Associations of asthma and atopy with individual and farm related factors in a farming population (n = 1614). Associations with asthma are also shown for atopic (n = 264) and non-atopic (n = 1350) individuals separately
| Factor | ORadj of risk factor* (95% CI) | |||
|---|---|---|---|---|
| Asthma (n = 164) | Atopy (n = 264) | Asthma in atopic farmers† (n = 33) | Asthma in non-atopic farmers (n = 131) | |
| *Adjusted by logistic regression. | ||||
| †Only significant potential confounders were included in this model. | ||||
| Age (years) | ||||
| 1–39 | 1 | 1 | 1 | 1 |
| 40–46 | 1.1 (0.52 to 2.2) | 0.82 (0.56 to 1.2) | 0.70 (0.20 to 2.4) | 1.5 (0.59 to 3.6) |
| 47–54 | 2.3 (1.2 to 4.4) | 0.67 (0.44 to 1.0) | 1.7 (0.62 to 4.8) | 3.2 (1.4 to 7.1) |
| 55–69 | 5.2 (2.6 to 11) | 0.73 (0.43 to 1.2) | 2.9 (1.1 to 7.8) | 8.2 (3.4 to 20) |
| Sex | ||||
| Male | 1 | 1 | 1 | |
| Female | 0.82 (0.54 to 1.3) | 0.81 (0.58 to 1.1) | – | 0.89 (0.56 to 1.4) |
| Smoking | ||||
| Never | 1 | 1 | 1 | |
| Former | 1.2 (0.74 to 1.8) | 0.57 (0.39 to 0.85) | – | 1.0 (0.64 to 1.7) |
| Current | 1.0 (0.70 to 1.6) | 0.61 (0.45 to 0.83) | 1.2 (0.74 to 1.8) | |
| Asthma in family | ||||
| No | 1 | 1 | 1 | 1 |
| Yes | 2.4 (1.7 to 3.5) | 1.3 (0.91 to 1.7) | 2.9 (1.3 to 6.2) | 2.4 (1.6 to 3.5) |
| Years of farm work | ||||
| 0–13 | 1 | 1 | 1 | |
| 14–20 | 1.4 (0.80 to 2.6) | 0.87 (0.61 to 1.2) | 1.9 (0.90 to 3.9) | |
| 21–31 | 1.0 (0.53 to 1.9) | 0.73 (0.49 to 1.1) | – | 1.1 (0.52 to 2.5) |
| 32–64 | 1.3 (0.67 to 2.7) | 0.39 (0.21 to 0.71) | 1.5 (0.67 to 3.5) | |
| Farm work | ||||
| Part time | 1 | 1 | 1 | |
| Full time | 0.78 (0.54 to 1.1) | 1.0 (0.74 to 1.3) | – | 0.75 (0.49 to 1.1) |
| Farm production | ||||
| Crop | 1 | 1 | 1 | 1 |
| Livestock (1 type) | 1.1 (0.68 to 1.7) | 0.81 (0.57 to 1.2) | 0.75 (0.32 to 1.8) | 1.2 (0.73 to 2.2) |
| Livestock (⩾ 2 types) | 1.4 (0.84 to 2.2) | 0.91 (0.62 to 1.3) | 0.32 (0.11 to 0.97) | 1.9 (1.1 to 3.3) |