Associations between asthma in atopic (n = 264) and non-atopic (n = 1350) individuals and annual average exposure levels in a farming population
| Factor | ORadj of risk factor* | |
|---|---|---|
| Asthma in atopic farmers† (n = 33) | Asthma in non-atopic farmers (n = 131) | |
| Results of models with two exposure variables are shown. The ORs of potential confounders were similar to table 2 (not shown). | ||
| *Adjusted by logistic regression. | ||
| †Only significant potential confounders were included in this model. | ||
| Fungal spores (106/m3) | ||
| 0–1.6 | 1 | 1 |
| 1.7–3.4 | 0.51 (0.09 to 3.0) | 2.3 (1.1 to 4.6) |
| 3.5–38 | 0.31 (0.06 to 1.7) | 1.7 (0.81 to 3.6) |
| Endotoxins (103 EU/m3) | ||
| 0–26 | 1 | 1 |
| 27–60 | 1.1 (0.18 to 6.6) | 0.59 (0.28 to 1.3) |
| 61–140 | 0.81 (0.15 to 4.2) | 1.1 (0.52 to 2.2) |
| Fungal spores (106/m3) | ||
| 0–1.6 | 1 | 1 |
| 1.7–3.4 | 0.31 (0.07 to 1.4) | 1.3 (0.64 to 2.8) |
| 3.5–38 | 0.23 (0.05 to 1.2) | 1.3 (0.62 to 2.6) |
| Ammonia (ppm) | ||
| 0–4.2 | 1 | 1 |
| 4.3–10 | 2.2 (0.54 to 9.3) | 1.1 (0.56 to 2.3) |
| 11–23 | 1.1 (0.18 to 6.2) | 1.5 (0.69 to 3.1) |
| Endotoxins (103 EU/m3) | ||
| 0–26 | 1 | 1 |
| 27–60 | 0.56 (0.16 to 2.0) | 0.77 (0.40 to 1.5) |
| 61–140 | 0.48 (0.13 to 1.8) | 1.1 (0.61 to 2.0) |
| Ammonia (ppm) | ||
| 0–4.2 | 1 | 1 |
| 4.3–10 | 1.3 (0.39 to 4.1) | 1.6 (0.87 to 2.8) |
| 11–23 | 0.55 (0.12 to 2.4) | 1.9 (0.98 to 3.6) |