Exposure | Cumulative exposure | Cases | Controls | OR* (95% CI) |
Organic dust | Never | 6487 | 8940 | 1.00 (reference) |
First quartile | 1549 | 1770 | 1.05 (0.96 to 1.15) | |
Second quartile | 1875 | 1914 | 1.15 (1.06 to 1.25) | |
Third quartile | 1634 | 1804 | 1.12 (1.03 to 1.22) | |
Fourth quartile | 1755 | 1845 | 1.24 (1.14 to 1.35) | |
Test for trend, p value† | <0.001 | |||
Endotoxin | Never | 8509 | 11 305 | 1.00 (reference) |
First quartile | 1241 | 1276 | 1.08 (0.98 to 1.19) | |
Second quartile | 1113 | 1175 | 1.08 (0.98 to 1.20) | |
Third quartile | 1230 | 1268 | 1.12 (1.02 to 1.23) | |
Fourth quartile | 1207 | 1249 | 1.23 (1.12 to 1.36) | |
Test for trend, p value† | <0.001 | |||
Contact with animals | Never | 11 158 | 14 001 | 1.00 (reference) |
First quartile | 661 | 627 | 1.10 (0.97 to 1.26) | |
Second quartile | 463 | 512 | 1.05 (0.90 to 1.21) | |
Third quartile | 488 | 563 | 1.07 (0.93 to 1.24) | |
Fourth quartile | 530 | 570 | 1.15 (1.00 to 1.32) | |
Test for trend, p value† | 0.081 |