum)) | 27.2 (18.4–48.9) | 26.9 (19.8–50.7) | 26.6 (18.3–37.1) | 0.0 |
Smoking history | 1.8 | |||
Never-smoker | 63.7 | 65.2 | 63.7 | |
Ex-smoker (quit >2 years ago) | 6.6 | 12.0 | 11.3 | |
Current smoker low (0–10 pack-years) | 11.3 | 15.2 | 13.1 | |
Current smoker high (10–59 pack-years) | 18.4 | 7.6 | 11.9 | |
Raised on a farm | 58.7 | 30.2 | 16.9 | 0.1 |
Farm work years (median (minimum–maximum)) | 13.0 (0–25.0) | 7.0 (0–20.0) | 0 (0–15.0) | 1.9 |
Farming status | 1.8 | |||
Never | 0.0 | 0.0 | 95.3 | |
Ex | 52.6 | 60.0 | 4.1 | |
Current | 47.4 | 40.0 | 0.6 | |
Farm type | 1.9 | |||
Only worked with cattle | 21.1 | 14.9 | − | |
Worked with mixed animals | 54.6 | 59.6 | − | |
Only worked with pigs | 24.3 | 25.5 | − | |
Dust, mg/m3 years | 2.6 | |||
1st quartile: 0 to <3.8 | 24.5 | 30.1 | − | |
2nd quartile: 3.8 to <8.2 | 24.0 | 33.3 | − | |
3rd quartile: 8.2 to <16.1 | 26.0 | 16.1 | − | |
4th quartile: 16.1 to 71.0 | 25.5 | 20.5 | − | |
Endotoxin EU/m3 years | 2.6 | |||
1st quartile: 0 to <900 | 25.4 | 22.6 | − | |
2nd quartile: 900 to <2400 | 24.6 | 28.0 | − | |
3rd quartile: 2400 to <6000 | 25.1 | 23.6 | − | |
4th quartile: 6000 to 32 000 | 24.9 | 25.8 | − | |
Total per cent missing | 6.7 |
Expressed as per cent unless otherwise specified.
BHR, bronchial hyper responsiveness; BMI, body mass index.